Advantech PPC-3150 User Manual page 60

COM 3: RS-422/485 with isolated 1000 V
Pin
RS-422
RS-485
UART RS-485 Auto Flow Control
COM 3 supports RS-485 auto-flow control function.
When RS-485 auto-flow control function is enabled, it will drive the RTS# pin to high
or low.
PPC-3150/3170/3190 User Manual
COM1 & 2 and 4 & 5 and DIO
CN38 & 39 and GPIO
DC
1 2
TX+ TX-
D+ D-
52
(configurable via the BIOS Setup Utility).
3 4
RX+ RX-
5
GND
GND