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The RS-232 connector is a DB-9, male connector. Adapters are available to connect the dc source to any
computer or terminal with a properly configured DB-25 connector (see Table 2-2).
Figure 3-6. RS-232 Connector
Pin
Input/Output
1
-
2
Input
3
Output
4
Output
5
Common
6
Input
7
Output
8
Input
9
-
1 2 3 4 5
6 7 8 9
Description
no connection
Receive Data (RxD)
Transmit Data (TxD)
Data Terminal Ready (DTR)
Signal ground
Data Set Ready (DSR)
Request to Send (RQS)
Clear to Send (CTS)
no connection
Installation - 3
27
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