ASROCK iEP-7020E Series User Manual page 48

Serial (COM3) Port* : The 9-pin RS232/422/485 serial connector allows you to
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connect devices that have serial ports.
* This motherboard supports RS232/422/485 on COM3 port. Please refer to table below for the pin
definition. In addition, COM3 port (RS232/422/485) can be adjusted in BIOS setup utility > Ad-
vanced Screen > Super IO Configuration. You may refer to our user manual for details.
Pin
1
2
3
4
5
6
7
8
9
DPR : The 15-pin D-sub connector allows you to program it for input, output,
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power on or reset use.
Antenna : The antenna hole allows you to connect a wireless antenna to enhance
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wireless signal reception.
Storage LED : Storage LED indicator behaviors vary depending on the storage
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module you use.
COM3 Port Pin Definition
RS232
DCD, Data Carrier Detect
RXD, Receive Data
TXD, Transmit Data
DTR, Data Terminal Ready
GND
DSR, Data Set Ready
RTS, Request To Send
CTS, Clear To Send
N/A
iEP-7020E Series
RS422 RS485
TX- RTX-
TX+ RTX+
RX+ N/A
RX- N/A
GND GND
N/A N/A
N/A N/A
N/A N/A
N/A N/A
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