RS422/485 to USB Adapter with Isolation and Surge Protection
2
RS485 User: Since the factory settings are initially set at 2-wire
RS485 mode. There is no need to change any switch settings
from the default settings.
RS422 User: Change the mode pin to “422” positions(ON). Keep
the other settings unchanged.
Switch Description:
Switch
Pin#
Switch Name
(Switch States)
Switch Positions
Description
1
485/422
(OFF/ON)
485
(Default)
2-wire RS485 mode
422
4-wire RS422 mode
2
ECHO/NO ECHO
(OFF/ON)
ECHO
Transmitting data will be
echoed back
NO ECHO
(Default)
No echo data
3
NO TERM/TERM
(OFF/ON)
NO TERM
(Default)
Termination Resistor is
Disabled
TERM
Termination Resistor is
Enabled
4
RVD
(OFF)
Reserved for Future Use
(ON)
Reserved for Future Use
Please note that if the mode were set at “422” mode, the ECHO setting
will take no effect.
The Echo mode is useful for the application program to detect if the
RS485 bus were in a collision. If the echoed data was not equal to the
transmitted data, then the bus was in a collision.
The RS422/485 Adapter Cable can be hot-plugged to the USB port of
your computer due to the specifications of USB. It supports the
following operating systems. The drivers are shipped in the
corresponding folder on the supplied driver CD. If you are installing
drivers for Win98, ME, 2000, 2003, XP or Vista, when prompted for the
3. Installing Drivers
2. Switch Settings
