Nuvo-2400
User’s Manual
Copyright © 2015 Neousys Technology Inc. All Right Reserved.
Page 22 of 81
3.1.6 Software-programmable COM Ports
Figure 6: Software-programmable COM ports
Nuvo-2400 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 ITE
8783 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 8: Pin definition of COM1 & COM2
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