2192-12132-000-000
LK1 – Reset
A momentary switch (push to make) may be connected to LK1, when the button is pressed it will
put the board into a full hardware reset. Once the jumper is open circuit, the board will start
executing from the top of memory.
LK2 – User Configurable Jumper 1
This jumper has no reserved function on the VIPER, but can be used by an application program
to signify a configuration setting.
LK2
Description
Fit+
Read as ‘0’
Omit
Read as ‘1’
LK3 – User Configuration Jumper 2
This jumper has no reserved function on the VIPER, but can be used by an application program
to signify a configuration setting.
LK2
Description
Fit+
Read as ‘0’
Omit
Read as ‘1’
LK4, LK5, LK6 and LK7 – RS485/422 configuration
These jumpers are used to configure the RS485/422 serial interface. They can be used to
enable/disable the RS485 receive buffer and RS485/422 line termination (see the RS485/422
section for more details).
LK4
Description
Fit+
RS422 TX line termination resistor (120
Ω
) connected
Omit
RS422 TX line termination resistor (120
Ω
) disconnected
LK5
Description
Fit+
RS485 (RS422 RX line) termination resistor (120
Ω
) connected
Omit
RS485 (RS422 RX line) termination resistor (120
Ω
) disconnected
LK6 &
LK7
Description
A+ RS485
Half-duplex
B RS422
Full-duplex
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