Installation 2
2 - 10
Host to I/O Plexer - RS-422
Figure 2-11 RS-422 Host to I/O Plexer wiring
The wiring figure shows two individually shielded twisted pairs of AWG 24
(such as Belden 9729) with the shields connected between unit grounds. In a
perfect world with no electrical noise and equal ground potentials everywhere the
ground connection is not required. Not using the ground connection can lead 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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