diff --git a/NEWS b/NEWS
index a0114ed9c..189e9aff0 100644
--- a/NEWS
+++ b/NEWS
@@ -13,6 +13,7 @@ Version 5.x -- future
         * Change FT1000MP Mark V model names to align with FT1000MP
 
 Version 4.6
+        * Added rig_cm108_get/set_bit to API and get/set_gpio to rigctl(d) for GPIO1,2,3,4 access on CM108
         * Added BG2FX FX4/C/CR/L
         * Fixed IC7610 to use new 0x25 0x26 command added in latest firmware
         * Fix W command in rigctld to work propery -- can take terminating char or # of bytes to expect
diff --git a/doc/man1/rigctl.1 b/doc/man1/rigctl.1
index a253c586e..b218ad994 100644
--- a/doc/man1/rigctl.1
+++ b/doc/man1/rigctl.1
@@ -1398,6 +1398,31 @@ Examples:
 .BR client_version " \(aq" \fIString\fP "\(aq
 .EX
   Client can send its version to rigctld and get feedback on compatibility, deprecation, and alternatives
+.TP
+.BR hamlib_version
+.EX
+Returns hamlib version with ISO8601 date/time
+.
+.TP
+.BR test
+.EX
+Performs test routines.  Under development.
+.
+.TP
+.BR set_gpio " \(aq" \fIGPIO#\fP "\(aq
+.EX
+Sets GPIO1, GPIO2, GPIO3, GPIO4 on the GPIO ptt port
+Can also use 1,2,3,4
+.
+.TP
+.BR XXXX
+.EX
+Stuff
+.
+.TP
+.BR XXXX
+.EX
+Stuff
 .
 .SH READLINE
 .
diff --git a/doc/man1/rigctld.1 b/doc/man1/rigctld.1
index 6112ef07e..871ce5953 100644
--- a/doc/man1/rigctld.1
+++ b/doc/man1/rigctld.1
@@ -1202,6 +1202,52 @@ CW Skimmer is started and "set_lock_mode 0" when CW Skimmer is stopped.
 .BR get_lock_mode
 Returns current lock mode status 1=On, 2=Off (only useful with rigctld)
 .
+.TP
+.BR send_raw " \(aq" \fITerminator\fP "\(aq \(aq" \fIString\fP \(aq
+.EX
+Can send ASCII string or 0xnn values -- there can be no spaces in the command string.
+Possible terminator values are CR, LF, ;, ICOM, 0-100 (bytes to read), or -1 meaning unknown (will timeout on read)
+Examples:
+  send_raw ; FA;MD;
+  send_raw icom 0xFE;0xFE;0x94;0x03;0xFD
+  send_raw -1 0xFE;0xFE;0x94;0x03;0xFD
+  send_raw 14 0xFE;0xFE;0x94;0x03;0xFD
+.
+.TP
+.BR client_version " \(aq" \fIString\fP "\(aq
+.EX
+  Client can send its version to rigctld and get feedback on compatibility, deprecation, and alternatives
+.TP
+.BR hamlib_version
+.EX
+Returns hamlib version with ISO8601 date/time
+.
++.TP
++.BR hamlib_version
++.EX
++Returns hamlib version with ISO8601 date/time
++.
++.TP
++.BR test
++.EX
++Performs test routines.  Under development.
++.
++.TP
++.BR set_gpio " \(aq" \fIGPIO#\fP "\(aq
++.EX
++Sets GPIO1, GPIO2, GPIO3, GPIO4 on the GPIO ptt port
++Can also use 1,2,3,4
++.
++.TP
++.BR XXXX
++.EX
++Stuff
++.
++.TP
++.BR XXXX
++.EX
++Stuff
+
 .
 .SH PROTOCOL
 .
diff --git a/include/hamlib/rig.h b/include/hamlib/rig.h
index 4e0dd8c9f..ad57c3390 100644
--- a/include/hamlib/rig.h
+++ b/include/hamlib/rig.h
@@ -3694,6 +3694,10 @@ extern HAMLIB_EXPORT(int) rig_is_model(RIG *rig, rig_model_t model);
 
 extern HAMLIB_EXPORT(char*) rig_date_strget(char *buf, int buflen, int localtime);
 
+enum GPIO { GPIO1, GPIO2, GPIO3, GPIO4 };
+extern HAMLIB_EXPORT(int) rig_cm108_get_bit(hamlib_port_t *p, enum GPIO gpio, int *bit);
+extern HAMLIB_EXPORT(int) rig_cm108_set_bit(hamlib_port_t *p, enum GPIO gpio, int bit);
+
 
