Rs-232 Interface, Pin Assignments; Appendix A: Rs-232 Interface - Avaya 6424D+M User Manual

DEFINITY Communications System
DEFINITY High Speed Link
User´s Guide

Appendix A: RS-232 Interface

Pin No.
2
3
4
5
6
7
8
12
13
14
15
16
17
20
22
This appendix contains the circuits provided on the 25-pin
interface for RS-232 asynchronous call set up and disconnect.
When optioned for RS-232 dialing, this interface supports the ATD
dial and ATH disconnect commands for call control.
TABLE A-1

RS-232 interface, pin assignments

Circuit
BA (TD) Transmitted Data
BB (RD) Received Data
CA (RTS) Request to Send
CB (CTS) Clear to Send
CC (DSR) Data Set Ready
AB (SG) Signal Ground
CF (RLSD) Received Line Signal Detector
Not used (output always OFF)
Not used (output always OFF)
Not used (input ignored)
Not used (input ignored)
Not used (input ignored)
Not used (input ignored)
CD (DTR) Data Terminal Ready
CE (RI) Ring Indicator
Note: The HSL ignores the RTS and DTR input leads, holds CTS,
RLSD, and DSR outputs ON, and the RI output OFF.
Output data lead is not used and is always set to MARK.
Description
Appendix A: RS-232 Interface
Page A-1
Termination
Receiver
Driver
Receiver
Driver
Driver
Common
Driver
Driver
Driver
Receiver
Receiver
Receiver
Receiver
Receiver
Driver