IBM 5155 Manual To Operations page 353

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Connectorhdonnation
Rear View
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13J
14 25
25-Pin Connector
Signal Name - Description Pin
NC
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
+
Transmit Current Loop Return 9
NC
10
External
Device
Transmit Current Loop Data
11
Asynchronous
NC
12
Communications
NC
13
Adapter
NC
14
NC
15
NC
16
NC
17
+
Receive Current Loop Data
18
NC 19
Data Terminal Ready
20
NC
21
Ring Indicator
22
NC
23
NC
24
Receive Current Loop Return
25
January
1984
Asynchronous
5