Sigma MRX Series

APPENDIX A – SCI PROTOCOL AND INTERFACE

9 PIN 'D' RS-232 PIN ASSIGNMENT

PIN # FUNCTION∗ DIRECTION

1 N/C ----

2 RECEIVE DATA INPUT to SCI-MRX

3 TRANSMIT DATA OUT PUT from SCI-MRX

4 DATA TERMINAL READY OUTPUT from SCI-MRX

5 SIGNAL GROUND N/A

6 DATA SET READY INPUT to SCI-MRX

7 READY TO SEND OUTPUT from SCI-MRX

8 CLEAR TO SEND INPUT to SCI-MRX

9 N/C ----

The Pin assignments noted are per the RS-232 standard. Although the standard defines the

use of twenty five (25) Pins, only nine (9) are required for PC serial communications. Of those nine

pins, only seven are required for communication to the SCI when handshaking is required. If

handshaking is not required only three pins will be active. There is no need to jumper the

handshaking pins when unused. Consult the control device manufacturer’s data sheet to determine

proper wiring.

PIN OUT

SCI-MRX Serial Port

5 1

2 3 4

8 7 6