text: <s>[INST] COMMUNICATION PROBLEM WITH A 1394-SJT05-T-RL GMC SERVO DRIVE I HAVE A COMMUNICATION PROBLEM WITH A 1394-SJT05-T-RL GMC SERVO DRIVE. I CAN´T GO ONLINE WITH GML COMMANDER. I CHECK RS-232 INTERFACE CONNECTIONS, PORT CONFIGURATION IN MY PC AND THE SERIAL PORT CONFIGURATION SWITCH BUT I CAN´T GO ONLINE. SERIAL PORT CONFIGURATION SWITCH (PORT J4) 1-RIGHT 2-LEFT 3-RIGHT 4-LEFT 5-LEFT 6-RIGHT PORT CONFIGURATION PC BITS PER SECOND-115200 DATA BITS- 8 PARITY- SPACE STOP BITS- 1 FLOW CONTROL-XON XOFF [/INST] The unit has 2 comm ports as I remember, Have you tried both ports, and have tried with a straight and a cross cable? Has your PC a real serial port, or are you using a USB to serial converter? Not all serial converters work on these communication. Jack \\n </s>