Chengdu Ebyte Electronic Technology Co.,Ltd E840-DTU(4G-02E) User Manual
Copyright ©2012–2019
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Chengdu Ebyte Electronic Technology Co.,Ltd
5、Modbus RTU and Modbus TCP are mutually converted;
E840-DTU(4G-02E) supports the mutual conversion between Modbus RTU and ModbusTCP. After the function is
enabled, after receiving the data, the device will detect whether the data meets the Modbus RTU or ModbusTCP
protocol. If it meets the requirement, the conversion function is enabled. Otherwise, it will output/send original
data.
a) For example, the serial port receives the ModbusT RTU write-out command in the following format (hexadecimal):
01 06 00 01 00 01 19 CA (ModbusT RTU), when the conversion function is enabled, the data received by the server
is: 00 00 00 00 00 06 01 06 00 01 00 01 (ModbusT TCP)
b) When the data received by the network is: 00 00 00 00 00 06 01 06 00 01 00 01 (ModbusT TCP), the serial port of the
device will output the data : 01 06 00 01 00 01 19 CA (ModbusT RTU);
Note: In the Modbus TCP standard protocol, the transaction element identifier needs to be specified. In E840-DTU-
(4G-02E), the user can configure the value through AT+MTCPID, and when the value is configured to 0, the
receiving end All data conforming to the Modbus TCP protocol will be parsed, otherwise only packets with the
same application packet identifier and device configuration identifier will be converted.
6、Base station positioning function;
The E840-DTU(4G-02E) supports the base station positioning function. The user can send the AT+LBS command
in the AT mode to read the current LBS information of the device. The device returns the data format as follows:
+OK=LAC,xxxx;CID,xxxx, where LAC is the unique identification number of the global cell, CID is the base
station number, (xxxx is the hexadecimal value);
The LAC and CID number can be used to query the current location information of the device. For the query
method, refer to the link: http://www.gpsspg.com/bs.htm
7、Serial port packaging function;
The E840-DTU(4G-02E) serial port break time and packing length can be configured. The user can configure the
frame break time and the package length through the AT+UARTTS command. Please refers to the AT command for the
specific configuration.
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