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9 PIN 'D' RS-232 PIN ASSIGNMENT
PIN #
FUNCTION
1
N/C
2
RECEIVE DATA
3
TRANSMIT DATA
4
DATA TERMINAL READY OUTPUT from SCI-MRX
5
SIGNAL GROUND
6
DATA SET READY
7
READY TO SEND
8
CLEAR TO SEND
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.
APPENDIX A – SCI PROTOCOL AND INTERFACE
5
9
8
DIRECTION
----
INPUT to SCI-MRX
OUTPUT from SCI-MRX
N/A
INPUT to SCI-MRX
OUTPUT from SCI-MRX
INPUT to SCI-MRX
----
PIN OUT
4
3
7
6
SCI-MRX Serial Port
A9
2
1
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