If you see the “Modem Not Responding” error on a CLA2000, then it indicates that the 120 Ohm resistors are not fitted to the six NMEA 0183 Inputs and electrical noise at power up, causes the main processor to think the modem has a problem. There are three inputs on the 18 Way Connector and if you have the 14 Way connector fitted, then there are additional three inputs on this cable as well – see the connection tables below, where the six NMEA 0183 Inputs are highlighted by red rectangles. Simply connect a 120 Ohm resistor between the RX A and RX B wiresRead More →