EN
sigfox MODBUS MASTER - Guide utilisateur / User guide version V1.0.1
51
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FR
2.2. Application operation
2.2.1 Periodic transmission
The product allows the measurement and the periodic transmission of the VALUE s of the sensors according to the following diagram:
The parameters associated with this mode of operation are:
• Transmission period (register S301).
• External load supply time before the Modbus request (register 322)
• Definition of periodic data (registers S330 to S339)
The complete list of registers can be found in paragraph 3.4.
Example:
Register
VALUE encoding
VALUE
Result
S301
Decimal
180
Periodic mode with a period of 180x20s = 3600 seconds =
1h
S322
Decimal
200
The supply time of the external load (slave) before the
Modbus request is 200x100 = 20000ms ie 20s
S330
Hexadecimal
0x01151802
Periodic data 2 configuration:
• Slave address = 0x01
• First register address = 0x1518
• Modbus registers type : holding registers
• Number of registers = 2
S331
Hexadecimal
0x570ED814
Periodic data 2 configuration:
• Slave address = 0x57
• First register address = 0x0ED8
• Modbus registers type : input registers
• Number of registers = 3
Product in standby
Read slave register (s)
Send frame 0x44
Period
reached?
Yes
No