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8-Port RS422/485 Serial PCI Card
3. Jumper Settings
RS485 User: Since the factory jumper settings are initially set at
2-wire RS485 mode. There is no need to change any jumper
settings from the default settings.
RS422 User: Change the mode jumper away from the "485"
position. Keep the other settings unchanged.
1. Mode Jumpers:
S2H
ECHO
S1H
485
Mode Settings for all S1~S8 Ports (JP1):
Jumper Name
S2H/S2L
ECHO/NO ECHO
S1H/S1L
422/485
Please note that if the mode were set at "422" mode, the ECHO settings
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.
2.
S1~S8 Termination Resistor Enable/Disable Jumpers
(JP4,JP6,JP8,JP10,JP5,JP7,JP9,JP11):
NO ECHO
Jumper Positions
S2L
(Default)
ECHO
NO ECHO
(Default)
S1L
(Default)
485
(Default)
422
2
S2L
S1L
422
Mode and Termination Resistor
Setting
Reserved for Future Use. Please do
NOT change it.
Transmitting data will be echoed
No echo data
Reserved for Future Use. Please do
NOT change it.
2-wire RS485 mode
4-wire RS422 mode
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