Avaya 6424D+M User Manual download pdf (Page 55)

Technical Information

EIA-232-D Lead Operation

The following description assumes single-stream operation which is the case when API is not

being used. Refer to the ISDN Application Programming Interface Programmer’s Manual for

more information on single-stream and autostream.

This section describes the assignments of the EIA-232-D leads.

Interface to Attached Terminal

Pin Direction Function EIA Circuit

Mnemonic

2 To ADM Transmitted Data BA

3 From ADM Received Data BB

4 To ADM Request-to-Send CA

5 From ADM Clear-to-Send CB

6 From ADM DCE Ready CC

7 Signal Ground AB

8 From ADM Received Line Signal Detector CF

20 To ADM DTE Ready CD

22 From ADM Ring Indicator CE

Pin 2 — Transmitted Data (BA)

The ADM receives data from the attached data terminal at 98 to 101 percent of the selected

speed. The data from the attached terminal must have one start bit, eight information bits, and at

least one stop bit. The ADM ignores parity in the local mode (except for xon/xoff flow control)

and transports it transparently in the data mode. The ADM supports only ASCII-formatted data

in the local mode. The ADM recognizes a BREAK signal as 10 bits of spacing plus 20

milliseconds. The setting of the BREAK option governs the ADM’s response to break in the

data mode.

Pin 3 - Received Data (BB)

Signals on this circuit are generated by the ADM in response to data received from the remote

data equipment or to user commands from the data terminal. This circuit is held in the MARK

state when Received Line Signal Detect is OFF except for user testing and during the Local

Mode. The ADM transmits the BREAK signal as 200 milliseconds of SPACE.

Technical Information 6-1

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Avaya 6424D+M User Manual Page 55