Alarm Frame; Summary Of The Conditions Of The Transmission Of The Uplink Frames - ADEUNIS LoRaWAN MODBUS MASTER Guide Utilisateur

LoRaWAN MODBUS MASTER - Guide utilisateur / User guide version V1.0.0

4.1.7 Alarm frame

This frame (0x45) is sent during the appearance or disappearance of a threshold exceeding alarm (depending on the configuration of registers
340 to 389).
0
Code
FR
0x45
0x45
Its size has a maximum of 9 bytes when the register is compared to a 32-bit threshold, else the last column (bytes 7 to 8) is empty.
EN
Description of the frame:
• Bytes 2 to 3: Modbus slave address
• Bytes 4 to 5: Modbus register address
• Bytes 4 to 5: Value of Modbus register 1
• Bytes 4 to 5: Value of Modbus register 2 (if the register is compared to a 32-bit threshold)
In the example in grey this gives:
• Byte 2: Modbus slave address is 0x0A
• Bytes 3 to 4: Modbus register address is 0x1068
• Bytes 5 to 6: Value of Modbus register 1 is 0x0001
• Bytes 7 to 8: Value of Modbus register 2 is 0xD4CF
The compared register, recomposed on 32 bits, is 0x0001D4CF ie 120,015 in decimal.

4.1.8 Summary of the conditions of the transmission of the uplink frames

The table below summarizes the conditions of the transmission of the different uplink frames:
Code
0x10
0x20
0x30
0x31
0x44
0x45
1 2
Status
Cf Status Modbus slave
address
0xB3 0x0A
Description
Frames of information on the product confi-
guration
Frames of information on the network
configuration
Keep Alive frame
Reply frame to a register value request
Periodic data frame
Alarm frame
3 to 4 5 to 6
PAYLOAD
Modbus register Value of Modbus
address register 1
0x1068 0x0001
Sending conditions
• Product start-up
• Exit from the configuration mode (AT Command)
• Reception of a downlink frame 0x01
• Product start-up
• Exit from the configuration mode (AT Command)
• Reception of a downlink frame 0x02
• Product start-up
• Périodically if no periodic data configured. The reference
period is defined by register 300.
• Reception of a downlink frame 0x40
• Product start-up
• Transmission period reached (period defined by register S301)
• During the appearance or disappearance of a threshold
exceeding alarm (depending on the configuration of registers
340 to 389).
(7 to 8)
(Value of Modbus
register 2)
0xD4CF
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