GSM/GPRS/3G/4G/NB-IoT
Sensor To Cloud IoT Series
Page 29 of 37
King Pigeon Hi-Tech. Co., Ltd
Ver 1.1
9.19.
Reboot Device
Instructions
Return
Remote restart
PREBOOT
Reboot successfully
9.20.
Restore factory settings
Instructions
Return
Restore factory settings
PRESET
Reset successfully!
9.21.
Set device language
Instructions
Return
Set to Chinese
PCH
中文
Set to English
PEN
English
10.
Transmission protocol
This product supports the transmission of data to the server via the network and supports the Modbus
RTU and MQTT protocols. Reference is made to the specific communication rules of the Modbus RTU
protocol and the MQTT protocol.
10.1.
Modbus RTU protocol
The Modbus RTU protocol used in this product is essentially a transmission of a Modbus RTU
communication instruction on the basis of the TCP or UDP protocol.The device is a TCP/UDP client.
10.1.1. Modbus address and example of DO types
Register address
Definition
Data type
Function code
Data description
0
DO output state
bit
1 / 5
0 is open, 1 is close
Example:
Server query DO status Modbus message (Hexadecimal representation): 01 01 00 00 00 01 FD CA
Issue data
Detailed description
01
Device ID address
01
Function code 01, reading DO state
00 00
Reads data from the device register address, 00 00