Adeunis RF LoRaWAN MODBUS MASTER ARF8240AA, Руководство пользователя, Страница: 65 / 80

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sigfox MODBUS MASTER - Guide utilisateur / User guide version V1.0.1
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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 0x57 is 0x6D72
• Bytes 10 to 11: the Modbus register 0x0EDA of slave 0x57 is 0xE042
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 1 2 3 to 4 5 to 6 (7 to 8)
Code Status PAYLOAD
0x45 Cf Status Modbus slave
address
Modbus register
address
VALUE of Modbus
register 1
(VALUE of Modbus
register 2)
0x45 0xB1 0x0A 0x1068 0x0001 0xD4CF
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.
Description of the frame:
• Byte 2: Modbus slave address
• Bytes 3 to 4: Modbus register address
• Bytes 5 to 6: VALUE of Modbus register 1
• Bytes 7 to 8: 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 Description Sending conditions
0x10 Frames of information on the product
configuration • Product start-up
• Exit from the configuration mode (AT Command)
• Reception of a downlink frame 0x01
0x20 Frames of information on the network
configuration • Product start-up
• Exit from the configuration mode (AT Command)
• Reception of a downlink frame 0x02
0x30 Keep Alive frame • Product start-up
• Periodically if no periodic data configured. The reference
period is defined by register 300.
0x31 Reply frame to a register VALUE request • Reception of a downlink frame 0x40
0x44 Periodic data frame • Product start-up
• Transmission period reached (period defined by register S301)
0x45 Alarm frame • During the appearance or disappearance of a threshold
exceeding alarm (depending on the configuration of registers
340 to 389).