37 UTC-320 User Manual
Appendix A I/O Pin Assignments
UART RS485 Auto Flow Control
COM2 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
Table A.11: CN13: COM2
Part Number 1655000197
Footprint WF_5x2P_79_BOX_D_P1R
Description 1655_WF_5x2P_79_BOX_D_P1R_0.Normal
Pin Pin name
1 422/485 TX-
2 422/485 TX+
3 422 RX+
4 422 RX-
5 GND
6 DSR#
7 RTS#
8 CTS#
9 RI#
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