Chengdu Ebyte Electronic Technology Co.,Ltd
E851-RTU(4440-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co.,Ltd
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4. Product Function
4.1. Working mode
The working mode has host mode and slave mode, which is configured by Modbus register 40081 (0x0050). It will be
Host mode when the register value is 0; slave mode when the register value is 1, default slave mode.
4.1.1.Slave mode
In slave mode (register value 0x01), the data sent to the device by the network or 485 terminal (sender) satisfies the
Modbus RTU, Modbus TCP protocol, and the address in the data is the device address, and the device will reply with the
same protocol. If the data sent by the network or 485 bus to the device does not satisfy the Modbus RTU, Modbus TCP
protocol, or the Modbus RTU or Modbus TCP protocol is met but the data address is not the device address, the data of
the sender will be discarded.
In slave mode, the device can connect to the device in host mode directly through 485 bus, so that the data of slave can
also be accessed by the network terminal when the slave is not connected to the network.
