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ASROCK Q1900B-ITX User Manual page 20

Motherboard
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Serial Port Header
(9-pin COM2)
(see p.7, No. 9)
16
This COM2 header
RRXD1
DDTR#1
DDSR#1
supports a serial port
CCTS#1
module.
1
RRI#1
RRTS#1
GND
TTXD1
DDCD#1
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