POC-100 User’s Manual
Copyright © 2013 Neousys Technology Inc. All Right Reserved.
Page 23 of 65
Optional COM Ports (COM3 & COM4)
POC-100 provides two optional COM ports, COM3 and COM4, via two on-board 2x5 pins,
2.0mm pitch box headers. They are also implemented using industrial-grade ITE8783
Super IO chip (-40 to 85°C) and support up to 115200 bps baud rate.
COM3 supports software-selectable RS-232/422/485 mode and COM4 support 9-wire
RS-232 operation. For users who need to connect devices via standard DSub-9 connectors,
please refer to the following pin definition for wiring. Neousys also provides an optional
cable kit to expose the DSub-9 connector.
COM3
COM4
Pin#
RS-232 Mode
RS-422 Mode
RS-485 Mode
(Two-wire 485)
RS-232 Mode
1
DCD
DCD
2
DSR
DSR
3
RX
422 TXD+
485 TXD+/RXD+
RX
4
RTS
RTS
5
TX
422 RXD+
TX