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Nuvo-5095GC Series User’s Manual
Copyright © 2017 Neousys Technolgy Inc. All Right Reserved.
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2.3.2 COM Ports (COM1 / COM2 / COM3)
Nuvo-5095GC series provides three COM ports for communicating with external devices.
COM1, COM2 and COM3 are located on the back panel via 9-pin D-Sub male connectors.
They are implemented using industrial-grade ITE8786 Super IO chip (-40 to 85°C) and
provide up to 115200 bps baud rate.
COM1 and COM3 are software-configurable RS-232/422/485 ports and COM2 is a
standard 9-wire RS-232 port . The operation mode, slew rate and termination of COM1 and
COM3 can be set in BIOS setup utility (refer to section 4.1.1 for detail). The following table
describes the pin definition of COM ports.
COM1 / COM3
COM2
Pin#
RS-232 Mode
RS-422 Mode
RS-485 Mode
(Two-wire 485)
RS-232 Mode
1
DCD
DCD
2
RX
422 TXD+
485 TXD+/RXD+
RX
3
TX
422 RXD+
TX
4
DTR
422 RXD-
DTR
5
GND
GND
GND
GND
6
DSR
DSR
7
RTS
RTS
8
CTS
422 TXD-
485 TXD-/RXD-
CTS
9
RI
RI