RayTech Navigator User’s Guide

To wire an RS-232 device to provide input to an NMEA device:

1.Connect the RS-232 Device’s Tx lead to the NMEA Device’s Rx+ lead.

2.Connect the RS-232 Device’s SGnd lead to the NMEA Device’s Rx- lead.

To wire an RS-232 device to receive input from an NMEA device:

1.Connect the RS-232 Device’s Rx lead to the NMEA Device’s Tx+ lead.

2.Connect the RS-232 Device’s SGnd lead to the NMEA Device’s Tx- lead.

To wire an RS-232 device to provide input to and receive input from an NMEA device:

1.Connect the RS-232 Device’s Tx lead to the NMEA Device’s Rx+ lead.

2.Connect the RS-232 Device’s Rx lead to the NMEA Device’s Tx+ lead.

3.Connect the RS-232 Device’s SGnd lead to the NMEA Device’s Tx- and Rx- leads.

There are some infrequent cases where binding the NMEA device’s Tx- and Rx- leads together may cause difficulties. If you do encounter problems, you’ll need to use an RS-232-to-NMEA converter between the two devices. A converter is typically required very rarely (in less than 1% of applications; however, the modern Furuno radar systems, for example, do require them), but is still a good place to begin trouble- shooting if problems arise with the RS-232/NMEA interconnection.

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Raymarine Marine GPS System manual RayTech Navigator User’s Guide