ADEUNIS LoRaWAN MODBUS MASTER Guide Utilisateur page 67

LoRaWAN MODBUS MASTER - Guide utilisateur / User guide version V1.0.0
Description of the frame :
• Bytes 2 to 3 : value of the first register in the order of the configuration defined in registers 330 à 339
• Bytes 4 to 5 : value of the second register in the order of the configuration defined in registers 330 à 339
• ...
• Bytes 48 to 49 : value of the 24 register in the order of the configuration defined in registers 330 à 339
Using the configuration example in paragraph 2.2.1 as follows:
Register Value encoding
S301 Decimal
S322 Decimal
S330 Hexadecimal
S331 Hexadecimal
The result frame is:
0 1
Code Status
0x44 Cf Status
0x44 0xB3
In the example in grey this gives:
• Bytes 2 to 3: the Modbus register 0x1518 of slave 0x01 is 0x1234
• Bytes 4 to 5: the Modbus register 0x1519 of slave 0x01 is 0x5A20
• Bytes 6 to 7: the Modbus register 0x0ED8 of slave 0x57 is 0x3F41
• Bytes 8 to 9: the Modbus register 0x0ED9 of slave 0x01 is 0x6D72
• Bytes 10 to 11: the Modbus register 0x0EDA of slave 0x01 is 0xE042
• Bytes12 to 13: the Modbus register 0x0EDB of slave 0x01 is 0x0025
Value
180
200
0x01151802
0x570ED814
2 to 3 4 to 5
Modbus regis- Modbus regis-
ter 0x1518 of ter 0x1519 of
slave 0x01 slave 0x01
0x1234 0x5A20
Result
Periodic mode with a period of 180x20s = 3600 seconds = 1h
The supply time of the external load (slave) before the Modbus
request is 200x100 = 20000ms ie 20s
Periodic data 1 configuration:
• Slave address = 0x01
• First register address = 0x1518
• Modbus registers type : holding registers
• Number of registers = 2
Periodic data 2 configuration:
• Slave address = 0x57
• First register address = 0x0ED8
• Modbus registers type : input registers
• Number of registers = 4
6 to 7 8 to 9
PAYLOAD
Modbus regis- Modbus regis-
ter 0x0ED8 of ter 0x0ED9 of
slave 0x57 slave 0x57
0x3F41 0x6D72
10 to 11 12 to 13
Modbus regis- Modbus regis-
ter 0x0EDA of ter 0x0EDB of
slave 0x57 slave 0x57
0xE042 0x0025
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