
VIPER Technical Manual
Connectors, LEDs and jumpers
© 2007 Eurotech Ltd Issue E
99
RS485/422 configuration – LK4, LK5, LK6 and LK7 on JP1
These jumpers are used to enable/disable the RS485 receive buffer and RS485/422
line termination. See
, for more details.
LK4 Description
(RS485 TX/RX) RS422 TX line
termination resistor (120
Ω
) connected.
(RS485 TX/RX) RS422 TX line
termination resistor (120
Ω
)
disconnected.
LK5 Description
RS422 RX line termination resistor
(120
Ω
) connected.
RS422 RX line termination resistor
(120
Ω
) disconnected.
LK6 & LK7
Description
RS422 full-duplex.
RS485 half-duplex.
Only fit LK4 and LK5 if the VIPER is at the end of the network.
VL
Default setting:
Default setting:
Default setting: