Digi EIA-422 Connector Wiring

Use the information below to find the pin assignments for EIA-422 models of EtherLite Terminal Servers.

A terminal, a serial printer, or a serial port for another computer usually functions as a DTE device. The Digi terminal server is also a DTE device. To connect a DTE device to another DTE device a null modem cable or adapter must be used.

Two wires (one twisted pair) are required for each EIA-422 signal, a positive lead ("+"), and a negative lead ("-"). The "+" leads at one end of the cable must be connected to the "+" leads at the other end, and the "-" leads at one end must be connected to the "-" leads at the other end.

Incorrect wiring could result in damage to the connected devices. The following table shows the pin configuration for the EIA-422 versions of Digi EtherLite Terminal Servers.

Signal

Description

RJ-45 Pin

RTS*

Request To Send (EIA-232)

1

RxD-

Received Data (-)

2

DCD*

Data Carrier Detect (EIA-232)

3

RxD+

Received Data (+)

4

TxD+

Transmitted Data (+)

5

SG*

Signal Ground (EIA-232)

6

TxD-

Transmitted Data (-)

7

CTS

Clear To Send (EIA-232)

8

*RTS and DCD are available, but remain single-ended EIA-232 signals, and require Signal Ground (pin 6) as a reference.