
Nuvo-4000 Series User’s Manual
Copyright © 2014 Neousys Technology Inc. All Right Reserved.
Page 16 of 76
2.2.8 COM Ports
Nuvo-4000 provides three COM ports for
communicating with external devices. These COM
ports are implemented using industrial-grade
ITE8783 Super IO chip (-40 to 85°C) and provide up
to 115200 bps baud rate.
COM1 and COM2 are software-selectable
RS-232/422/485 ports and COM3 supports RS-232
only. The operation mode of COM1 and 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.
COM1 & COM2
COM3
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