2
0
mirror of https://github.com/fhem/fhem-mirror.git synced 2025-03-04 23:46:35 +00:00
fhem-mirror/fhem/FHEM/21_OWAD.pm

1525 lines
49 KiB
Perl

########################################################################################
#
# OWAD.pm
#
# FHEM module to commmunicate with 1-Wire A/D converters DS2450
#
# Prof. Dr. Peter A. Henning, 2012
#
# $Id$
#
########################################################################################
#
# define <name> OWAD [<model>] <ROM_ID> [interval] or or OWAD <FAM_ID>.<ROM_ID> [interval]
#
# where <name> may be replaced by any name string
#
# <model> is a 1-Wire device type. If omitted, we assume this to be an
# DS2450 A/D converter
# <FAM_ID> is a 1-Wire family id, currently allowed value is 20
# <ROM_ID> is a 12 character (6 byte) 1-Wire ROM ID
# without Family ID, e.g. A2D90D000800
# [interval] is an optional query interval in seconds
#
# get <name> id => FAM_ID.ROM_ID.CRC
# get <name> present => 1 if device present, 0 if not
# get <name> interval => query interval
# get <name> reading => measurement for all channels
# get <name> alarm => alarm measurement settings for all channels
# get <name> status => alarm and i/o status for all channels
# get <name> version => OWX version number
#
# set <name> interval => set period for measurement
#
# Additional attributes are defined in fhem.cfg, in some cases per channel, where <channel>=A,B,C,D
#
# attr <name> stateAL0 "<string>" = character string for denoting low normal condition, default is empty
# attr <name> stateAH0 "<string>" = character string for denoting high normal condition, default is empty
# attr <name> stateAL1 "<string>" = character string for denoting low alarm condition, default is down triangle
# attr <name> stateAH1 "<string>" = character string for denoting high alarm condition, default is up triangle
# attr <name> <channel>Name <string>|<string> = name for the channel | a type description for the measured value
# attr <name> <channel>Unit <string>|<string> = unit of measurement for this channel | its abbreviation
#
# ATTENTION: Usage of Offset/Factor is deprecated, replace by Function attribute
# attr <name> <channel>Offset <float> = offset added to the reading in this channel
# attr <name> <channel>Factor <float> = factor multiplied to (reading+offset) in this channel
# attr <name> <channel>Function <string> = arbitrary functional expression involving the values V<channel>=VA,VB,VC,VD
# VA is replaced by the measured voltage in channel A, etc.
#
# attr <name> <channel>Alarm <string> = alarm setting in this channel, either both, low, high or none (default)
# attr <name> <channel>Low <float> = measurement value (on the scale determined by offset and factor) for low alarm
# attr <name> <channel>High <float> = measurement value (on the scale determined by offset and factor) for high alarm
#
########################################################################################
#
# This programm is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# The GNU General Public License can be found at
# http://www.gnu.org/copyleft/gpl.html.
# A copy is found in the textfile GPL.txt and important notices to the license
# from the author is found in LICENSE.txt distributed with these scripts.
#
# This script is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
########################################################################################
package main;
use vars qw{%attr %defs};
use strict;
use warnings;
sub Log($$);
my $owx_version="3.23";
#-- fixed raw channel name, flexible channel name
my @owg_fixed = ("A","B","C","D");
my @owg_channel = ("A","B","C","D");
#-- value globals
my @owg_status;
my $owg_state;
#-- channel values - always the raw values from the device
my @owg_val=("","","","");
#-- channel mode - fixed for now
my @owg_mode = ("input","input","input","input");
#-- resolution in bit - fixed for now
my @owg_resoln = (16,16,16,16);
#-- raw range in mV - fixed for now
my @owg_range = (5100,5100,5100,5100);
#-- alarm status 0 = disabled, 1 = enabled, but not alarmed, 2 = alarmed
my @owg_slow=(0,0,0,0);
my @owg_shigh=(0,0,0,0);
#-- alarm values - always the raw values committed to the device
my @owg_vlow;
my @owg_vhigh;
my %gets = (
"id" => "",
"present" => "",
"interval" => "",
"reading" => "",
"alarm" => "",
"status" => "",
"version" => ""
);
my %sets = (
"interval" => "",
"AAlarm" => "",
"ALow" => "",
"AHigh" => "",
"BAlarm" => "",
"BLow" => "",
"BHigh" => "",
"CAlarm" => "",
"CLow" => "",
"CHigh" => "",
"DAlarm" => "",
"DLow" => "",
"DHigh" => ""
);
my %updates = (
"present" => "",
"reading" => "",
"alarm" => "",
"status" => ""
);
########################################################################################
#
# The following subroutines are independent of the bus interface
#
# Prefix = OWAD
#
########################################################################################
#
# OWAD_Initialize
#
# Parameter hash = hash of device addressed
#
########################################################################################
sub OWAD_Initialize ($) {
my ($hash) = @_;
$hash->{DefFn} = "OWAD_Define";
$hash->{UndefFn} = "OWAD_Undef";
$hash->{GetFn} = "OWAD_Get";
$hash->{SetFn} = "OWAD_Set";
$hash->{AttrFn} = "OWAD_Attr";
my $attlist = "IODev do_not_notify:0,1 showtime:0,1 model:DS2450 loglevel:0,1,2,3,4,5 ".
"stateAL0 stateAL1 stateAH0 stateAH1 ".