 //! @endcond
 
diff --git a/src/cm108.c b/src/cm108.c
index d46c449c1..50587cad9 100644
--- a/src/cm108.c
+++ b/src/cm108.c
@@ -195,7 +195,7 @@ int cm108_ptt_set(hamlib_port_t *p, ptt_t pttx)
 
     case RIG_PTT_CM108:
     {
-        ssize_t nw;
+        ssize_t bytes;
         char out_rep[] =
         {
             0x00, // report number
@@ -227,9 +227,9 @@ int cm108_ptt_set(hamlib_port_t *p, ptt_t pttx)
         }
 
         // Send the HID packet
-        nw = write(p->fd, out_rep, sizeof(out_rep));
+        bytes = write(p->fd, out_rep, sizeof(out_rep));
 
-        if (nw < 0)
+        if (bytes < 0)
         {
             return -RIG_EIO;
         }
@@ -295,30 +295,122 @@ int cm108_ptt_get(hamlib_port_t *p, ptt_t *pttx)
  */
 int cm108_dcd_get(hamlib_port_t *p, dcd_t *dcdx)
 {
+    int bytes;
+
     rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);
 
-    // On the CM108 and compatible chips the squelch line on the radio is
-    // wired to Volume Down input pin.  The state of this pin is reported
-    // in HID messages from the CM108 device, but I am not sure how
-    // to query this state on demand.
-
-    switch (p->type.dcd)
-    {
-    case RIG_DCD_CM108:
-    {
-        return -RIG_ENIMPL;
-    }
-
-    default:
-        rig_debug(RIG_DEBUG_ERR,
-                  "%s: unsupported DCD type %d\n",
-                  __func__,
-                  p->type.dcd);
-        return -RIG_ENAVAIL;
-    }
-
     return RIG_OK;
 }
 #endif
 
+int cm108_set_bit(hamlib_port_t *p, enum GPIO gpio, int bit)
+{
+    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);
+
+    ssize_t bytes;
+    char out_rep[] =
+    {
+        0x00, // report number
+        // HID output report
+        0x00,
+        bit ? (1 << (gpio - 1)) : 0, // set GPIO
+        1 << (gpio - 1), // Data direction register (1=output)
+          0x00
+    };
+    rig_debug(RIG_DEBUG_VERBOSE, "%s: out_rep = 0x%02x 0x%02x\n", __func__,
+              out_rep[2], out_rep[3]);
+
+    // Build a packet for CM108 HID to turn GPIO bit on or off.
+    // Packet is 4 bytes, preceded by a 'report number' byte
+    // 0x00 report number
+    // Write data packet (from CM108 documentation)
+    // byte 0: 00xx xxxx     Write GPIO
+    // byte 1: xxxx dcba     GPIO3-0 output values (1=high)
+    // byte 2: xxxx dcba     GPIO3-0 data-direction register (1=output)
+    // byte 3: xxxx xxxx     SPDIF
+
+    // Send the HID packet
+    bytes = write(p->fd, out_rep, sizeof(out_rep));
+
+    if (bytes < 0)
+    {
+        return -RIG_EIO;
+    }
+
+    return RIG_OK;
+}
+
+int cm108_get_bit(hamlib_port_t *p, enum GPIO gpio, int *bit)
+{
+    ssize_t bytes;
+    char reply[4];
+    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);
+    char in_rep[] =
+    {
+        0x00, // report number
+        0x01, // HID input report
+        0x00,
+        0x00
+    };
+
+    // Send the HID packet
+    bytes = write(p->fd, in_rep, sizeof(in_rep));
+
+    if (bytes < 0)
+    {
+        return -RIG_EIO;
+    }
+
+    bytes = read(p->fd, reply, sizeof(reply));
+
+    if (bytes <= 0)
+    {
+        rig_debug(RIG_DEBUG_ERR, "%s: read error: %s\n", __func__, strerror(errno));
+        return -RIG_EPROTO;
+    }
+
+    int mask = 1 << (gpio - 1);
+    *bit = (reply[1] & mask) != 0;
+    rig_debug(RIG_DEBUG_VERBOSE,
+              "%s: mask=0x%02x, reply=0x%02x 0x%02x 0x%02x 0x%02x, bit=%d\n", __func__, mask,
+              reply[0], reply[1], reply[2], reply[3], *bit);
+    return RIG_OK;
+}
+
+int rig_cm108_get_bit(hamlib_port_t *p, enum GPIO gpio, int *bit)
+{
+    if (gpio < 1 || gpio > 4)
+    {
+        rig_debug(RIG_DEBUG_ERR, "%s: gpio must be 1,2,3,4 for cm108\n", __func__);
+        return -RIG_EINVAL;
+    }
+
+    cm108_get_bit(p, gpio, bit);
+    rig_debug(RIG_DEBUG_TRACE, "%s: gpio=%d bit=%d\n", __func__, gpio, *bit);
+    return RIG_OK;
+}
+
+
+int rig_cm108_set_bit(hamlib_port_t *p, enum GPIO gpio, int bit)
+{
+    if (gpio < 1 || gpio > 4)
+    {
+        rig_debug(RIG_DEBUG_ERR, "%s: gpio must be 1,2,3,4 for cm108\n", __func__);
+        return -RIG_EINVAL;
+    }
+
+    int retval = cm108_set_bit(p, gpio, bit);
+
+    if (retval != RIG_OK)
+    {
+        rig_debug(RIG_DEBUG_ERR, "%s: cm108_set_bit: %s\n", __func__, strerror(retval));
+        return retval;
+    }
+
+    rig_debug(RIG_DEBUG_TRACE, "%s: simulated gpio=%d bit=%d\n", __func__, gpio,
+              bit);
+    return RIG_OK;
+}
+
+
 /** @} */
diff --git a/src/gpio.c b/src/gpio.c
index 1b2602eee..e5fcfb597 100644
--- a/src/gpio.c
+++ b/src/gpio.c
@@ -189,4 +189,3 @@ int gpio_dcd_get(hamlib_port_t *port, dcd_t *dcdx)
 
