
Robotiq 2-Finger Adaptive Gripper
Instruction Manual
Robotiq inc. © 2016
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4.7 MODBUS RTU communication
The Gripper can be controlled by Modbus RTU directly with RS485 or over USB using the ACC-ADT-USB-RS485. This section is intended to provide
guidelines for setting up a Modbus scanner that will adequately communicate with the Gripper.
For a general introduction to Modbus RTU and for details regarding the CRC algorithm, the reader is invited to read the Modbus over serial line specification
and implementation guide available at:
http://www.modbus.org/docs/Modbus_over_serial_line_V1.pdf
For debugging purposes, the reader is also invited to download one of many free Modbus scanners such as the CAS Modbus Scanner from Chipkin
Automation Systems available at:
http://www.chipkin.com/cas-modbus-scanner
.
Info
Modbus RTU is a communication protocol based on a Big Endian byte order. Therefore, the 16-bit register addresses are transmitted with the
most significant byte first. However, the data port is in the case of Robotiq products based on the Little Endian byte order. As such, the data parts
of Modbus RTU messages are sent with the less significant byte first.