4
5
3
2
1
8
9
7
6
TXD
+5V (0.5
RXD
DSR
GND
DTR
CTS
RTS
Serial/Industrial Interface Kit Installation Instructions 21
Chapter 3 — Serial Interface
Connector Confi guration (RS-232 on "uart2:", "uart3:", or "uart4:")
DB-9 socket Signal Meaning
1 External +5VDC max 500 mA (automatic switch-
off at overload, short-circuit protected)
2 TXD Transmit data
3 RXD Receive data
4 DSR Data set ready
5 GND Ground
6 DTR Data terminal ready
7 CTS Clear to send
8 RTS Request to send
9 – Not used
RS-232 socket as seen from the outside.
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