     return RIG_OK;
 }
-
diff --git a/tests/rigctl_parse.c b/tests/rigctl_parse.c
index 1f1d1a0fd..90cfa9b19 100644
--- a/tests/rigctl_parse.c
+++ b/tests/rigctl_parse.c
@@ -267,6 +267,8 @@ declare_proto_rig(send_raw);
 declare_proto_rig(client_version);
 declare_proto_rig(hamlib_version);
 declare_proto_rig(test);
+declare_proto_rig(cm108_get_bit);
+declare_proto_rig(cm108_set_bit);
 
 
 /*
@@ -384,6 +386,8 @@ static struct test_table test_list[] =
     { 0xa6, "get_vfo_list",    ACTION(get_vfo_list), ARG_NOVFO },
     { 0xa7, "test",    ACTION(test), ARG_NOVFO | ARG_IN, "routine" },
     { 0xa8, "hamlib_version",    ACTION(hamlib_version), ARG_NOVFO },
+    { 0xa9, "get_gpio",    ACTION(cm108_get_bit), ARG_NOVFO | ARG_IN1 | ARG_OUT1, "GPIO#", "0/1" },
+    { 0xaa, "set_gpio",    ACTION(cm108_set_bit), ARG_NOVFO | ARG_IN , "GPIO#", "0/1" },
     { 0x00, "", NULL },
 };
 
@@ -5609,3 +5613,51 @@ declare_proto_rig(send_raw)
 
     return RIG_OK;
 }
+
+declare_proto_rig(cm108_get_bit)
+{
+    rig_debug(RIG_DEBUG_TRACE, "%s:\n", __func__);
+
+    int gpio = -1;
+    int bit = -1;
+    // try GPIO format first
+    int n = sscanf(arg1,"GPIO%d", &gpio);
+    if (n == 0)
+        n = sscanf(arg1,"%d", &gpio);
+    if  (n != 1) return -RIG_EINVAL;
+    int retval = rig_cm108_get_bit(&rig->state.pttport, gpio, &bit);
+    if (retval != RIG_OK)
+    {
+        rig_debug(RIG_DEBUG_ERR, "%s: %s\n", __func__, strerror(retval));
+        return retval;
+    }
+    rig_debug(RIG_DEBUG_TRACE, "%s: gpio=%d\n", __func__, gpio);
+    if ((interactive && prompt) || (interactive && !prompt && ext_resp))
+    {
+        fprintf(fout, "%s: ", cmd->arg2);
+    }
+    fprintf(fout, "%d (simulated)\n", 1);
+
+
+    return RIG_OK;
+}
+
+declare_proto_rig(cm108_set_bit)
+{
+    rig_debug(RIG_DEBUG_TRACE, "%s:\n", __func__);
+    int gpio, bit=-1;
+    // try GPIO format first
+    int n = sscanf(arg1,"GPIO%d", &gpio);
+    if (n == 0)
+        n = sscanf(arg1,"%d", &gpio);
+    if  (n != 1) return -RIG_EINVAL;
+    n = sscanf(arg2, "%d", &bit);
+    if  (n != 1) return -RIG_EINVAL;
+    rig_debug(RIG_DEBUG_TRACE, "%s: set gpio=%d, bit=%d\n", __func__, gpio, bit);
+    int retval = rig_cm108_set_bit(&rig->state.pttport, gpio, bit);
+    if (retval != RIG_OK)
+    {
+        rig_debug(RIG_DEBUG_ERR, "%s: %s\n", __func__, strerror(retval));
+    }
+    return retval;
+}