$readingFnAttributes;
for( my $i=0;$i<int(@owg_fixed);$i++ ){
$attlist .= " ".$owg_fixed[$i]."Name";
$attlist .= " ".$owg_fixed[$i]."Offset";
$attlist .= " ".$owg_fixed[$i]."Factor";
$attlist .= " ".$owg_fixed[$i]."Function";
$attlist .= " ".$owg_fixed[$i]."Unit";
$attlist .= " ".$owg_fixed[$i]."Alarm:none,low,high,both";
$attlist .= " ".$owg_fixed[$i]."Low";
$attlist .= " ".$owg_fixed[$i]."High";
}
$hash->{AttrList} = $attlist;
}
#########################################################################################
#
# OWAD_Define - Implements DefFn function
#
# Parameter hash = hash of device addressed, def = definition string
#
#########################################################################################
sub OWAD_Define ($$) {
my ($hash, $def) = @_;
my @a = split("[ \t][ \t]*", $def);
my ($name,$model,$fam,$id,$crc,$interval,$scale,$ret);
#-- default
$name = $a[0];
$interval = 300;
$scale = "";
$ret = "";
#-- check syntax
return "OWAD: Wrong syntax, must be define <name> OWAD [<model>] <id> [interval] or OWAD <fam>.<id> [interval]"
if(int(@a) < 2 || int(@a) > 5);
#-- different types of definition allowed
my $a2 = $a[2];
my $a3 = defined($a[3]) ? $a[3] : "";
#-- no model, 12 characters
if( $a2 =~ m/^[0-9|a-f|A-F]{12}$/ ) {
$model = "DS2450";
$fam = "20";
$id = $a[2];
if(int(@a)>=4) { $interval = $a[3]; }
#-- no model, 2+12 characters
} elsif( $a2 =~ m/^[0-9|a-f|A-F]{2}\.[0-9|a-f|A-F]{12}$/ ) {
$fam = substr($a[2],0,2);
$id = substr($a[2],3);
if(int(@a)>=4) { $interval = $a[3]; }
if( $fam eq "20" ){
$model = "DS2450";
CommandAttr (undef,"$name model DS2450");
}else{
return "OWAD: Wrong 1-Wire device family $fam";
}
#-- model, 12 characters
} elsif( $a3 =~ m/^[0-9|a-f|A-F]{12}$/ ) {
$model = $a[2];
$id = $a[3];
if(int(@a)>=5) { $interval = $a[4]; }
if( $model eq "DS2450" ){
$fam = "20";
CommandAttr (undef,"$name model DS2450");
}else{
return "OWAD: Wrong 1-Wire device model $model";
}
} else {
return "OWAD: $a[0] ID $a[2] invalid, specify a 12 or 2.12 digit value";
}
#-- determine CRC Code
$crc = defined($hash->{IODev}->{INTERFACE}) ? sprintf("%02x",OWX_CRC($fam.".".$id."00")) : "00";
#-- Define device internals
$hash->{ROM_ID} = $fam.".".$id.$crc;
$hash->{OW_ID} = $id;
$hash->{OW_FAMILY} = $fam;
$hash->{PRESENT} = 0;
$hash->{INTERVAL} = $interval;
$hash->{ERRCOUNT} = 0;
#-- Couple to I/O device
AssignIoPort($hash);
## | !defined($hash->{IODev}->{PRESENT})
if( !defined($hash->{IODev}->{NAME}) | !defined($hash->{IODev}) ){
return "OWAD: Warning, no 1-Wire I/O device found for $name.";
}
#if( $hash->{IODev}->{PRESENT} != 1 ){
# return "OWAD: Warning, 1-Wire I/O device ".$hash->{IODev}->{NAME}." not present for $name.";
#}
$modules{OWAD}{defptr}{$id} = $hash;
#--
readingsSingleUpdate($hash,"state","defined",1);
Log 3, "OWAD: Device $name defined.";
#-- Initialization reading according to interface type
my $interface= $hash->{IODev}->{TYPE};
#-- Start timer for updates
InternalTimer(time()+60, "OWAD_GetValues", $hash, 0);
return undef;
}
#######################################################################################
#
# OWAD_Attr - Set one attribute value for device
#
# Parameter hash = hash of device addressed
# a = argument array
#
########################################################################################
sub OWAD_Attr(@) {
my ($do,@a) = @_;
my $name = $a[0];
my $key = $a[1];
my $ret;
#-- only alarm settings may be modified at runtime for now
return undef
if( $key !~ m/(.*)(Alarm|Low|High)/ );
#-- safeguard against uninitialized devices
return undef
if( $main::defs{$name}->{READINGS}{"state"}{VAL} eq "defined" );
if( $do eq "set")
{
$ret = OWAD_Set($main::defs{$name},@a);
} elsif( $do eq "del"){
if( $key =~ m/(.*)(Alarm)/ ){
}
}
return $ret;
}
########################################################################################
#
# OWAD_ChannelNames - find the real channel names
#
# Parameter hash = hash of device addressed
#
########################################################################################
sub OWAD_ChannelNames($) {
my ($hash) = @_;
my $name = $hash->{NAME};
my $state = $hash->{READINGS}{"state"}{VAL};
my ($cname,@cnama,$unit,@unarr);
for (my $i=0;$i<int(@owg_fixed);$i++){
#-- name
$cname = defined($attr{$name}{$owg_fixed[$i]."Name"}) ? $attr{$name}{$owg_fixed[$i]."Name"} : $owg_fixed[$i]."|voltage";
@cnama = split(/\|/,$cname);
if( int(@cnama)!=2){
Log 1, "OWAD: Incomplete channel name specification $cname. Better use $cname|<type of data>"
if( $state eq "defined");
push(@cnama,"unknown");
}
$owg_channel[$i]=$cnama[0];
#-- unit
$unit = defined($attr{$name}{$owg_fixed[$i]."Unit"}) ? $attr{$name}{$owg_fixed[$i]."Unit"} : "Volt|V";
@unarr= split(/\|/,$unit);
if( int(@unarr)!=2 ){
Log 1, "OWAD: Incomplete channel unit specification $unit. Better use $unit|<abbreviation>"
if( $state eq "defined");
push(@unarr,"");
}
#-- put into readings
$hash->{READINGS}{$owg_channel[$i]}{TYPE} = $cnama[1];
$hash->{READINGS}{$owg_channel[$i]}{UNIT} = $unarr[0];
$hash->{READINGS}{$owg_channel[$i]}{UNITABBR} = $unarr[1];
}
}
########################################################################################
#
# OWAD_FormatValues - put together various format strings
#
# Parameter hash = hash of device addressed, fs = format string
#
########################################################################################
sub OWAD_FormatValues($) {
my ($hash) = @_;
my $name = $hash->{NAME};
my $interface = $hash->{IODev}->{TYPE};
my ($offset,$factor,$vval,$vlow,$vhigh,$vfunc,$ret);
my $vfuncall = "";
my $svalue = "";
#-- insert initial values
for( my $k=0;$k<int(@owg_fixed);$k++ ){
$vfuncall .= "\$owg_val[$k]=$owg_val[$k];";
}
my $alarm;
my $galarm = 0;
my $achange = 0;
my $schange = 0;
$hash->{ALARM} = 0;
#-- alarm signatures
my $stateal1 = defined($attr{$name}{stateAL1}) ? $attr{$name}{stateAL1} : "&#x25BE;";
my $stateah1 = defined($attr{$name}{stateAH1}) ? $attr{$name}{stateAH1} : "&#x25B4;";
my $stateal0 = defined($attr{$name}{stateAL0}) ? $attr{$name}{stateAL0} : "";
my $stateah0 = defined($attr{$name}{stateAH0}) ? $attr{$name}{stateAH0} : "";
#-- no change in any value if invalid reading
for (my $i=0;$i<int(@owg_fixed);$i++){
return if( ($owg_val[$i] eq "") || (!defined($owg_val[$i])) );
}
#-- obtain channel names
OWAD_ChannelNames($hash);
#-- put into READINGS
readingsBeginUpdate($hash);
#-- formats for output
for (my $i=0;$i<int(@owg_fixed);$i++){
#-- when offset and scale factor are defined, we cannot have a function and vice versa
if( defined($attr{$name}{$owg_fixed[$i]."Offset"}) && defined($attr{$name}{$owg_fixed[$i]."Factor"}) ){
my $offset = $attr{$name}{$owg_fixed[$i]."Offset"};
my $factor = $attr{$name}{$owg_fixed[$i]."Factor"};
$vfunc = "$factor*(V$owg_fixed[$i] + $offset)";
#-- attribute VFunction defined
} elsif (defined($attr{$name}{$owg_fixed[$i]."Function"})){
$vfunc = $attr{$name}{$owg_fixed[$i]."Function"};
} else {
$vfunc = "V$owg_fixed[$i]";
}
$hash->{tempf}{$owg_fixed[$i]}{function} = $vfunc;
#-- replace by proper values (VA -> $owg_val[0] etc.)
