AT&T 7400B Plus User Manual page 185

DEFINITY Communications System
7400B Plus Data Module
User´s Guide
Pin Circuit
1 —
2 BA (SD)
3 BB (RD)
4 CA (RTS)
5 CB (CTS)
6 CC (DSR)
7 AB (SG)
8 CF (RLSD)
9 —
10 —
11 —
12* CI
13 —
14 —
15 —
16 —
17 —
18 —
19 —
20 CD (DTR)
21 —
22 CE (RI)
23* CI
24 —
25 —
*CI on pin 12 is Bell 212A, on pin 23 is EIA-232-D
TABLE E-6
EIA-232-D PIN ASSIGNMENTS
Direction
—
to 7400B Plus
from 7400B Plus
to 7400B Plus
from 7400B Plus
from 7400B Plus
common
from 7400B Plus
—
—
—
from 7400B Plus
—
—
—
—
—
—
—
to 7400B Plus
—
from 7400B Plus
from 7400B Plus
—
—
APPENDIX E: QUICK-REFERENCE SUMMARIES
Function
not used
transmit data
receive data
request to send
clear to send
data set ready
signal ground
receive line signal detector
not used
not used
not used
data signal rate select
not used
not used
not used
not used
not used
not used
not used
data terminal equipment ready
not used
ring indicator
data signal rate select
not used
not used
Page E-9