Using a HP VEE Program to Control your Instrument
through Modbus RTU protocol
HP VEE is a very powerful and
convenient graphical programming software to control instruments, more and more
devices use the Modbus RTU protocol for Serial Communications. This is why ESS,
Inc. has developed HP VEE programs to use with its temperature controllers for
chart-recording, PID setting and setup. Thanks to its experience, ESS, Inc. now
offers a Data Acquisition HP VEE Panel to work with any Modbus RTU
instrument.
Download the
HP VEE Modbus Package (Free
Self-Extracting ZIP File 98 KB )
This package contains:
-Three HP VEE programs, modbus_reader.vee, modbus_writer.vee and an example of
utilization Panel_Modbus.vee.
Among these vee files, you could find three HP VEE UserObjects, which are a
reading and two writing routines (write positive and negative values). As they
require Modbus registers in the decimal format and they return read values in
decimal format too, you can insert these routines in your programs to
communicate with your Modbus device. The routines take care of splitting the
register or value in a high byte and low byte if necessary (for high or negative
numbers).
  
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