ASRock J3455-NUC-DL [15/31] Com1 port pin definition

The front panel design may differ by chassis. A front panel module mainly

consists of power switch, reset switch, power LED, hard drive activity LED,

speaker and etc. When connecting your chassis front panel module to this

header, make sure the wire assignments and the pin assign-ments are

matched correctly.

CCTS#

RRI#

DDSR#

DDTR#

GND

TTXD

DDCD#

RRTS#

RRXD

COM Port Header (RS232/422/485)

(9-pin COM1: see p.8, No. 4)

* This motherboard supports RS232/422/485 on COM1 port. Please refer to below table for the

pin denition. In addition, COM1 port (RS232/422/485) can be adjusted in BIOS setup utility >

Advanced Screen > Super IO Conguration. You may refer to page 23 for details.

PIN RS232 RS422 RS485

1 DCD TX- RTX-

2 RXD TX+ RTX+

3 TXD RX+ N/A

4 DTR RX- N/A

5 GND GND GND

6 DSR N/A N/A

7 RTS N/A N/A

8 CTS N/A N/A

9 N/A N/A N/A

10 N/A N/A N/A

COM1 Port Pin Denition

USB 2.0 Connector There is one USB 2.0

(9-pin USB2_4_5)

connector on this

(see p.8 No. 5)

motherboard. Each USB 2.0

connector can support two USB

ports.

GND

+ 5V

FA N_SPEED_CONTROL

FA N_SPEED

Back Side:

Fan Connector Power Button