The EM500EV-IB0 RS232 interface board implements one RS232 serial port. The port is built around SIPEX SP3243 RS232 transceiver IC. RS232 interface lines are available on a standard DB-9M connector:
Pin # (DB-9M)
R232 line (DB-9M)
EM500 control line
1
CD (input)
GPIO4/P0.4
2
RX (input)
RX
3
TX (output)
TX
4
DTR (output)
GPIO3/P0.3
5
SYSTEM GROUND
6
DSR (input)
GPIO1/P0.1/INT1
7
RTS (output)
GPIO2/P0.2
8
CTS (input)
GPIO0/P0.0/INT0
9
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