Figure 4. Rs-422 Wiring Diagram; Rs-485 And Rs-422 Termination; Power Supply - B&B Electronics 485DSS User Manual

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Figure 4. RS-422 Wiring Diagram

A jumper labeled "TERM" provides termination for the RS-

485/422 receiver. The termination resistor is a 120-ohm resistor

placed between the RD (A) and RD (B) lines. To use this

termination, place the jumper in the "IN" position. Refer to Figure 2

for the location of this jumper. If there is no need for termination,

place the jumper in the "OUT" position. For more discussion of

termination refer to B&B Electronics' free RS-422/485 Application

Note.

The 485DSS requires an unregulated DC power source that will

supply +12 volts at 100 milliamps. Connect the positive side of the

power source to the +12VDC terminal block and the common side of

the power source to the GND terminal block. Refer to Figure 2 for

the location of the terminal blocks and the polarity. B&B Electronics'

power supply Model 485PS2 is available for the 485DSS.

485DSS-0308 Manual

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

B&B Electronics – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91 792444 – Fax +353 91 792445

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