diff --git a/src/rig.c b/src/rig.c
index 5adad7484..51835e1f7 100644
--- a/src/rig.c
+++ b/src/rig.c
@@ -2076,6 +2076,7 @@ int HAMLIB_API rig_set_ptt(RIG *rig, vfo_t vfo, ptt_t ptt)
 
     case RIG_PTT_SERIAL_RTS:
 
+        rig_debug(RIG_DEBUG_ERR, "%s: PTT RTS\n", __func__);
         /* when the PTT port is not the control port we want to free the
            port when PTT is reset and seize the port when PTT is set,
            this allows limited sharing of the PTT port between
@@ -2084,6 +2085,7 @@ int HAMLIB_API rig_set_ptt(RIG *rig, vfo_t vfo, ptt_t ptt)
                 && rs->pttport.fd < 0
                 && RIG_PTT_OFF != ptt)
         {
+            rig_debug(RIG_DEBUG_ERR, "%s: PTT RTS debug#1\n", __func__);
 
             rs->pttport.fd = ser_open(&rs->pttport);
 
@@ -2103,10 +2105,12 @@ int HAMLIB_API rig_set_ptt(RIG *rig, vfo_t vfo, ptt_t ptt)
 
             if (RIG_OK != retcode)
             {
+                rig_debug(RIG_DEBUG_ERR, "%s: ser_set_dtr retcode=%d\n", __func__, retcode);
                 return retcode;
             }
         }
 
+        rig_debug(RIG_DEBUG_ERR, "%s: PTT RTS debug#2\n", __func__);
         retcode = ser_set_rts(&rig->state.pttport, ptt != RIG_PTT_OFF);
 
         if (strcmp(rs->pttport.pathname, rs->rigport.pathname)
@@ -2143,6 +2147,7 @@ int HAMLIB_API rig_set_ptt(RIG *rig, vfo_t vfo, ptt_t ptt)
 
     rig->state.cache.ptt = ptt;
     elapsed_ms(&rig->state.cache.time_ptt, ELAPSED_SET);
+    if (retcode != RIG_OK) rig_debug(RIG_DEBUG_ERR, "%s: return code=%d\n", __func__, retcode);
     return retcode;
 }