Product Function; Working Mode; Slave Mode; Master Mode - Ebyte E821-RTU User Manual

Table of Contents

Chengdu Ebyte Electronic Technology Co.,Ltd

4. Product Function

The working mode has master mode and slave mode, which are configured by Modbus register 40081 (0x0050).

When the register value is 0, it is the master mode; when the register value is 1, it is the slave mode, and default is the

4.1.1 Slave mode

In slave mode (register value is 0x01), the data sent to the device by network or 485 bus (sender) conforms to

Modbus RTU or Modbus TCP protocols, and the address in the data is the device address. The device will respond to the

sender with the same protocol. If the data sent to the device by the network end or 485 bus end does not conform to the

Modbus RTU or Modbus TCP protocol, or meets the Modbus RTU or Modbus TCP protocol, but the data address is

different from that of the device, the data will be discarded.

In the slave mode, the device can directly connect to the device in master mode through the 485 bus. When the slave

is not connected to the network, the network can also access the data of the slave through the master.

In slave mode (register value is 0x00), the data sent to the device by network or 485 bus (sender) conforms to

Modbus RTU or Modbus TCP protocols, and the address in the data is the device address. The device will respond to the

sender with the same protocol. If the data sent to the device by the network end or 485 bus end does not conform to the

Modbus RTU or Modbus TCP protocol, or meets the Modbus RTU or Modbus TCP protocol, but the data address is

different from that of the device, the data of 485 bus will be transmitted to the network, and the data on the network will

be transmitted to 485 bus.

This function of host mode can realize the cascade function of devices and the data transmission between 485 bus

and network.

E821-RTU (0400-ETH)User Manual

Table of Contents