Merge pull request microsoft#1140 from microsoft/serial-fix

Serial fix

Author: robotdad

src/serialmonitor/serialportctrl.ts

@@ -79,6 +79,11 @@ export class SerialPortCtrl {
               reject(err);
             } else {
               this._outputChannel.appendLine(`[Info] Opened the serial port - ${this._currentPort}`);
+              this._currentSerialPort.set(["dtr=true"], (err) => {
+                if (err) {
+                  reject(err);
+                }
+              });
               resolve();
             }
           });
@@ -164,7 +169,13 @@ export class SerialPortCtrl {
         if (err) {
           reject(err);
         } else {
-          resolve();
+          this._currentSerialPort.set(["dtr=true"], (err) => {
+            if (err) {
+              reject(err);
+            } else {
+              resolve();
+            }
+          });
         }
       });
     });