Arcom VIPER - Page 71

VIPER Connectors, LEDs and jumpers
RS485/422 configuration – LK4, LK5, LK6 and LK7
These jumpers are used to enable/disable the RS485 receive buffer and RS485/422
line termination, see COM5 – RS422/485 interface
, page 46, for more details.
This jumper can be used by an application program to signify a configuration setting.
LK4 Description
(RS485 TX/RX) RS422 TX line
termination resistor (120Ω) connected.
(RS485 TX/RX) RS422 TX line
termination resistor (120Ω)
disconnected.
LK5 Description
RS422 RX line termination resistor
(120Ω) connected.
RS422 RX line termination resistor
(120Ω) disconnected.
LK6 & LK7 Description
RS485 half-duplex.
RS422 full-duplex.
Only fit LK4 and LK5 if the VIPER is at the end of the network.
B
A
B
A
Default setting:
B
A
Default setting:
Default setting:
© 2004 Arcom Issue H 71