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In some cases it may be desirable to install a serial port multiplexer board (Mux) into the
system as well. Detailed information regarding the CNI and Mux board can be found in
the relevant owners manual for these items. It should be mentioned however that it may
be necessary to trim-off the header pins from the Mux board, if this was not previously
done. Access to the header pins is not required, and in fact would pose a mechanical
assembly conflict if left intact as seen in Figure-3.
Figure-3
Optional RS-232 Multiplexer Board
Electrical connections to the CNI board are of course required, and a cable has been
provided for this purpose as illustrated in Figure-4. The six position connector shown at
the left of Figure-4 attaches to J1 of the RS-485 board. The rectangular power connector
(R.H. side of drawing) connects to J3 on the CNI board. Remaining are the four
individual wires that must be attached to the CNI terminal block. Terminal block
positions are indicated for reference.
Figure-4
Cable Assembly, RS-485 Board to CNI Board