diff --git a/iec1107.pm b/iec1107.pm
index 5439bd1..ff6d232 100755
--- a/iec1107.pm
+++ b/iec1107.pm
@@ -16,6 +16,7 @@ use Device::SerialPort;
 
 #for time conversion
 use DateTime::Format::Strptime qw( strptime );
+use DateTime;
  
 #constants
 our $SOH = chr(0x01);
@@ -125,6 +126,36 @@ sub log_off() {
   return $self;
 };
 
+sub write_reg($$) {
+  my $self = shift;
+  my ($reg, $val) = @_;
+  unless (ref $self){croak "call with an object, not a class";}
+
+  my $res = $self->_xfer(_generate_w1_msg("reg"=>$reg, "val"=>$val));
+  if ($res ne $ACK) {
+    print("No Ack for write operation $reg : $val \n");
+  };
+  return $self;
+};
+
+sub set_clock() {
+  my $self = shift;
+  my $res;
+  unless (ref $self){croak "call with an object, not a class";}
+  $res = $self->write_reg(31, _scale_datetime_to_raw_time(DateTime->now()));
+  # this function reliably returns an ACK
+  return $self;
+};
+
+sub reset_energy() {
+  my $self = shift;
+  my $res;
+  unless (ref $self){croak "call with an object, not a class";}
+  $res = $self->write_reg(0x40, "00000000");
+  # this function does not reliably return an ACK, to be checked
+  return $self;
+};
+
 sub _xfer {
   my $self = shift;
   my ($cmd) = @_;
@@ -134,7 +165,7 @@ sub _xfer {
   $self->port->write( $cmd );
   ($count,$res)=$self->port->read(32);
   return $res;
-}
+};
 
 
 # Object accessor methods
@@ -183,6 +214,13 @@ sub _scale_raw_time_to_datetime($){
   return $dt;
 };
 
+sub _scale_datetime_to_raw_time($){
+  my ($dt) = @_;
+  my $fmt = "%y%m%d0%w%H%M%S";
+  my $str = $dt->strftime($fmt);
+  return $str;
+};
+
 sub _scale_to_temp($){
   my ($val) = @_;
   my $hex = "";
@@ -210,6 +248,16 @@ sub _generate_r1_msg(%){
 };
 
 
+sub _generate_w1_msg(%){
+  my %args = @_;
+  my $reg = $args{reg};
+  my $val = $args{val};
+  my $regstr = sprintf("%08d(%d)",$reg,$val);
+  my $msg=_generate_programming_command_message("command"=>"W","commandtype"=>1,"data"=>$regstr);
+  return $msg;
+};
+
+
 sub _generate_p1_msg(%){
   my %args = @_;
   my $passwd = $args{password};
diff --git a/test_drs110m.pl b/test_drs110m.pl
index ffd771c..69de8de 100644
--- a/test_drs110m.pl
+++ b/test_drs110m.pl
@@ -38,6 +38,9 @@ for my $id (@ids) {
 
   $drs110m->start_programming_mode();
 
+  #$drs110m->set_clock();
+  #$drs110m->reset_energy();
+
   $drs110m->update_values();
 
   while ( my ($reg, $val) = each(%{$drs110m->regs})){#Note: this type switching in perl is crazy!