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RS-232↔485/422 CONVERTERS

Figure 9. Sample Multipoint Operation.

Installation Procedure for the Multipoint Application in Figure 9

1. Set all the RS-232↔485/422 Converters for DCE operation (jumper XW1 in

position A).

2. Connect a straight-through cable from the RS-232 port on each

RS-232↔485/422 Converter to the RS-232 port on each of the PLCs.

3. Set all the RS-232↔485/422 Converters for normal operation (switch S1 in

the “Normal” position).

4. After a remote station has been addressed, two-way data transmission can

occur between that station and the industrial controller until the industrial

controller sends a “CLEAR” command. This command causes the remote

PLC to resume data logging while waiting to be addressed again. Therefore,

set each RS-232↔485/422 Converter for full-duplex operation (jumper W8 in

the “FULL” [A-B] position).

5. Connect the RS-232↔485/422 Converters together via a 4-wire twisted-pair

cable (see Figure 7).

6. Terminate (switch S2 in the TERM position) the two RS-232↔485/422

Converters that have the greatest cable run between them and leave the

others unterminated (switch S2 in the UNTERM position).

RS-232↔485/422

Converter Plus

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Plus RS-232 Especificações Página 27