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RS-232↔485/422 CONVERTERS

Appendix A. Pinning

Table 3. RS-232 interface

(* 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.

1 2 ... 24 25 26 27 28 29 30 31 32 33

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