Advantech PPC-6120 User Manual page 39

COM5: RS422/485 with Isolation 1000 VDC, BIOS selectable
Pin
RS422
RS485
UART RS485 Auto Flow Control
COM5 supports RS485 auto flow control function for all UART.
When enabling the RS485 auto control function, it will automatically drive RTS# pin
to logic high or low for flow control.
To make this RS485 auto flow control function work, please be noted that the parity
and stop-bit setting has to be one of the following three settings:
(1) 8 data bits + 1 parity bit + 1stop bit
(2) 8 data bits + 1 parity bit + 2 stop bits
(3) 8 data bits + 2 stop bits
PPC-6120 User Manual
1 2
TX+ TX-
D+ D-
3 4
RX+ RX-
30
5
GND
GND