# careful: how to prevent {VAL} from being replaced ?
for( my $k=0;$k<int(@owg_fixed);$k++ ){
my $sstr = "V$owg_fixed[$k]";
$vfunc =~ s/VAL/WERT/g;
$vfunc =~ s/$sstr/\$owg_val[$k]/g;
$vfunc =~ s/WERT/VAL/g;
}
#-- determine the measured value from the function
$vfunc = $vfuncall.$vfunc;
$vfunc = eval($vfunc);
if( !$vfunc ){
$vval = 0.0;
} elsif( $vfunc ne "" ){
$vval = int( $vfunc*1000 )/1000;
} else {
$vval = "???";
}
#-- low alarm value
$vlow =$owg_vlow[$i];
$main::attr{$name}{$owg_fixed[$i]."Low"}=$vlow;
#-- high alarm value
$vhigh=$owg_vhigh[$i];
$main::attr{$name}{$owg_fixed[$i]."High"}=$vhigh;
#-- string buildup for return value, STATE and alarm
$svalue .= sprintf( "%s: %5.3f %s", $owg_channel[$i], $vval,$hash->{READINGS}{$owg_channel[$i]}{UNITABBR});
#-- Test for alarm condition
$alarm = "none";
#-- alarm signature low
if( $owg_slow[$i] == 0 ) {
} else {
$alarm="low";
if( $vval > $vlow ){
$owg_slow[$i] = 1;
$svalue .= $stateal0;
} else {
$galarm = 1;
$owg_slow[$i] = 2;
$svalue .= $stateal1;
}
}
#-- alarm signature high
if( $owg_shigh[$i] == 0 ) {
} else {
if( $alarm eq "low") {
$alarm="both";
}else{
$alarm="high";
}
if( $vval < $vhigh ){
$owg_shigh[$i] = 1;
$svalue .= $stateah0;
} else {
$galarm = 1;
$owg_shigh[$i] = 2;
$svalue .= $stateah1;
}
}
#-- put into READINGS
readingsBulkUpdate($hash,"$owg_channel[$i]",$vval);
#-- insert space
if( $i<int(@owg_fixed)-1 ){
$svalue .= " ";
}
}
#-- STATE
readingsBulkUpdate($hash,"state",$svalue);
readingsEndUpdate($hash,1);
$hash->{ALARM} = 1
if( $galarm == 1);
return $svalue;
}
########################################################################################
#
# OWAD_Get - Implements GetFn function
#
# Parameter hash = hash of device addressed, a = argument array
#
########################################################################################
sub OWAD_Get($@) {
my ($hash, @a) = @_;
my $reading = $a[1];
my $name = $hash->{NAME};
my $model = $hash->{OW_MODEL};
my $interface= $hash->{IODev}->{TYPE};
my ($value,$value2,$value3) = (undef,undef,undef);
my $ret = "";
my $offset;
my $factor;
#-- check syntax
return "OWAD: Get argument is missing @a"
if(int(@a) != 2);
#-- check argument
return "OWAD: Get with unknown argument $a[1], choose one of ".join(",", sort keys %gets)
if(!defined($gets{$a[1]}));
#-- get id
if($a[1] eq "id") {
$value = $hash->{ROM_ID};
return "$name.id => $value";
}
#-- get present
if($a[1] eq "present") {
#-- hash of the busmaster
my $master = $hash->{IODev};
$value = OWX_Verify($master,$hash->{ROM_ID});
$hash->{PRESENT} = $value;
return "$name.present => $value";
}
#-- get interval
if($a[1] eq "interval") {
$value = $hash->{INTERVAL};
return "$name.interval => $value";
}
#-- get version
if( $a[1] eq "version") {
return "$name.version => $owx_version";
}
#-- reset presence
$hash->{PRESENT} = 0;
#-- get reading according to interface type
if($a[1] eq "reading") {
#-- OWX interface
if( $interface eq "OWX" ){
$ret = OWXAD_GetPage($hash,"reading");
#-- OWFS interface
}elsif( $interface eq "OWServer" ){
$ret = OWFSAD_GetPage($hash,"reading");
#-- Unknown interface
}else{
return "OWAD: Get with wrong IODev type $interface";
}
#-- process results
if( defined($ret) ){
$hash->{ERRCOUNT}=$hash->{ERRCOUNT}+1;
if( $hash->{ERRCOUNT} > 5 ){
$hash->{INTERVAL} = 9999;
}
return "OWAD: Could not get values from device $name for ".$hash->{ERRCOUNT}." times, reason $ret";
}
$hash->{PRESENT} = 1;
return "OWAD: $name.reading => ".OWAD_FormatValues($hash);
}
#-- get alarm values according to interface type
if($a[1] eq "alarm") {
#-- OWX interface
if( $interface eq "OWX" ){
$ret = OWXAD_GetPage($hash,"alarm");
#-- OWFS interface
}elsif( $interface eq "OWServer" ){
$ret = OWFSAD_GetPage($hash,"alarm");
#-- Unknown interface
}else{
return "OWAD: Get with wrong IODev type $interface";
}
#-- process results
if( defined($ret) ){
$hash->{ERRCOUNT}=$hash->{ERRCOUNT}+1;
if( $hash->{ERRCOUNT} > 5 ){
$hash->{INTERVAL} = 9999;
}
return "OWAD: Could not get values from device $name for ".$hash->{ERRCOUNT}." times, reason $ret";
}
$hash->{PRESENT} = 1;
OWAD_FormatValues($hash);
#-- assemble ouput string
$value = "";
for (my $i=0;$i<int(@owg_fixed);$i++){
$value .= sprintf "%s:[%4.2f,%4.2f] ",$owg_channel[$i],
$main::attr{$name}{$owg_channel[$i]."Low"},
$main::attr{$name}{$owg_channel[$i]."High"};
}
return "OWAD: $name.alarm => $value";
}
#-- get status values according to interface type
if($a[1] eq "status") {
#-- OWX interface
if( $interface eq "OWX" ){
$ret = OWXAD_GetPage($hash,"status");
#-- OWFS interface
}elsif( $interface eq "OWServer" ){
$ret = OWFSAD_GetPage($hash,"status");
#-- Unknown interface
}else{
return "OWAD: Get with wrong IODev type $interface";
}
#-- process results
if( defined($ret) ){
$hash->{ERRCOUNT}=$hash->{ERRCOUNT}+1;
if( $hash->{ERRCOUNT} > 5 ){
$hash->{INTERVAL} = 9999;
}
return "OWAD: Could not get values from device $name for ".$hash->{ERRCOUNT}." times, reason $ret";
}
$hash->{PRESENT} = 1;
OWAD_FormatValues($hash);
#-- assemble output string
