User`s manual

2-4 Intellio C218Turbo /PCI User's Manual
Operating Opt8J
Opt8J is the RS-422/485 connection box with 8 port female DB25 connectors for
MOXA 8 port boards, including the Intellio C218Turbo/PCI. There are 8-DIP
switches on the side of the Opt8J. Each switch controls the communication mode
(RS-422 or RS-485) of each port, respectively.
RS-422/485 Port Switch of Opt8J
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
DIP
ONDIP
RS-422 Mode
Set the respective switch to OFF position to use RS-422 interface. This means the
port is always ready to transmit and receive data simultaneously (full-duplex).
RS-485 Mode
The Opt8J supports only 2-wire RS-485 communication. Set the respective switch to
ON position to use RS-485 interface. This means the port can transmit data only
when RTS is asserted, and receive data only when RTS is not asserted (half-duplex).
Refer to Chapter “Connection Option (Opt8x) and Cable Wiring” for RS-422/RS-
485 cable wiring. And also to Chapter “Serial Programming Tools” for Opt8J RS-
485 programming details.