Modbus-Tcp Communication Format - UFactory xARM VACUJM GRIPPER User Manual

Modbus-TCP Communication Format

3.4.1.
Modbus-TCP:
Modbus protocol is an application layer message transmission protocol,
including three message types: ASCII, RTU, and TCP. The standard
Modbus protocol physical layer interface includes RS232, RS422, RS485
and Ethernet interfaces, and adopts master / slave communication.
Modbus TCP Communication Process:
1. Establish a TCP connection
2. Prepare Modbus messages
3. Use the send command to send a message
4. Waiting for a response under the same connection
5. Use the recv command to read the message and complete a data
exchange
6. When the communication task ends, close the TCP connection
Parameter:
Default TCP Port: 502 Protocol: 0x00 0x02
On the problem of users using communication protocols to organize
data in big endian and little endian:
In this article, data analysis is big-endian analysis.
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