IBM 5155 Manual To Operations page 362

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