diff --git a/gui/main.js b/gui/main.js
index 48a1b3b1..9a7d2e5d 100644
--- a/gui/main.js
+++ b/gui/main.js
@@ -64,6 +64,8 @@ const configDefaultSettings = '{\
                   "enable_hamlib_serialspeed" : "False",\
                   "hamlib_serialspeed" : "9600",\
                   "enable_hamlib_pttprotocol" : "False",\
+                  "hamlib_dtrstate" : "OFF",\
+                  "enable_hamlib_dtrstate" : "False",\
                   "hamlib_pttprotocol" : "USB",\
                   "enable_hamlib_pttport" : "False",\
                   "hamlib_pttport": "/dev/ttyACM1",\
diff --git a/gui/preload-main.js b/gui/preload-main.js
index 58b475bb..9aa9b168 100644
--- a/gui/preload-main.js
+++ b/gui/preload-main.js
@@ -109,6 +109,12 @@ set_setting_switch("enable_hamlib_ptt_port", "hamlib_ptt_port", config.enable_ha
     document.getElementById('hamlib_dcd').value = config.hamlib_dcd;
     set_setting_switch("enable_hamlib_dcd", "hamlib_dcd", config.enable_hamlib_dcd)
 
+    document.getElementById('hamlib_dtrstate').value = config.hamlib_dtrstate;
+    set_setting_switch("enable_hamlib_dtrstate", "hamlib_dtrstate", config.enable_hamlib_dtrstate)
+
+
+
+
 
     document.getElementById("hamlib_rigctld_ip").value = config.hamlib_rigctld_ip;
     document.getElementById("hamlib_rigctld_port").value = config.hamlib_rigctld_port;
@@ -531,6 +537,11 @@ set_setting_switch("enable_hamlib_ptt_port", "hamlib_ptt_port", config.enable_ha
         enable_setting("enable_hamlib_dcd", "hamlib_dcd")
     });
 
+        // radio settings 'enable hamlib dtr state' event listener
+    document.getElementById("enable_hamlib_dtrstate").addEventListener("change", () => {
+        enable_setting("enable_hamlib_dtrstate", "hamlib_dtrstate")
+    });
+
 
 /*
 document.getElementById('hamlib_rigctld_path').addEventListener('change', () => {
@@ -622,6 +633,16 @@ document.getElementById('hamlib_rigctld_start').addEventListener('click', () =>
         paramList = paramList.concat('--ptt-type=', hamlib_ptt_type)
     }
 
+    // hamlib dtr state
+    if (document.getElementById('enable_hamlib_dtrstate').checked){
+        var hamlib_dtrstate = document.getElementById("hamlib_dtrstate").value;
+        paramList = paramList.concat('--set-conf=dtr_state=' + hamlib_dtrstate)
+    }
+
+
+
+
+
     var hamlib_rigctld_server_port = document.getElementById("hamlib_rigctld_server_port").value;
     paramList = paramList.concat('-t', hamlib_rigctld_server_port)
 
diff --git a/gui/src/index.html b/gui/src/index.html
index 31c72198..be0588ee 100644
--- a/gui/src/index.html
+++ b/gui/src/index.html
@@ -615,14 +615,13 @@
 										<option value="RIG">RIG</option>
 										<option value="USB">USB</option>
 										<option value="RTS">Serial RTS</option>
-										<option value="DTR-H">Serial DTR-High</option>
-										<option value="DTR-L">Serial DTR-Low</option>
 										<option value="PARALLEL">Rig PARALLEL</option>
 										<option value="MICDATA">Rig MICDATA</option>
 										<option value="CM108">Rig CM108</option>
 									</select>
 								</div>
-								<div class="input-group input-group-sm mb-1"> <span class="input-group-text" id="basic-addon1">DCD</span> <span class="input-group-text" id="basic-addon1">
+								<div class="input-group input-group-sm mb-1">
+									<span class="input-group-text" id="basic-addon1">DCD</span> <span class="input-group-text" id="basic-addon1">
                                  <input class="form-check-sm form-check-input" type="checkbox" id="enable_hamlib_dcd">
                               </span>
 									<select class="form-select form-select-sm" aria-label=".form-select-sm" id="hamlib_dcd" style="width: 0.5rem">
@@ -633,7 +632,19 @@
 										<option value="CD">CD</option>
 										<option value="PARALLEL">PARALLEL</option>
 									</select>
+
+
+								<span class="input-group-text" id="basic-addon1">DTR</span> <span class="input-group-text" id="basic-addon1">
+                                 <input class="form-check-sm form-check-input" type="checkbox" id="enable_hamlib_dtrstate">
+                              </span>
+									<select class="form-select form-select-sm" aria-label=".form-select-sm" id="hamlib_dtrstate" style="width: 0.5rem">
+										<option value="OFF">OFF</option>
+										<option value="ON">ON</option>
+
+									</select>
 								</div>
+
+
 							</div>
 							<!-- RADIO CONTROL NETWORK -->
 							<div id="radio-control-network">