$value = "\n";
for (my $i=0;$i<int(@owg_fixed);$i++){
$value .= $owg_channel[$i].": ".$owg_mode[$i].", ";
#$value .= "disabled ,"
# if ( !($sb2 && 128) );
$value .= sprintf "raw range %3.1f V, ",$owg_range[$i]/1000;
$value .= sprintf "resolution %d bit, ",$owg_resoln[$i];
$value .= sprintf "low alarm disabled, "
if( $owg_slow[$i]==0 );
$value .= sprintf "low alarm enabled, "
if( $owg_slow[$i]==1 );
$value .= sprintf "alarmed low, "
if( $owg_slow[$i]==2 );
$value .= sprintf "high alarm disabled"
if( $owg_shigh[$i]==0 );
$value .= sprintf "high alarm enabled"
if( $owg_shigh[$i]==1 );
$value .= sprintf "alarmed high"
if( $owg_shigh[$i]==2 );
#-- insert space
if( $i<int(@owg_fixed)-1 ){
$value .= "\n";
}
}
return "OWAD: $name.status => ".$value;
}
}
#######################################################################################
#
# OWAD_GetValues - Updates the reading from one device
#
# Parameter hash = hash of device addressed
#
########################################################################################
sub OWAD_GetValues($) {
my $hash = shift;
my $name = $hash->{NAME};
my $model = $hash->{OW_MODEL};
my $interface= $hash->{IODev}->{TYPE};
my $value = "";
my $ret = "";
my ($ret1,$ret2,$ret3);
#-- check if device needs to be initialized
OWAD_InitializeDevice($hash)
if( $hash->{READINGS}{"state"}{VAL} eq "defined");
#-- define warnings
my $warn = "none";
$hash->{ALARM} = "0";
#-- restart timer for updates
RemoveInternalTimer($hash);
InternalTimer(time()+$hash->{INTERVAL}, "OWAD_GetValues", $hash, 1);
#-- reset presence
$hash->{PRESENT} = 0;
#-- Get readings, alarms and stati according to interface type
if( $interface eq "OWX" ){
#-- max 3 tries
for(my $try=0; $try<3; $try++){
$ret1 = OWXAD_GetPage($hash,"reading");
$ret2 = OWXAD_GetPage($hash,"alarm");
$ret3 = OWXAD_GetPage($hash,"status");
last
if( (!defined($ret)) && (!defined($ret2)) && (!defined($ret3)) );
}
}elsif( $interface eq "OWServer" ){
$ret1 = OWFSAD_GetPage($hash,"reading");
$ret2 = OWFSAD_GetPage($hash,"alarm");
$ret3 = OWFSAD_GetPage($hash,"status");
}else{
return "OWAD: GetValues with wrong IODev type $interface";
}
#-- process results
$ret .= $ret1
if( defined($ret1) );
$ret .= $ret2
if( defined($ret2) );
$ret .= $ret3
if( defined($ret3) );
if( $ret ne "" ){
return "OWAD: Could not get values from device $name, reason $ret";
}
$hash->{PRESENT} = 1;
$value=OWAD_FormatValues($hash);
Log 5, $value;
return undef;
}
########################################################################################
#
# OWAD_InitializeDevice - delayed setting of initial readings and channel names
#
# Parameter hash = hash of device addressed
#
########################################################################################
sub OWAD_InitializeDevice($) {
my ($hash) = @_;
my $name = $hash->{NAME};
my $interface = $hash->{IODev}->{TYPE};
my $ret="";
my ($ret1,$ret2);
#-- Initial readings
@owg_val = ("","","","");
#-- Initial alarm values
for( my $i=0;$i<int(@owg_fixed);$i++) {
$hash->{ERRCOUNT} = 0;
#-- alarm enabling
if( AttrVal($name,$owg_fixed[$i]."Alarm",undef) ){
my $alarm = AttrVal($name,$owg_fixed[$i]."Alarm",undef);
if( $alarm eq "none" ){
$owg_slow[$i]=0;
$owg_shigh[$i]=0;
}elsif( $alarm eq "low" ){
$owg_slow[$i]=1;
$owg_shigh[$i]=0;
}elsif( $alarm eq "high" ){
$owg_slow[$i]=0;
$owg_shigh[$i]=1;
}elsif( $alarm eq "both" ){
$owg_slow[$i]=1;
$owg_shigh[$i]=1;
}
}
#-- low alarm value - no checking for correct parameters
if( AttrVal($name,$owg_fixed[$i]."Low",undef) ){
$owg_vlow[$i] = $main::attr{$name}{$owg_fixed[$i]."Low"};
}
#-- high alarm value
if( AttrVal($name,$owg_fixed[$i]."High",undef) ){
$owg_vhigh[$i] = $main::attr{$name}{$owg_fixed[$i]."High"};
}
Log 1,"+++++++++> Alarm enabling for $name channel $i is $owg_slow[$i] $owg_shigh[$i] $owg_vlow[$i] $owg_vhigh[$i]";
}
#-- resolution in bit - fixed for now
@owg_resoln = (16,16,16,16);
#-- raw range in mV - fixed for now
@owg_range = (5100,5100,5100,5100);
#-- OWX interface
if( $interface eq "OWX" ){
$ret1 = OWXAD_SetPage($hash,"status");
$ret2 = OWXAD_SetPage($hash,"alarm");
#-- OWFS interface
}elsif( $interface eq "OWServer" ){
$ret1 = OWFSAD_SetPage($hash,"status");
$ret2 = OWFSAD_SetPage($hash,"alarm");
}
Log 1,"Status return $ret1 $ret2";
#-- process results
$ret .= $ret1
if( defined($ret1) );
$ret .= $ret2
if( defined($ret2) );
if( $ret ne "" ){
return "OWAD: Could not initialize device $name, reason: ".$ret;
}
#-- Set state to initialized
readingsSingleUpdate($hash,"state","initialized",1);
return undef;
}
#######################################################################################
#
# OWAD_Set - Set one value for device
#
# Parameter hash = hash of device addressed
# a = argument array
#
########################################################################################
sub OWAD_Set($@) {
my ($hash, @a) = @_;
my $key = $a[1];
my $value = $a[2];
#-- for the selector: which values are possible
return join(" ", sort keys %sets) if(@a == 2);
#-- check syntax
