Switch Settings; Switch Description - StarTech.com ICUSB422IS Instruction Manual

Switch Settings

The default settings on the ICUSB422IS are set at 2-wire RS-485 mode. If you require
RS422, change the mode pin to the "422" position (ON). Maintain all other settings
unchanged.

Switch Description

Switch Switch
Pin # Function
1
2
NO ECHO
3
4
Note: If the mode is set to 422, the ECHO setting will take no effect. The echo mode
is useful for the program to detect if the RS-485 bus were in a collision. If the echoed
data is not equal to the transmitted data, then the bus has been in a collission.
Instruction Manual
Switch
Positions
RS-485
(Default)
RS-422
ECHO
(Default)
NO TERM
TERM
RVD
Description
(OFF)
(ON)
Transmitting data will be echoed
(OFF)
(ON)
(OFF)
Termination Resistor is Disabled
(default)
(ON) Termination Resistor is Enabled
(OFF)
(ON)
3
2-wire RS-485 mode
4-wire RS-422 mode
back
No echo data
Reserved for Future Use
Reserved for Future Use