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Host-to-I/O PLEXER - RS-485:
Figure 2-12 RS-485 Host to I/O PLEXER Wiring
The wiring figure shows one shielded, twisted pair of AWG 24 (such as Beldon 9841, or 9341) with the shield 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 wir 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 uses pins 16-02-0103.
As shown in Figure 2-12, the + terminals of To and From, and the - terminals of the To and From are connected. These connections should not be made in the clamping terminal block or Molex connector alone. A combination of the two can be used, one for jumpering, and the other for the incoming and outgoing connections. Another option is to use an external terminal block, or leads between the clamp terminal block and Molex connectors.
In additon to the Host-to-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 uses pins 16-02-0103. 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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