return "OWAD: Set needs one parameter when setting this value"
if( int(@a)!=3 );
#-- check argument
if( !defined($sets{$a[1]}) && !($key =~ m/.*(Alarm|Low|High)/) ){
return "OWAD: Set with unknown argument $a[1]";
}
#-- define vars
my $ret = undef;
my $channon = undef;
my $channo = undef;
my $factor;
my $offset;
my $condx;
my $name = $hash->{NAME};
my $model = $hash->{OW_MODEL};
#-- set new timer interval
if($key eq "interval") {
# check value
return "OWAD: Set with short interval, must be > 1"
if(int($value) < 1);
# update timer
$hash->{INTERVAL} = $value;
RemoveInternalTimer($hash);
InternalTimer(gettimeofday()+$hash->{INTERVAL}, "OWAD_GetValues", $hash, 1);
return undef;
}
#-- find out which channel we have
my $tc =$key;
if( $tc =~ s/(.*)(Alarm|Low|High)/$channon=$1/se ) {
for (my $i=0;$i<int(@owg_fixed);$i++){
if( $tc eq $owg_fixed[$i] ){
$channo = $i;
$channon = $tc;
last;
}
}
}
return "OWAD: Cannot determine channel from parameter $a[1]"
if( !(defined($channo)));
#-- set these values depending on interface type
my $interface= $hash->{IODev}->{TYPE};
#-- set status values (alarm on or off)
if( $key =~ m/(.*)(Alarm)/ ) {
return "OWAD: Set with wrong value $value for $key, allowed is none/low/high/both"
if($value ne "none" && $value ne "low" && $value ne "high" && $value ne "both");
#-- put into attribute value
if( $main::attr{$name}{$owg_fixed[$channo]."Alarm"} ne $value ){
#Log 1,"OWAD: Correcting attribute value ".$owg_fixed[$channo]."Alarm";
$main::attr{$name}{$owg_fixed[$channo]."Alarm"} = $value
}
#-- put into device
if( $value eq "low" || $value eq "both" ){
$owg_slow[$channo]=1;
} else{
$owg_slow[$channo]=0;
}
if( $value eq "high" || $value eq "both" ){
$owg_shigh[$channo]=1;
} else{
$owg_shigh[$channo]=0;
}
#-- OWX interface
if( $interface eq "OWX" ){
$ret = OWXAD_SetPage($hash,"status");
#-- OWFS interface
}elsif( $interface eq "OWServer" ){
$ret = OWFSAD_SetPage($hash,"status");
} else {
return "OWAD: Set with wrong IODev type $interface";
}
#-- process results
if( defined($ret) ){
return "OWAD: Could not set device $name, reason: ".$ret;
}
#-- set alarm values (alarm voltages)
}elsif( $key =~ m/(.*)(Low|High)/ ) {
#-- find upper and lower boundaries for given offset/factor
my $mmin = 0.0;
my $mmax = $owg_range[$channo]/1000;
return sprintf("OWAD: Set with wrong value $value for $key, range is [%3.1f,%3.1f]",$mmin,$mmax)
if($value < $mmin || $value > $mmax);
#-- round to those numbers understood by the device
my $value2 = int($value*255000/$owg_range[$channo])*$owg_range[$channo]/255000;
if( $key =~ m/(.*)Low/ ){
#-- put into attribute value
if( $main::attr{$name}{$owg_fixed[$channo]."Low"} != $value2 ){
Log 1,"OWAD: Correcting attribute value ".$owg_fixed[$channo]."Low";
$main::attr{$name}{$owg_fixed[$channo]."Low"} = $value2
}
#-- put into device
$owg_vlow[$channo] = $value2;
} elsif( $key =~ m/(.*)High/ ){
#-- put into attribute value
if( $main::attr{$name}{$owg_fixed[$channo]."High"} != $value2 ){
Log 1,"OWAD: Correcting attribute value ".$owg_fixed[$channo]."High";
$main::attr{$name}{$owg_fixed[$channo]."High"} = $value2
}
#-- put into device
$owg_vhigh[$channo] = $value2;
}
#-- OWX interface
if( $interface eq "OWX" ){
$ret = OWXAD_SetPage($hash,"alarm");
#-- OWFS interface
}elsif( $interface eq "OWServer" ){
$ret = OWFSAD_SetPage($hash,"alarm");
} else {
return "OWAD: Set with wrong IODev type $interface";
}
#-- process results
if( defined($ret) ){
return "OWAD: Could not set device $name, reason: ".$ret;
}
}
#-- process results - we have to reread the device
$hash->{PRESENT} = 1;
OWAD_GetValues($hash);
OWAD_FormatValues($hash);
Log 4, "OWAD: Set $hash->{NAME} $key $value";
return undef;
}
########################################################################################
#
# OWAD_Undef - Implements UndefFn function
#
# Parameter hash = hash of device addressed
#
########################################################################################
sub OWAD_Undef ($) {
my ($hash) = @_;
delete($modules{OWAD}{defptr}{$hash->{OW_ID}});
RemoveInternalTimer($hash);
return undef;
}
########################################################################################
#
# The following subroutines in alphabetical order are only for a 1-Wire bus connected
# via OWFS
#
# Prefix = OWFSAD
#
########################################################################################
#
# OWFSAD_GetPage - Get one memory page from device
#
# Parameter hash = hash of device addressed
# page = "reading", "alarm" or "status"
#
########################################################################################
sub OWFSAD_GetPage($$) {
my ($hash,$page) = @_;
#-- ID of the device
my $owx_add = substr($hash->{ROM_ID},0,15);
#-- hash of the busmaster
my $master = $hash->{IODev};
my $name = $hash->{NAME};
my ($rel,$rel2,@ral,@ral2,$i,$an,$vn);
#=============== get the voltage reading ===============================
if( $page eq "reading"){
#-- get values - or should we rather use the uncached ones ?
