A SERVICE OF

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2-13
Hardware Setup
Serial Port Connector: COM1, COM2, COM3, COM4
This connector is a 16550A high speed communications port that sends/receives 16
bytes FIFOs. You can attach a serial device to it through the optional serial port
bracket.
PIN SIGNAL DESCRIPTION
1 DCD Data Carry Detect
2 SIN Serial In or Receive Data
3 SOUT Serial Out or Transmit Data
4 DTR Data Terminal Ready
5 GND Ground
6 DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
9 VCC_COM3 Power Source
Pin Definition
COM1/2/3/4
1
9
2
10
COM4 COM3
COM1 COM2
Voltage Select Serial Port Serial Port Voltage Select
J4
(page 2-17)
J5
(page 2-17)
J7
(page 2-17)
J6
(page 2-17)
COM1 COM2
COM4 COM3