IBM 5150

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Asynchronous Communications Adapter Connector
Interface Specifications
REAR PANEL
/""\ \\
o _OCZ5
~ 0~
AT STANDARD TTL LEVELS
...
Description
NC
Transmit Data
....
Receive Data
Request to send
...
,
Clear to send
Data set ready
Signal ground
Carrier detect
...
+Transmit current loop return (20 rna)
~
NC
-Transmit current loop data (20 rna)
NC
....L
External
Device
NC
NC
NC
NC
NC
+Receive current loop data (20 rna)
NC
Data Terminal Ready
....
NC
Ring Indicate
NC
NC
- Receive current loop return (20 rna)
0
• 25
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•
•
•
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•
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14
•
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0
Pin
1
2
3
..
4
5
..
r'
6
..
7
8
..
9
10
11
Asynchronous
12
Communications
13
Adapter
14
(RS232C)
15
16
17
18
...
...
19
20
21
22
23
•
24
25
..
..
NOTE: To avoid inducing voltage surges on interchange circuits, signals from interchange
circuits
shall not be used to drive inductive devices, such as relay coils.
2-147