Modbus RTU via VB

Hi, You can write serial communication routines using MSCOMM controls in VB. And then there are just two things to be solved: Modbus RTU protocol definitions and CRC calculation. for Modbus info: and below is a simple code for CRC calculation you'll need. Good Luck. Tarik

srinivas duddu

Hi!!, Please let me know if any code samples are available in VB to communicate with a modbus device. I am badly in need to communicate to a gas analyser supporing MODBUS RTU. Anybody pls, let me know the possibilities of getting the communication work. I tried with the MODTEST utility program and it works, but when i tried to send the same query using MSCOMM control in VB it doesnt work . what could be the problem ?