Product Function Introduction; Ao Output; Ao Output Range; Modbus Gateway - Ebyte ME31-XXXA0006 User Manual

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IV. Product Function Introduction

4.1 AO output

4.1.1. AO output range

Analog output (AO), the current output type can be configured as 0~20mA or 4~20mA, the precision is 3‰,
and the resolution is 16 bits.
The power-on default output value can be set (when the working mode is switched, the power-on value will be
output according to the lowest value of the current range).

4.2 Modbus Gateway

The device can transparently transmit non-native Modbus commands from the network/serial port to the serial
port/network, and the local Modbus commands are directly executed.

4.2.1. Modbus TCP/RTU protocol conversion

After it is turned on, the Modbus TCP data on the network side will be converted to Modbus RTU data.

4.2.2. Modbus Address Filtering

This function can be used when some host software or configuration screen is used as the host to access the
serial port of the device, and the gateway function of the device is used, the slave is at the network end, and the
Modbus TCP to RTU function is turned on. Multiple slaves on the bus may cause data confusion. At this time,
enabling address filtering can ensure that only the specified address can pass through the device; when the
parameter is 0, the data will be transparently transmitted; when the parameter is 1-255, only the set slave machine
address data.

4.2.3. Modbus TCP Protocol Data Frame Description

TCP frame format：
Transaction ID
2 Bit
 Transaction ID: It can be understood as the serial number of the message. Generally, 1 is added after each
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Protocol ID Length
2 Bit N+2 Bit
Device address Function code
1 Bit 1 Bit
ME31-XXXA0006_UserManual_EN
Data segment
N Bit
14