$rel = OWServer_Read($master,"/$owx_add/volt.ALL");
return "no return from OWServer"
if( !defined($rel) );
return "empty return from OWServer"
if( $rel eq "" );
@ral = split(/,/,$rel);
return "wrong data length from OWServer"
if( int(@ral) != 4);
for( $i=0;$i<int(@owg_fixed);$i++){
$owg_val[$i]= int($ral[$i]*1000)/1000;
}
#=============== get the alarm reading ===============================
} elsif ( $page eq "alarm" ) {
#-- get values - or should we rather use the uncached ones ?
$rel = OWServer_Read($master,"/$owx_add/set_alarm/voltlow.ALL");
$rel2 = OWServer_Read($master,"/$owx_add/set_alarm/volthigh.ALL");
return "no return from OWServer"
if( (!defined($rel)) || (!defined($rel2)) );
return "empty return from OWServer"
if( ($rel eq "") || ($rel2 eq "") );
@ral = split(/,/,$rel);
@ral2= split(/,/,$rel2);
return "wrong data length from OWServer"
if( (int(@ral) != 4) || (int(@ral2) != 4) );
for( $i=0;$i<int(@owg_fixed);$i++){
$owg_vlow[$i] = int($ral[$i]*1000)/1000;
$owg_vhigh[$i] = int($ral2[$i]*1000)/1000;
}
#=============== get the status reading ===============================
} elsif ( $page eq "status" ) {
#-- so far not clear, how to find out which type of operation we have.
# We therefore ASSUME normal operation
#-- normal operation
#-- put into globals
for( $i=0;$i<int(@owg_fixed);$i++){
$owg_mode[$i] = "input";
$owg_resoln[$i] = 16;
$owg_range[$i] = 5100;
}
#-- get values - or should we rather use the uncached ones ?
$rel = OWServer_Read($master,"/$owx_add/alarm/low.ALL");
$rel2 = OWServer_Read($master,"/$owx_add/set_alarm/low.ALL");
return "no return from OWServer"
if( (!defined($rel)) || (!defined($rel2)) );
return "empty return from OWServer"
if( ($rel eq "") || ($rel2 eq "") );
@ral = split(/,/,$rel);
@ral2= split(/,/,$rel2);
return "wrong data length from OWServer"
if( (int(@ral) != 4) || (int(@ral2) != 4) );
for( $i=0;$i<int(@owg_fixed);$i++){
#-- low alarm disabled
if( $ral2[$i]==0 ){
$an = 0;
}else {
#-- low alarm enabled and not set
if ( $ral[$i]==0 ){
$an = 1;
#-- low alarm enabled and set
}else{
$an = 2;
}
}
$owg_slow[$i] = $an;
}
#-- get values - or should we rather use the uncached ones ?
$rel = OWServer_Read($master,"/$owx_add/alarm/high.ALL");
$rel2 = OWServer_Read($master,"/$owx_add/set_alarm/high.ALL");
return "no return from OWServer"
if( (!defined($rel)) || (!defined($rel2)) );
return "empty return from OWServer"
if( ($rel eq "") || ($rel2 eq "") );
@ral = split(/,/,$rel);
@ral2= split(/,/,$rel2);
return "wrong data length from OWServer"
if( (int(@ral) != 4) || (int(@ral2) != 4) );
for( $i=0;$i<int(@owg_fixed);$i++){
#-- low alarm disabled
if( $ral2[$i]==0 ){
$an = 0;
}else {
#-- low alarm enabled and not set
if ( $ral[$i]==0 ){
$an = 1;
#-- low alarm enabled and set
}else{
$an = 2;
}
}
$owg_shigh[$i] = $an;
}
}
return undef
}
########################################################################################
#
# OWFSAD_SetPage - Set one page of device
#
# Parameter hash = hash of device addressed
# page = "alarm" or "status"
#
########################################################################################
sub OWFSAD_SetPage($$) {
my ($hash,$page) = @_;
#-- ID of the device
my $owx_add = substr($hash->{ROM_ID},0,15);
#-- hash of the busmaster
my $master = $hash->{IODev};
my $name = $hash->{NAME};
my $i;
my @ral=(0,0,0,0);
my @ral2=(0,0,0,0);
#=============== set the alarm values ===============================
if ( $page eq "alarm" ) {
OWServer_Write($master, "/$owx_add/set_alarm/voltlow.ALL",join(',',@owg_vlow));
OWServer_Write($master, "/$owx_add/set_alarm/volthigh.ALL",join(',',@owg_vhigh));
#=============== set the status ===============================
} elsif ( $page eq "status" ) {
for( $i=0;$i<int(@owg_fixed);$i++){
if( $owg_mode[$i] eq "input" ){
#-- resolution (TODO: check !)
