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Nuvo-3100 Series User’s Manual
Copyright © 2014 Neousys Technology Inc. All Right Reserved.
Page 18 of 99
2.2.8 COM Ports (COM1 & COM2)
Nuvo-3100 series provides two COM ports via two 9-pin D-Sub male connectors on the
front panel for communicating with external devices. They are implemented using
industrial-grade ITE8783 Super IO chip (-40 to 85°C) and provide up to 115200 bps baud
rate.
Both COM1 and COM2 support software-selectable RS-232/422/485 mode. The operation
mode of COM1/COM2 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.
Pin#
RS-232 Mode
RS-422 Mode
RS-485 Mode
(Two-wire 485)
1
DCD
2
RX
422 TXD+
485 TXD+/RXD+
3
TX
422 RXD+
4
DTR
422 RXD-
5
GND
GND
GND
6
DSR
7
RTS
8
CTS
422 TXD-
485 TXD-/RXD-
9
RI