Index: /fact/BIASctrl/User.cc
===================================================================
--- /fact/BIASctrl/User.cc	(revision 11361)
+++ /fact/BIASctrl/User.cc	(revision 11362)
@@ -15,6 +15,6 @@
 								const char *Help;
   } CommandList[] = 
-   {{"pixel", &User::cmd_hv, 2, "<pixel id> <volt|default>", "Change bias of pixel"},
-	{"channel", &User::cmd_hv, 2, "<channel range> <v>", "Change bias of (all) channels of active crate"},
+   {{"pixel", &User::cmd_hv, 2, "<pix id> <volt|default>", "Change bias of pixel (to default value)"},
+	{"channel", &User::cmd_hv, 2, "<range> <volt|default>", "Change bias of (all) channels of active crate"},
     {"gs", &User::cmd_gs, 1, "[crate] <volt>", "Global voltage set active crate"},
 	{"reset", &User::cmd_reset, 0, "", "Reset active crate"},
@@ -235,13 +235,7 @@
   
 	// Convert voltage value and check format 
-	if (!ConvertToDouble(Parameter[n+1], &Double)) {
-	  if (Match(Parameter[0], "pixel") && Match(Parameter[n+1], "default")) {
-		if (PixelID < DefaultVoltage.size()) Double = DefaultVoltage[PixelID];
-		else Double = 0;
-	  }
-	  else {
-		PrintMessage("Error: Wrong number format for voltage setting\n");
-		continue;
-	  }
+	if (!ConvertToDouble(Parameter[n+1], &Double) && !Match(Parameter[n+1], "default")) {
+	  PrintMessage("Error: Wrong number format for voltage setting\n");
+	  continue;
 	}
 
@@ -252,5 +246,20 @@
  
 	  // Voltage change (number starts with + oder -) ignored if current DAC value is zero
-	  if (isdigit(Parameter[n+1][0])==0 && Crates[i]->GetDAC(j) == 0) continue;
+	  if ((Parameter[n+1][0]=='+' || Parameter[n+1][0]=='-') && Crates[i]->GetDAC(j) == 0) continue;
+
+	  // Should the default value be set?
+	  if (Match(Parameter[n+1], "default")) {
+	    // Pixel ID given directly or channel number?
+	    if (!Match(Parameter[0], "pixel")) {
+	      vector<unsigned int> List = PixMap->HV_to_Pixel(i, j/NUM_CHANNELS, j%NUM_CHANNELS);
+	      if (!List.empty()) PixelID = List[0];
+	      else PixelID = numeric_limits<unsigned int>::max();
+	    }
+
+            // Set default voltage
+	    if (PixelID < DefaultVoltage.size()) Voltages[i][j] = DefaultVoltage[PixelID];
+	    else Voltages[i][j] = 0;
+	    continue;
+	  }
 
 	  // Relative or absolute change?