diff --git a/src/amplifier.c b/src/amplifier.c
index c0f164945..bffbfe7cf 100644
--- a/src/amplifier.c
+++ b/src/amplifier.c
@@ -418,6 +418,23 @@ int HAMLIB_API amp_open(AMP *amp)
         }
     }
 
+    if(rs->ampport.parm.serial.dtr_state == RIG_SIGNAL_ON)
+    {
+        ser_set_dtr(&rs->ampport, 1);
+    }
+    else
+    {
+        ser_set_dtr(&rs->ampport, 0);
+    }
+    if(rs->ampport.parm.serial.rts_state == RIG_SIGNAL_ON)
+    {
+        ser_set_rts(&rs->ampport, 1);
+    }
+    else
+    {
+        ser_set_rts(&rs->ampport, 0);
+    }
+
     memcpy(&amp->state.ampport_deprecated, &amp->state.ampport,
            sizeof(amp->state.ampport_deprecated));
 
diff --git a/src/rotator.c b/src/rotator.c
index b5ed9de07..a2ccec07b 100644
--- a/src/rotator.c
+++ b/src/rotator.c
@@ -65,6 +65,7 @@
 #include "network.h"
 #include "rot_conf.h"
 #include "token.h"
+#include "serial.h"
 
 
 #ifndef DOC_HIDDEN
@@ -515,6 +516,22 @@ int HAMLIB_API rot_open(ROT *rot)
             return status;
         }
     }
+    if(rs->rotport.parm.serial.dtr_state == RIG_SIGNAL_ON)
+    {
+        ser_set_dtr(&rs->rotport, 1);
+    }
+    else
+    {
+        ser_set_dtr(&rs->rotport, 0);
+    }
+    if(rs->rotport.parm.serial.rts_state == RIG_SIGNAL_ON)
+    {
+        ser_set_rts(&rs->rotport, 1);
+    }
+    else
+    {
+        ser_set_rts(&rs->rotport, 0);
+    }
 
     memcpy(&rot->state.rotport_deprecated, &rot->state.rotport,
            sizeof(rot->state.rotport_deprecated));