diff --git a/src/rig.c b/src/rig.c
index 51835e1f7..304b39d19 100644
--- a/src/rig.c
+++ b/src/rig.c
@@ -2117,6 +2117,7 @@ int HAMLIB_API rig_set_ptt(RIG *rig, vfo_t vfo, ptt_t ptt)
                 && ptt == RIG_PTT_OFF)
         {
 
+            rig_debug(RIG_DEBUG_ERR, "%s: PTT RTS debug#3\n", __func__);
             /* free the port */
             ser_close(&rs->pttport);
         }
diff --git a/src/serial.c b/src/serial.c
index 358320448..63625a485 100644
--- a/src/serial.c
+++ b/src/serial.c
@@ -808,10 +808,13 @@ int HAMLIB_API ser_set_rts(hamlib_port_t *p, int state)
     }
 
 #if defined(TIOCMBIS) && defined(TIOCMBIC)
+    rc = IOCTL(p->fd, TIOCMGET, &y);
+    rig_debug(RIG_DEBUG_TRACE,"%s: IOCTL#1 got y=%d\n", __func__, y);
     rc = IOCTL(p->fd, state ? TIOCMBIS : TIOCMBIC, &y);
+    rig_debug(RIG_DEBUG_TRACE,"%s: IOCTL#1 after set y=%d\n", __func__, y);
 #else
     rc = IOCTL(p->fd, TIOCMGET, &y);
-
+    rig_debug(RIG_DEBUG_TRACE,"%s: IOCTL#2 got y=%d\n", __func__, y);
     if (rc >= 0)
     {
         if (state)
@@ -823,7 +826,10 @@ int HAMLIB_API ser_set_rts(hamlib_port_t *p, int state)
             y &= ~TIOCM_RTS;
         }
 
+        rig_debug(RIG_DEBUG_TRACE,"%s: IOCTL#2 set y=%d\n", __func__, y);
         rc = IOCTL(p->fd, TIOCMSET, &y);
+        rc = IOCTL(p->fd, TIOCMGET, &y);
+        rig_debug(RIG_DEBUG_TRACE,"%s: IOCTL#2 after set y=%d\n", __func__, y);
     }
 
 #endif