Definitions of Signals and Direction

EIA-232

EIA-422

EIA-485

Direction

Description

 

 

 

 

 

RI

 

 

In

Ring Indicator

DCD

 

 

In

Data Carrier Detect

RTS

 

 

Out

Request To Send

 

RTS+

 

Out

Request to Send

 

RTS-

 

Out

Request to Send

DSR

 

 

In

Data Set Ready

TXD

 

 

Out

Transmit Data

 

TXD+

 

Out

Transmit Data

 

TXD-

 

Out

Transmit Data

 

 

TXD-/RXD-

In/Out

Transmit/Receive Data

 

 

TXD+/RXD+

In/Out

Transmit/Receive Data

RXD

 

 

In

Receive Data

 

RXD+

RXD+

In

Receive Data

 

RXD-

RXD-

In

Receive Data

S-GND

S-GND

S-GND

 

Signal Ground

CTS

 

 

In

Clear to Send

 

CTS+

 

In

Clear to Send

 

CTS-

 

In

Clear to Send

DTR

 

 

Out

Data Terminal Ready

C-GND

C-GND

C-GND

 

Chassis Ground

 

 

 

 

 

Note

Only the UltraPort SI series of cards supports EIA-422 and EIA-485 interface modes.

UltraPort Serial Adaptors User Guide

Chapter 3 Cabling information

Definitions of Signals and Direction

Page 103

 

Page 103
Image 103
Perle Systems Adaptors manual Definitions of Signals and Direction, EIA-232 EIA-422 EIA-485 Direction Description