Nuvo-2500 Series User’s Manual
Copyright © 2015 Neousys Technology Inc. All Right Reserved.
Page 36 of 154
2.2.8 Software-programmable COM Ports
Figure 10: Software-programmable COM Ports
On the front panel, Nuvo-2500 Series provides two software-selectable COM ports for
communicating with external devices. Each port supports RS-232/422/485, and the
operation mode of each port can be set in BIOS setup utility. COM ports are implemented
using industrial-grade ITE8783 Super IO chip (-40 to 85°C) and provide up to 115200 bps
baud rate. The following table describes the pin definition of two software-selectable COM
ports.
Table 17: Pin Definition of COM1 and COM 2
Pin No.
COM1 / COM2
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