Lowrance electronic globalmap baja 840c 用户手册

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The diagram above has a double T connector with two 120-ohm termina-

tors — one at each end of the connector. It is easy to expand this network 

by removing a terminator from one end of the double T connector, then 

inserting a new T connector or extension cable between the double T con-

nector and terminator (See the NMEA 200 network general information 

document that came with your unit for more information). 

To exchange NMEA 0183 data, this unit has two NMEA 0183 version 

2.0 communication ports. Serial Communications Port one (Com1) and 

Serial Communications Port two (Com2) can be used to transmit or re-

ceive NMEA format GPS data.  
The five wires for the Serial Communications Ports are combined with 

the Display Unit Power cable and NMEA 2000 Power cable to form the 

power/data cable (shown earlier). Com1 uses the yellow wire to trans-

mit, the orange wire to receive and the shield wire for signal ground. 

Com2 uses the blue wire to transmit, the green wire to receive and the 

shield wire for signal ground.