Lucent Technologies DEFINITY Installation For Adjuncts And Peripherals page 59

DEFINITY ECS Release 8.2
Installation for Adjuncts and Peripherals 555-233-116
4 Data Modules and Asynchronous Data Units
Connect Data Modules
POWER
TEST
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 via 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
1 —
2 BA (TD)
3 BB (RD)
4 CA (RTS)
5 CB (CTS)
6 CC (DSR)
7 AB (SG)
8 CF (RLSD)
D D D R
T S R C T
R R I D S
0 0 — 0 0
7400A Data Module
0 0 — 0 0
Push the button indicated by the arrow ( )
Function
Not used
Transmitted Data
Received Data
Request to Send
Clear to Send
Data Communication Equipment Ready
Signal Ground
Received Line Signal Detector
C
T T R
S D D
0 — —
DATA
0 — —
DATA
April 2000
HOME
NEXT/NO BACK ENTER/YES
NEXT/NO BACK ENTER/YES
DCE DTE
— —
Input Output
Output Input
Input Output
Output Input
Output Input
Common Common
Output Input
Continued on next page
Issue 1
37