E850-DTU(4440-GPRS) datasheet
Copyright ©2012–2018
，成都亿佰特电子科技有限公司
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4.1.2 Master mode
In Master mode (register value is 0x00), the data sent by the network or 485 bus (sender) to the
device conforms to the Modbus RTU, Modbus TCP protocol, and the address in the data is the device
address, and the device responds to the sender with the same protocol. If the data sent by the
network or 485 bus to the device does not comply with the Modbus RTU, Modbus TCP protocol, or
even if the Modbus RTU and Modbus TCP protocols are met, but the data address is not the device
address, the data transmitted from the 485 bus will be transmitted to the network, the data transmitted
from the network will be transmitted to the network 485 bus.
This function of the host mode enables device cascading and data transfer between the 485 bus
and the network.