#
#-- alarm enabled
if( defined($owg_slow[$i]) ){
$ral[$i]=1
if($owg_slow[$i]>0);
}
if( defined($owg_shigh[$i]) ){
$ral2[$i]=1
if($owg_shigh[$i]>0);
}
}
}
OWServer_Write($master, "/$owx_add/set_alarm/low.ALL",join(',',@ral));
OWServer_Write($master, "/$owx_add/set_alarm/high.ALL",join(',',@ral2));
#=============== wrong page write attempt ===============================
} else {
return "wrong memory page write attempt";
}
return undef;
}
########################################################################################
#
# The following subroutines in alphabetical order are only for a 1-Wire bus connected
# directly to the FHEM server
#
# Prefix = OWXAD
#
########################################################################################
#
# OWXAD_GetPage - Get one memory page from device
#
# Parameter hash = hash of device addressed
# page = "reading", "alarm" or "status"
#
########################################################################################
sub OWXAD_GetPage($$) {
my ($hash,$page) = @_;
my ($select, $res, $res2, $res3, @data, $an, $vn);
#-- ID of the device, hash of the busmaster
my $owx_dev = $hash->{ROM_ID};
my $master = $hash->{IODev};
my ($i,$j,$k);
#=============== get the voltage reading ===============================
if( $page eq "reading") {
OWX_Reset($master);
#-- issue the match ROM command \x55 and the start conversion command
$res= OWX_Complex($master,$owx_dev,"\x3C\x0F\x00\xFF\xFF",0);
if( $res eq 0 ){
return "not accessible for conversion";
}
#-- conversion needs some 5 ms per channel
select(undef,undef,undef,0.02);
#-- issue the match ROM command \x55 and the read conversion page command
# \xAA\x00\x00
$select="\xAA\x00\x00";
#=============== get the alarm reading ===============================
} elsif ( $page eq "alarm" ) {
#-- issue the match ROM command \x55 and the read alarm page command
# \xAA\x10\x00
$select="\xAA\x10\x00";
#=============== get the status reading ===============================
} elsif ( $page eq "status" ) {
#-- issue the match ROM command \x55 and the read status memory page command
# \xAA\x08\x00 r
$select="\xAA\x08\x00";
#=============== wrong value requested ===============================
} else {
return "wrong memory page requested";
}
#-- reset the bus
OWX_Reset($master);
#-- reading 9 + 3 + 8 data bytes and 2 CRC bytes = 22 bytes
$res=OWX_Complex($master,$owx_dev,$select,10);
if( $res eq 0 ){
return "not accessible in reading $page page";
}
#-- reset the bus
OWX_Reset($master);
#-- process results
@data=split(//,substr($res,9));
return "invalid data length, ".int(@data)." instead of 13 bytes"
if (@data != 13);
#return "invalid data"
# if (ord($data[17])<=0);
return "invalid CRC"
if (OWX_CRC16(substr($res,9,11),$data[11],$data[12])==0);
#=============== get the voltage reading ===============================
if( $page eq "reading"){
for( $i=0;$i<int(@owg_fixed);$i++){
$owg_val[$i]= int((ord($data[3+2*$i])+256*ord($data[4+2*$i]))/((1<<$owg_resoln[$i])-1) * $owg_range[$i])/1000;
}
#=============== get the alarm reading ===============================
} elsif ( $page eq "alarm" ) {
for( $i=0;$i<int(@owg_fixed);$i++){
$owg_vlow[$i] = int(ord($data[3+2*$i])/255 * $owg_range[$i])/1000;
$owg_vhigh[$i] = int(ord($data[4+2*$i])/255 * $owg_range[$i])/1000;
}
#=============== get the status reading ===============================
} elsif ( $page eq "status" ) {
my ($sb1,$sb2);
for( $i=0;$i<int(@owg_fixed);$i++){
$sb1 = ord($data[3+2*$i]);
$sb2 = ord($data[3+2*$i+1]);
#-- normal operation
if( $sb1 && 128) {
#-- put into globals
$owg_mode[$i] = "input";
$owg_resoln[$i] = ($sb1 & 15);
$owg_resoln[$i] = 16
if ($owg_resoln[$i] == 0);
$owg_range[$i] = ($sb2 & 1) ? 5100 : 2550;
#-- low alarm disabled
if( ($sb2 & 4)==0 ){
$an = 0;
}else {
#-- low alarm enabled and not set
if ( ($sb2 & 16)==0 ){
$an = 1;
#-- low alarm enabled and set
}else{
$an = 2;
}
}
$owg_slow[$i]= $an;
#-- high alarm disabled
if( ($sb2 & 8)==0 ){
$an = 0;
}else {
#-- high alarm enabled and not set
if ( ($sb2 & 32)==0 ){
$an = 1;
#-- high alarm enabled and set
}else{
$an = 2;
}
}
$owg_shigh[$i]= $an;
#-- output operation
} else {
$owg_mode[$i] = "output";
#-- assemble status string
$owg_status[$i] = $owg_mode[$i].", ";
$owg_status[$i] .= ($sb1 & 64 ) ? "ON" : "OFF";
}
}
}
return undef
}
########################################################################################
#
# OWXAD_SetPage - Set one page of device
#
# Parameter hash = hash of device addressed
# page = "alarm" or "status"
#
########################################################################################
sub OWXAD_SetPage($$) {
my ($hash,$page) = @_;
my ($select, $res, $res2, $res3, @data);
#-- ID of the device, hash of the busmaster
my $owx_dev = $hash->{ROM_ID};
my $master = $hash->{IODev};
my ($i,$j,$k);
#=============== set the alarm values ===============================
if ( $page eq "alarm" ) {
#-- issue the match ROM command \x55 and the set alarm page command
# \x55\x10\x00 reading 8 data bytes and 2 CRC bytes
$select="\x55\x10\x00";
for( $i=0;$i<int(@owg_fixed);$i++){
$select .= sprintf "%c\xFF\xFF\xFF",int($owg_vlow[$i]*255000/$owg_range[$i]);
$select .= sprintf "%c\xFF\xFF\xFF",int($owg_vhigh[$i]*255000/$owg_range[$i]);
}
#=============== set the status ===============================
} elsif ( $page eq "status" ) {
my ($sb1,$sb2)=(0,0);
#-- issue the match ROM command \x55 and the set status memory page command
# \x55\x08\x00 reading 8 data bytes and 2 CRC bytes
$select="\x55\x08\x00";
for( $i=0;$i<int(@owg_fixed);$i++){
#if( $owg_mode[$i] eq "input" ){
if( 1 > 0){
#-- resolution (TODO: check !)
$sb1 = $owg_resoln[$i] & 15;
#-- alarm enabled
if( defined($owg_slow[$i]) ){
$sb2 = ( $owg_slow[$i] ne 0 ) ? 4 : 0;
}
if( defined($owg_shigh[$i]) ){
$sb2 += ( $owg_shigh[$i] ne 0 ) ? 8 : 0;
}
#-- range
$sb2 |= 1
if( $owg_range[$i] > 2550 );
} else {
$sb1 = 128;
$sb2 = 0;
}
$select .= sprintf "%c\xFF\xFF\xFF",$sb1;
$select .= sprintf "%c\xFF\xFF\xFF",$sb2;
}
#=============== wrong page write attempt ===============================
} else {
return "wrong memory page write attempt";
}
OWX_Reset($master);
$res=OWX_Complex($master,$owx_dev,$select,0);
#-- process results
if( $res eq 0 ){
return "device $owx_dev not accessible for writing";
}
return undef;
}
1;
=pod
=begin html
<a name="OWAD"></a>
<h3>OWAD</h3>
<p>FHEM module to commmunicate with 1-Wire A/D converters<br /><br />
<br />This 1-Wire module works with the OWX interface module or with the OWServer interface module
(prerequisite: Add this module's name to the list of clients in OWServer).
