Avaya 555-233-116 manual Adjusting the control-panel display on the 7400A

Connect data modules

D

D

D

R

C

T

S

R

C

T

T

T

R

R

R

I

D

S

S

D

D

HOME

POWER

0

0

—

0

0

0

—

—

TEST

DATA

NEXT/NO

BACK

ENTER/YES

✹

7400A Data Module

✹

❍

❍

❍

Adjusting the control-panel display on the 7400A

1.Adjust the contrast of the display so that you can see it comfortably. Press the ENTER/YES button. This steps you through the available contrast settings.

0 0 — 0 0 0 — —
	DATA	NEXT/NO		BACK		ENTER/YES
	●		❍		❍	➜ ●
Push the button indicated by the arrow (➜ )

7400A data module, EIA RS-232 interface circuits

The data module communicates with other equipment through a configurable, 25- pin RS-232 serial interface. DCE and DTE operation use different sets of pins and assign different functions to some of the same pins. To avoid confusion later on, please take a moment to review the differences. See the table below (the pins most discussed in subsequent sections have been emphasized).

Pin	Name	Function	DCE	DTE
1	—	Not used	—	—
2	BA (TD)	Transmitted Data	Input	Output
3	BB (RD)	Received Data	Output	Input
4	CA (RTS)	Request to Send	Input	Output
5	CB (CTS)	Clear to Send	Output	Input
6	CC (DSR)	Data Communication Equipment Ready	Output	Input
7	AB (SG)	Signal Ground	Common	Common
8	CF (RLSD)	Received Line Signal Detector	Output	Input

Continued on next page

555-233-116 Issue 4 October 2002 59