Has the MODBUS RTU to MODBUS TCP protocol of the ZP-8621/8404 series Modbus gateway module produced by our company changed? In fact, this problem most often occurs in industrial automation, especially in applications such as PLC and instrumentation. As the developer of MODBUS products, we can answer this question accurately. When the device is MODBUS rtU protocol, it must be converted to Modbus TCP to link the computer or server. In this process, the data format has changed. Because the data packet format of MODBUS RTU is different from that of MODBUS TCP, the check bit has also changed, and the running data function and protocol have also changed accordingly. When using ZP-8621/ZP-8404 serial server, there is a built-in MODBUS RTU to MODBUS TCP data packet conversion function in the module. Because ZP-8621/ZP-8404 RS485 to Ethernet has protocol conversion transmission, it involves the conversion function of protocol layer and application layer.
ZP-8621/ZP-8404 Modbus gateway module, serial port conforms to RS232/485/422 protocol and TCP/IP/Ethernet Ethernet protocol conversion standard; supports ModbusRTU, ModbusASCII, ModbusTCP/IP, ModbusTCP to Modbus RTU, Modbus RTU to ModbusTCP, etc. protocol. Products can span gateways, routers, external networks, local area networks, link industrial Ethernet switches, optical fiber network serial ports three-in-one devices, and related network communication products.
modbus rtu to modbus tcp：http://www.zxpmq.cn/dw.html
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