NM-251A    Dual-in NMEA buffer splitter 5-output  (User Guide)
 
Introduction, Operation, Input ports , Output ports, Connections, Power Supply, LED Indicators, 
Dip-switch & Jumper settings, Specifications, Printed Circuit board, Downloads, Typical applications Certificates
Price ... 240.00 EURO
Connections
Try to interconnect using RS-422 when possible. Available TTL output for older instruments are available.
Use the RS-232 Serial I/O for testing data and avoid connection of AC computers with DC powered instruments via RS-232
It is always better to install RS-422 ports in the computer to avoid RS-232 connections.
Figure 1: 
Connection to RS-422 Outputs
Figure 2: 
Connection to TTL outputs
Figure 3: 
Combined use of TTL and RS-422 outputs
Power Supply
The NM-251A can be powered within the range of 10-35 VDC. The nominal voltage of 24 Vdc is advised for powering the device in normal operation. Power input port has a protection for incorrect polarity connection of the supplying voltage.

LED indicator sequence 


Ina LED ON

Currently sampling from primary port Ina

Inb LED ON

Currently sampling from secondary port Inb

Out 1/2 LED Flashing

indicates data transmission to output port 1 and 2

Out 3/4 LED Flashing

indicates data transmission to output port 3 and 4

Out5 LED Flashing

indicates reception from RS-232 port and transmission to Out5 port


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