Document Reference No.: ES_000086

ES-R-2x01B-M RS-232 to RS-422/RS-485 Converters Manual

Version 1.0

Clearance No.: ES

©2010 - 2011 EasySYNC Ltd.

11

Wiring diagrams

The following diagram shows an RS-422 full-duplex bus. The ES-R-2x01B-M converters have a built-in

resistor for terminating their RxD ± input, which can be enabled using a jumper. The Tx ± lines which are

outputs from the ES-R-2x01B-M are terminated at the receiver at the other end of the bus as shown.

Twisted pair wires are required for each signal pair.

Figure 4

RS-422 4 Wire Full Duplex

The following diagram shows an RS-422 full-duplex bus with handshaking signals connected. The ES-R-

2x01B-M converters have built-in resistors for terminating their RxD ± and CTS ± inputs, which can be

enabled using jumpers. The TxD ± and RTS ± lines which are outputs from the ES-R-2x01B-M are

terminated at the receiver at the other end of the bus as shown. Twisted pair wires are required for each

signal pair.

Figure 5

RS-422 with handshaking signals connected

RS-422 Device

ES-R-2x01B-M

RxD+

TxD+

RxD-

TxD-

TxD+

RxD+

TxD-

RxD-

GND

GND

CTS+

RTS+

CTS-

RTS-

RTS+

CTS+

RTS-

CTS-

RS-422 Device

ES-R-2x01B-M

RxD+

TxD+

RxD-

TxD-

TxD+

RxD+

TxD-

RxD-

GND

GND