
Installation 2
2 - 13
I/O Plexer to I/O plexer - RS-485
Figure 2-14 RS-485 I/O Plexer to I/O Plexer wiring
Figure 2-14 shows one individually shielded twisted pairs of AWG 24 with an
overall isolated shield (such as Belded 8162) with the internal shield connected
between unit grounds. The overall isolated shield should be connected to earth
ground in one place only. In a perfect wold with no electrical noise and equal
ground potentials, the signal ground connection would not be required. Not
connecting signal ground however, frequently leads to costly debugging.
These connections, which require the cover to be removed, are made by placing a
1/4 inch stripped wire into the openings of the wire clamp terminal block and
tightening the screw. This block is socketed for easy removal. An alternative
means for network connection is to use the 10 pin male connector located behind
the clamp terminal block. This connector mates with Molex shell, number 50-57-
9005, and used pins, 16-02-0103
In addition to the Host to I/O PLEXER wiring the installer should confirm that
the network type switches are set in the correct positions, multidrop, repeat, or
last unit. Refer to appendix A for details concerning the switches marked “pull
up” in figure 2-5
.
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