VEGA VEGASCAN 850 Modbus signal output - Manual (Page 3)

Modbus signal output VEGASCAN 850 3
1 Configuration of the Modbus in-
terface
With the adjustment software VEGA Visual
Operating (VVO), the configuration of the
Modbus interface can be carried out on
VEGASCAN 850. Provide a connection be-
tween PC with VVO and VEGASCAN 850 with
the RS 232 interface cable. The following
illustration is displayed on the PC after
switching on VEGASCAN 850 and starting
VVO.
• Click to "
Configuration“, then to "Measuring
system“, in the next window "Configuration
measuring system“ click to "
Communica-
tion.
The window " Configuration Modbus“ opens.
Here, you select the protocol mode (Mod-
bus-RTU or Modbus-ASCII). For the baud
rate (300 … 38400), you must make sure that
the rate is set to the same value as the other
BUS participants. For the BUS address,
settings 1 to 246 are permitted. Address
adjustments outside this range are converted
as follows:
Addr. 0 becomes addr. 245
Addr. > 247 becomes addr. 245
Addr. 255 becomes addr. 246.
• After the configuration settings, click to
"
Save“, then to "Quit“. In the window "Con-
figuration measuring system“ click again to
"
Quit“.
BUS termination
(only with RS 485 interface)
When connecting VEGASCAN to the begin-
ning or end of the Modbus chain, the instru-
ment has to be terminated. Set the slide
switch (beside the field bus terminal) to posi-
tion "on“.
After setting up the Modbus interface, pro-
vide the connection with the Modbus. In case
of correct communication, the green LED
marked "BA“ in the front plate of VEGASCAN
lights.
Configuration of the Modbus interface