Avaya 555-233-116 Telephone User Manual


 
Connect data modules
Issue 4 October 2002
59555-233-116
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.
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).
D
T
R
D
S
R
R
I
D
C
D
R
T
S
C
T
S
T
D
R
D HOME
POWER
TEST
0 0 —00 0—
DATA NEXT/NO BACK ENTER/YES
7400A Data Module
❍❍❍
0 0 —00 0—
DATA NEXT/NO BACK ENTER/YES
❍❍
Push the button indicated by the arrow ()
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
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