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AR-B1851 User’s Guide
AR-B1851
14
3.2 Serial Ports(COM1~4)
The AR-B1851 offers two high speeds NS16C550 compatible UARTs
with Read/Receive 16 byte FIFO serial ports.
• COM2 : RS-232 Serial port (Pin Header)
•
COM1 : RS-232 with RS-422/485 Serial port(Pin Header)
PIN DESCRIPTION PIN DESCRIPTION
1 -DCD 2 -DSR
3 RXD 4 -RTS
5 TXD 6 -CTS
7 -DTR 8 -RI
9 GND 10 NC
PIN DESCRIPTION PIN DESCRIPTION
1 -DCD 2 -DSR
3 RXD 4 -RTS
5 TXD 6 -CTS
7 -DTR 8 -RI
9 GND 10 GND
11 TX+ 12 TX-
13 RX+ 14 RX-