diff --git a/common/modules/mixly-modules/web/usb-mini.js b/common/modules/mixly-modules/web/usb-mini.js
index 2a922740..6ce5ec7b 100644
--- a/common/modules/mixly-modules/web/usb-mini.js
+++ b/common/modules/mixly-modules/web/usb-mini.js
@@ -295,6 +295,15 @@ class USBMini extends Serial {
             || (this.getDTR() === dtr && this.getRTS() === rts)) {
             return;
         }
+        if (this.#ctrlInterfaceNumber_ !== -1) {
+            await this.#device_.controlTransferOut({
+                requestType: 'class',
+                recipient: 'interface',
+                request: 0x22,
+                value: dtr | (rts << 1),
+                index: this.#ctrlInterfaceNumber_
+            });
+        }
         await super.setDTRAndRTS(dtr, rts);
     }