Modbus driver for labview

Hello

Has anyone used driver to connect to a device using RTU on RS232 Modbus labview?

I have a camera that I need to send messages and I tried to use the labview OR to that effect drivers.

I used 'Query.vi Mo series Master' to send a message.

But, I don't know what it would take as input in this vi to frame the message using the RTU Protocol.

Also, I wrote a program to calculate the CRC for an input string. I don't know where to give that as input for this vi add the CRC to the frame of the message.

The vi automatically calculates the CRC?

I am attaching the document for the device in which talks about pages 106-117 to develop an application to control the unit.

Can someone tell me please how to use modbus for this driver? The document in support of this driver gives me a lot of information.

Thank you

VJ

The modbus VI automatically calculate the CRC for you.  Right-click on the inputs to the Modbus VI query and select Create constants.  The constants will be the clusters for the necessary data.  The key parameters are Modbus slave address, command, address,...

Note that registry modbus addresses may or may not be moved by 1.  So address 1 in the manual might actually be the address 0 in the Modbus VI.

Tags: NI Software

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