The Plasmionique Modbus Master Library is an open-source add-on package for LabVIEW. It implements the Modbus Application Protocol Specification V1.1b3 for communicating with Modbus devices (slaves) over Asynchronous Serial or TCP/IP networks. Plasmionique Inc. developed it to replace NI’s Modbus V1.2.1 and provide an open source alternative to the Modbus API released by NI labs.
It supports RTU, ASCII, and TCP modes with the following function codes:
0x01 - Read Coils
0x02 - Read Discrete Inputs
0x03 - Read Holding Registers
0x04 - Read Input Registers
0x05 - Write Single Coil
0x06 - Write Single Register
0x07 - Read Exception Status
0x0F - Write Multiple Coils
0x10 - Write Multiple Registers
0x16 - Mask Write Register
0x17 - Read/Write Multiple Registers
0x2B/0x0E - Read Device Identification
The Plasmionique Modbus Master Library supports sharing a COM port across multiple Modbus sessions using VISA locks (10-second timeout).
It also supports sharing a Modbus session across multiple communication loops using a DVR as a mutex.
Support Information
This product is supported by the third-party provider and not by NI. For more information, contact Plasmionique at:
Website: plasmionique.com
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