ABB VSN800 Product Manual page 8

3. The RS485 line must be terminated with a 120-ohm resistor. If the device is the only
device in the chain or at the end of the chain, you must set the jumper (J8) to
terminate the RS485 line. The factory setting for RS485 line termination is OFF.
4. Placement can be other than the end of the chain if the RS485 termination is disabled.
To locate the device in the middle of a daisy chain, set the jumper at location J8
between the pins Common and Off to disable RS485 termination.
VSN800-14
Weather Station Electronics Board, Jumper for RS485 Termination
The default address of the weather station is 60. Contact Customer Support if it is required to
change the address. You cannot have two weather stations in the same RS 485 chain unless
the address of one of the weather stations is changed.
RS485 Terminals
Terminal Label
RS485 A (-)
RS485 B (+)
GND:
RS-485 Shield
SunSpec and Modbus Communication Settings
Variable
Default Modbus ID
Jumper J8:
Jumper Common to On:
RS485 Termination
Jumper Common to Off:
No RS485 Termination
RS485 Connectors:
RS-485 A (-)
RS-485 B (+)
RS-485 GND
RS-485 Shield
RS485 Signal
Negative RS485
Positive RS485
Signal Ground
Shield Ground
Value
60
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VSN800 Weather Station Product Manual
VSN800-12