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Nuvo-7501 Series
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2.2.11 Nuvo-7505D Isolated COM Port
The system provides four isolated COM ports that can shield the controller from
ground loops while communicating with external devices. These COM ports are
implemented using industrial-grade ITE8786 Super IO chip (-40 to 85°C) and provide
up to 115200 bps baud rate.
COM1 and COM2 are software-configurable RS-232/422/485 ports. COM3 and
COM4 are standard 9-wire RS-232 ports. The operation mode of COM1 and COM2
can be set in BIOS setup utility. The following table describes the pin definition of
COM ports.
COM Port Pin Definition
COM1 & COM2
COM3 & COM4
Pin#
RS-232
Mode
RS-422 Mode
RS-485 Mode
(Two-wire 485)
RS-232 Mode
1
DCD
2
RX
422 TXD+
485 TXD+/RXD+
RX
3
TX
422 RXD+
TX
4
DTR
422 RXD-
5
GND
ISOGND
ISOGND
ISOGND
6
DSR
7
RTS
8
CTS
422 TXD-
485 TXD-/RXD-
9
RI