B&B Electronics 3PCIOU1 Specifikace stáhnout pdf (Strana 52)

Connector Pinouts

B-2 Appendix B Document Number 3PCI-4310m

RS-422/485 Pinouts

Name Description Direction DB-9M

RDA(−)

Receive Data A (-) Input 1

TDB(+) Transmit Data B (+) Output 2

TDA(−)

Transmit Data A (-) Output 3

GND Signal Ground ------ 5

RDB(+) Receive Data B (+) Input 9

Figure 29. RS-422/485 Signal Designations and DB-9 Pinout

With 2-wire RS-485 mode operation, your connection cable must jumper TDA(-) to

RDA(-) and TDB(+) to RDB(+). Connect from TDA(-) and TDB(+) to the Data A(−) and

Data B(+) wires of your RS-485 network.

Note: Refer to Chapter 2 for example connections.

Note that the EIA RS-422 Specification labels data lines with an "A" and "B" designator.

Some RS-422 equipment uses a "−" and "+" designator. In almost all cases, the "A" line

is the equivalent of the "−" line and the "B" line is the equivalent of the "+" line.

Note: For more information on RS-422 communications refer to the

B&B Electronics RS-422/485 Application Note at www.bb-elec.com

Figure 30. 2-Wire RS-485 Wiring Diagram

1 2 ... 47 48 49 50 51 52 53 54 55 56 57

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B&B Electronics 3PCIOU1 Specifikace Strana 52