Transmission Of A Daily Keep Alive Frame - ADEUNIS LoRaWAN MODBUS MASTER Guide Utilisateur

LoRaWAN MODBUS MASTER - Guide utilisateur / User guide version V1.0.0
There will be as many alarm frames transmitted as values read on the slave registers exceeding the configured thresholds.
The settings associated with this mode of operation are:
• Acquisition period (register S320)
• Supply time of the external load (slave) before the Modbus request (registre 322)
• Alarms configuration (registers 340, 345, 350, 355, 360, 365, 370, 375, 380, 385).
• High threshold alarms (registers 341, 346, 351, 356, 361, 366, 371, 376, 381, 386).
• Hysteresis of high threshold alarms (registers 342, 347, 352, 357, 362, 367, 372, 377, 382, 387).
• Low threshold alarms (registers 343, 348, 353, 358, 363, 368, 373, 378, 383, 39).
• Hysteresis of low threshold alarms (registers 344, 349, 354, 359, 364, 369, 374, 379, 384, 389).
The complete list of registers can be found in paragraph 3.4.
E.g.:
Register Value encoding
S320 Decimal
S322 Decimal
S340 Hexadecimal
S341 Hexadecimal
S342 Hexadecimal
S343 Hexadecimal
S344 Hexadecimal
IMPORTANT : alarms and thresholds are set to a maximum of 4 bytes (ie 2 maximum Modbus registers). For a value defined on a register
one can choose the data type between unsigned or signed 16-bit integer. For a value defined on 2 registers one can choose the type of data
between unsigned or signed 32-bit integer.

2.2.3 Transmission of a daily Keep Alive frame

If the product has no periodic data configured, a Keep Alive frame
(0x30) is transmitted regularly according to the following diagram:
The settings associated with this mode of operation are:
• The setting of the period of transmission of the Keep Alive frame (register 300).
The complete list of registers can be found in paragraph 3.4.
E.g.:
Register Value
encoding
S300 Décimal
Value
180
200
0x0A106827
0x00124F80
0x2710
0x00061A80
0x2710
Value Result
72 The Keep Alive frame is sent every:
72x10=720min i.e. 12h (or twice per
day)
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
Alarm 1 configuration:
• Slave address = 0x0A
• First register adress = 0x1068
• Data type : 32-bit unsigned integer (bits 4 and 5 = 2)
• Modbus register type: input registers (bit 2 = 1)
• Active thresholds: low and high (bits 0 à 1 = 3)
High threshold of alarm 1 is 1,200,000 (decimal)
Hysteresis of high threshold of alarm 1 is 10,000 (decimal)
Low threshold of alarm 1 is 400,000 (decimal)
Hysteresis of low threshold of alarm 1 is 10,000 (decimal)
Product in standby
Non
Period
reached?
Oui
Send frame 0X30
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