ASROCK B560M-HDV R2.0 Handbuch Seite 27

Serial Port Header
(9-pin COM1)
(see p.1, No. 18)
24
RRXD1
DDTR#1
DDSR#1
CCTS#1
1
RRI#1
RRTS#1
GND
TTXD1
DDCD#1
This COM1 header
supports a serial port
module.