RS-232↔485/422 CONVERTERS
Appendix A. Pinning
Table 3.
(* denotes pins that are used).
Pin | Circuit | Description | Signal Type | Direction |
| |
|
|
|
| when configured as | ||
|
|
|
| DCE |
| DTE |
|
|
|
|
|
|
|
1* | AA | Protective Ground | Ground | - |
|
|
|
|
|
|
|
|
|
2* | BA | Transmitted Data | Data | Input |
| Output |
|
|
|
|
|
|
|
3* | BB | Receive Data | Data | Output |
| Input |
|
|
|
|
|
|
|
4* | CA | Request to Send | Control | Input |
| Output |
|
|
|
|
|
|
|
5* | CB | Clear to Send | Control | Output |
| Not connected |
|
|
|
|
|
|
|
6* | CC | Data Set Ready | Control | Output |
| Not connected |
|
|
|
| (held |
|
|
|
|
|
| high) |
|
|
|
|
|
|
|
|
|
7* | AB | Signal Ground | Ground | - |
|
|
|
|
|
|
|
|
|
8* | CF | Data Carrier Detect | Control | Output |
| Input |
|
|
|
|
|
|
|
NOTE
Pins 9 through 25 are not used.
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