Please define an <a href="#OWX">OWX</a> device or <a href="#OWServer">OWServer</a> device first. <br/></p>
<br /><h4>Example</h4>
<p>
<code>define OWX_AD OWAD 724610000000 45</code>
<br />
<code>attr OWX_AD DAlarm high</code>
<br />
<code>attr OWX_AD DFactor 31.907097</code>
<br />
<code>attr OWX_AD DHigh 50.0</code>
<br />
<code>attr OWX_AD DName RelHumidity|humidity</code>
<br />
<code>attr OWX_AD DOffset -0.8088</code>
<br />
<code>attr OWX_AD DUnit percent|%</code>
<br />
</p><br />
<a name="OWADdefine"></a>
<h4>Define</h4>
<p>
<code>define &lt;name&gt; OWAD [&lt;model&gt;] &lt;id&gt; [&lt;interval&gt;]</code> or <br/>
<code>define &lt;name&gt; OWAD &lt;fam&gt;.&lt;id&gt; [&lt;interval&gt;]</code>
<br /><br /> Define a 1-Wire A/D converter.<br /><br /></p>
<ul>
<li>
<code>[&lt;model&gt;]</code><br /> Defines the A/D converter model (and thus 1-Wire
family id), currently the following values are permitted: <ul>
<li>model DS2450 with family id 20 (default if the model parameter is
omitted)</li>
</ul>
</li>
<li>
<code>&lt;fam&gt;</code>
<br />2-character unique family id, see above
</li>
<li>
<code>&lt;id&gt;</code>
<br />12-character unique ROM id of the converter device without family id and CRC
code </li>
<li>
<code>&lt;interval&gt;</code>
<br />Measurement interval in seconds. The default is 300 seconds. </li>
</ul>
<br />
<a name="OWADset"></a>
<h4>Set</h4>
<ul>
<li><a name="owad_interval">
<code>set &lt;name&gt; interval &lt;int&gt;</code></a><br /> Measurement
interval in seconds. The default is 300 seconds. </li>
</ul>
<br />
<a name="OWADget"></a>
<h4>Get</h4>
<ul>
<li><a name="owad_id">
<code>get &lt;name&gt; id</code></a>
<br /> Returns the full 1-Wire device id OW_FAMILY.ROM_ID.CRC </li>
<li><a name="owad_present">
<code>get &lt;name&gt; present</code>
</a>
<br /> Returns 1 if this 1-Wire device is present, otherwise 0. </li>
<li><a name="owad_interval2">
<code>get &lt;name&gt; interval</code></a><br />Returns measurement interval in
seconds. </li>
<li><a name="owad_reading">
<code>get &lt;name&gt; reading</code></a><br />Obtain the measuement values. </li>
<li><a name="owad_alarm">
<code>get &lt;name&gt; alarm</code></a><br />Obtain the alarm values. </li>
<li><a name="owad_status">
<code>get &lt;name&gt; status</code></a><br />Obtain the i/o status values.
</li>
</ul>
<br />
<a name="OWADattr"></a>
<h4>Attributes</h4>
<ul>
<li><a name="owad_stateAL0"><code>attr &lt;name&gt; stateAL0 &lt;string&gt;</code></a>
<br />character string for denoting low normal condition, default is empty </li>
<li><a name="owad_stateAH0"><code>attr &lt;name&gt; stateAH0 &lt;string&gt;</code></a>
<br />character string for denoting high normal condition, default is empty </li>
<li><a name="owad_stateAL1"><code>attr &lt;name&gt; stateAL1 &lt;string&gt;</code></a>
<br />character string for denoting low alarm condition, default is down triangle,
e.g. the code &amp;#x25BE; leading to the sign &#x25BE;</li>
<li><a name="owad_stateAH1"><code>attr &lt;name&gt; stateAH1 &lt;string&gt;</code></a>
<br />character string for denoting high alarm condition, default is upward
triangle, e.g. the code &amp;#x25B4; leading to the sign &#x25B4; </li>
</ul> For each of the following attributes, the channel identification A,B,C,D may be used. <ul>
<li><a name="owad_cname"><code>attr &lt;name&gt; &lt;channel&gt;Name
&lt;string&gt;|&lt;string&gt;</code></a>
<br />name for the channel | a type description for the measured value. </li>
<li><a name="owad_cunit"><code>attr &lt;name&gt; &lt;channel&gt;Unit
&lt;string&gt;|&lt;string&gt;</code></a>
<br />unit of measurement for this channel | its abbreviation. </li>
<li><a name="owad_coffset"><b>deprecated</b>: <code>attr &lt;name&gt; &lt;channel&gt;Offset
&lt;float&gt;</code></a>
<br />offset added to the reading in this channel. </li>
<li><a name="owad_cfactor"><b>deprecated</b>: <code>attr &lt;name&gt; &lt;channel&gt;Factor
&lt;float&gt;</code></a>
<br />factor multiplied to (reading+offset) in this channel. </li>
<li><a name="owad_cfunction"> <code>attr &lt;name&gt; &lt;channel&gt;Function
&lt;string&gt;</code></a>
<br />arbitrary functional expression involving the values VA,VB,VC,VD. VA is replaced by
the measured voltage in channel A, etc. This attribute allows linearization of measurement
curves as well as the mixing of various channels. <b>Replacement for Offset/Factor !</b></li>
<li><a name="owad_calarm"><code>attr &lt;name&gt; &lt;channel&gt;Alarm
&lt;string&gt;</code></a>
<br />alarm setting in this channel, either both, low, high or none (default). </li>
<li><a name="owad_clow"><code>attr &lt;name&gt; &lt;channel&gt;Low
&lt;float&gt;</code></a>
<br />measurement value (on the scale determined by offset and factor) for low
alarm. </li>
<li><a name="owad_chigh"><code>attr &lt;name&gt; &lt;channel&gt;High
&lt;float&gt;</code></a>
<br />measurement value (on the scale determined by offset and factor) for high
alarm. </li>
<li>Standard attributes <a href="#alias">alias</a>, <a href="#comment">comment</a>, <a
href="#event-on-update-reading">event-on-update-reading</a>, <a
href="#event-on-change-reading">event-on-change-reading</a>, <a
href="#stateFormat">stateFormat</a>, <a href="#room"
>room</a>, <a href="#eventMap">eventMap</a>, <a href="#loglevel">loglevel</a>,
<a href="#webCmd">webCmd</a></li>
</ul>
=end html
=cut