IBM 5155 Manual To Operations page 358

Connectorhllonnation
Rear View
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External
Device
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• • • • • • • • • •
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14 25
25·Pin Connector
Signal Name - Description
No Connection
Transmitted Data
Received Data
Request to Send
Clear to Send
Data Set Ready
Signal Ground
Received Line Signal Detector
No Connection
No Connection
*Select Standby
No Connection
No Connection
No Connection
Pin
1
-
2
3
-
-
4
5
-
-
6
7
-
8
9
10
11
-
12
13
14
Transmitter Signal Element Timing -
15
No Connection
16
Receiver Signal Element Timing
-
17
*Test (IBM Modems Only)
No Connection
Data Terminal Ready
No Connection
Ring Indicator
Data Signal Rate Selector
18
-
19
20
-
21
22
- -
23
I
\
Binary
Synchronous
Communications
Adapter
No Connection
24
*Test Indicate (IBM Modems Only) -
25
*Not standardized by EIA (Electronics Industry Assoc.)
4 BSC
January 1984