I'm upgrading a boat from the 1734C display to the MFD-12 display. One of the devices on the boat requires RS232 NMEA for heading and positioning information. The device was connected to DATA 3 pin 1 (TD_DT) and pin 7 (GND) on the 1734C display. Which data port should I connect the device on the MFD-12 or do I need to use a RS422 to RS232 converter? I don't know if the MFD-12 is capable to output RS232 NMEA.