From 7f29073cff2a19c2ae0e94f03430dadf03c13233 Mon Sep 17 00:00:00 2001
From: Michael Wiebusch <m.wiebusch@gsi.de>
Date: Fri, 16 Jan 2015 17:20:55 +0100
Subject: [PATCH] correction in pmt_ro.pm in the signal_thresh sub

---
 user_interface/pmt_ro.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/user_interface/pmt_ro.pm b/user_interface/pmt_ro.pm
index 17d7a2d..0324586 100644
--- a/user_interface/pmt_ro.pm
+++ b/user_interface/pmt_ro.pm
@@ -193,7 +193,7 @@ sub signal_thresh {
   
   my $value = $options{value};
   
-  if($value){
+  if(defined($value)){
     #if value is given, write threshold
     $self->write_register(regName => "signal_thresh", value => $value+$self->{settings}->{signal_zero});
     $self->{settings}->{signal_thresh} = $value;
-- 
2.43.0