Chapter 2 I/O Interface
2-3
2_
2.2
Interface description
2.2.1 Serial port
Serial port
Pin
Communication interface
RS-232
RS-422
RS-485
1
DCD
TX-
Data-
2
RXD
TX+
Data+
3
TXD
RX+
-
4
DTR
RX-
-
5
GND
GND
GND
6
DSR
-
-
7
RTS
-
-
8
CTS
-
-
9
RI
-
-
2.2.2 USB 2.0
USB 2.0
Pin
Signal
1
USB VCC +5V
2
USB Data-
3
USB Data+
4
GND