Nuvo-3000 Series User’s Manual
Copyright © 2013 Neousys Technology Inc. All Right Reserved.
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2.3.3 COM Ports (COM1 & COM2)
Nuvo-3000 provides two COM ports on the back panel for communicating with external
devices. COM1 and COM2 are located on the back panel via 9-pin D-Sub male connectors.
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.
For Nuvo-3000TB series, one additional RS-232 port (COM3) is provided via an internal
box header. For users who need the 3
rd
COM port, Neousys offers a cable kit to connect the
internal connector and expose a 9-pin D-Sub connector on the back panel.
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