Skid Posted March 6, 2013 Report Share Posted March 6, 2013 Hi.  I have both the USB port and Serial port connected to the box. however I dont get the serial port to work. (USB works just well) first.. I tryed to use rs232 TX, RX and Ground cable on the Serial port. I get no connection to ECU.. tryed to switch TX,RX cables but no look  what do I exactly need to connect, and do I need to make any changes in the configuration of the ECU, in order to use the serial port? G4 Communication port pin 5 (yellow) to rs232 db9 pin 3 G4 Comminucation port pin 6 (Grey) to rs232 db9 pin 2 G4 Communication port pin 1 (Brown) to rs232 db9 pin 5 (I use hardware serial rs232 on the computer.. no USB-Serial converter)  please advice   /Regards Nore Quote Link to comment Share on other sites More sharing options...
Simon Posted March 14, 2013 Report Share Posted March 14, 2013 If you have serial connected you will need to unplug the USB from the PC. TX RX and ground will be all you need Quote Link to comment Share on other sites More sharing options...
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