VIPER Technical Manual

Connectors, LEDs and jumpers

 

 

RS485/422 configuration – LK4, LK5, LK6 and LK7 on JP1

VL

These jumpers are used to enable/disable the RS485 receive buffer and RS485/422

line termination. See COM5436H– RS422/485 interface, page 65437H, for more details.

LK4 Description

(RS485 TX/RX) RS422 TX line

Default setting:

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

RS422 full-duplex.

Default setting:

Default setting:

RS485 half-duplex.

Only fit LK4 and LK5 if the VIPER is at the end of the network.

© 2007 Eurotech Ltd Issue E

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