Io Basic Functions - Ebyte E851-RTU Series User Manual

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Chengdu Ebyte Electronic Technology Co., Ltd.

the data from the 485 bus will be transmitted to the network The data from the network will be transmitted to the 485 bus.

This function of the host mode can realize the device cascading function and the data transmission between the 485 bus and the

network.

4.2 IO basic functions

4.2.1 Digital DO output

4.2.1.1 Read switch DO output

Function code: 01, read coil status

Address range: 00017(0x0010)~00020(0x0013)

Explanation: When the device relay is passive output, when the coil is not powered, the NC port and COM port of the relay are

normally closed, and the NO port and COM port are normally open, and the value is 0; when the coil is powered on, the phenomenon

is opposite, and the relay NC port and COM port are disconnected. Open, the NO port and the COM port are closed, and the value is 1.

Query the status of the relay through the command.

example:

Read the 4-way switching output status, assuming the return value is 03, corresponding to the binary digits 0000 0011, the lower

four bits represent the switching output status, which are DO4, DO3, DO2, DO1 in sequence.

Modbus RTU protocol to read switch output:

send

Device ModBus address

00 10

function

switch start address

code

E851-RTU(4440-ETH) User Manual

00 04

Read switch quantity

CRC check code

3C 0C

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