Specifications

8S RS232/422/485 PCI Express Expansion Module
4
Mode Setting Table:
Switch Settings Description
RS485 2-wire mode
(Default)
RS485 4-wire mode
RS422 mode
Echo mode enabled
(Note:
Only applicable for
RS485-2W mode)
2. Terminator Switches (T1 to T8 for Port 1 to Port 8
respectively):
The design of each RS485 and RS422 port has built-in 2 120 Ohm
termination resistors. One is in between RX+ and RX-, controlled by DIP
switch pin 1; another is in between TX+ and TX-, controlled by DIP
switch pin 2. When the switch pin is set ON, the corresponding
terminator resistor is enabled, otherwise it is disabled (floated). Both
switch pins were set to OFF by the factory default settings.
T1 to T8 DIP Switches:
ON
1 2 3 4
RS485-2W
RS485-4W
RS422
ECHO
ON
1 2 3 4
RS485-2W
RS485-4W
RS422
ECHO
ON
1 2 3 4
RS485-2W
RS485-4W
RS422
ECHO
ON
1 2 3 4
RS485-2W
RS485-4W
RS422
ECHO