diff --git a/Universal_Serial_Adapter/Config.cpp b/Universal_Serial_Adapter/Config.cpp
index 42add7d..75e7b1d 100644
--- a/Universal_Serial_Adapter/Config.cpp
+++ b/Universal_Serial_Adapter/Config.cpp
@@ -148,3 +148,38 @@ void Config::setDefaults() {
 	setMode(ttl);
 	setTimeout(thirtyseconds);
 }
+
+void Config::processSerialData() {
+	switch (currentMode) {
+		case 1: // ttl
+			if (Serial1.available()) {
+				int inByte = Serial1.read();
+				Serial.write(inByte);
+			}
+			if (Serial.available()) {
+				int inByte = Serial.read();
+				Serial1.write(inByte);
+			}
+			break;
+		case 2: // db9_null
+			if (Serial2.available()) {
+				int inByte = Serial2.read();
+				Serial.write(inByte);
+			}
+			if (Serial.available()) {
+				int inByte = Serial.read();
+				Serial2.write(inByte);
+			}
+			break;
+		case 3: // cisco
+			if (Serial3.available()) {
+				int inByte = Serial3.read();
+				Serial.write(inByte);
+			}
+			if (Serial.available()) {
+				int inByte = Serial.read();
+				Serial3.write(inByte);
+			}
+			break;
+	}
+}
\ No newline at end of file
diff --git a/Universal_Serial_Adapter/Config.h b/Universal_Serial_Adapter/Config.h
index db27c9f..2fae59a 100644
--- a/Universal_Serial_Adapter/Config.h
+++ b/Universal_Serial_Adapter/Config.h
@@ -43,6 +43,7 @@ public:
 	void disableUI();
 	void enableUI();
 	bool isUIEnabled();
+	void processSerialData();
 };
 
 #endif
diff --git a/Universal_Serial_Adapter/Universal_Serial_Adapter.ino b/Universal_Serial_Adapter/Universal_Serial_Adapter.ino
index f314a74..56f5efa 100644
--- a/Universal_Serial_Adapter/Universal_Serial_Adapter.ino
+++ b/Universal_Serial_Adapter/Universal_Serial_Adapter.ino
@@ -33,7 +33,12 @@ void setup() {
 }
 
 void loop() {
+  // Serial data is processed at multiple points to prevent
+  //   UI code from interfering with communication
+  config->processSerialData();
   ui->processInputEvents();
+  config->processSerialData();
   ui->processTimeoutEvents();
+  config->processSerialData();
 }