ASROCK B560M-HDV/M.2 User Manual page 27

Serial Port Header
(9-pin COM1)
(see p.6, No. 15)
RRXD1
DDTR#1
DDSR#1
CCTS#1
1
RRI#1
RRTS#1
GND
TTXD1
DDCD#1
B560M-HDV/M.2
This COM1 header
supports a serial port
module.
23