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Appendix B. CS I/O Connection

B.1 CS I/O 9-Pin Connection

The pinout of the connector is shown in FIGURE B-1. The direction of the

signal relative to the modem is shown in parentheses. Unless specified

otherwise, all levels are 0 V for logic low, 5 V for logic high.

FIGURE B-1. CS I/O pinout

1. (input) +5 Vdc supply. Used to power internal line drivers for ‘Ring’ and

‘RX Data’ output signals.

2. (input) Ground

3. (output) Ring — A logic high signifies a ring signal has been detected.

4. (output) RX Data — Serial data from COM220

5. (input) Modem Enable — A logic high internally switches power to the

modem. A logic low internally shuts off power to the modem.

6. (input) Serial Device Enable — A logic high disables communication with

the modem without removing power or changing the modem's mode.

7. (input) SDC clock

8. (input) +12 Vdc supply

9. (input) TX Data — Serial data to COM220

B-1

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Campbell COM220 Bedienerhandbuch Seite 33