Adeunis RF LoRaWAN MODBUS MASTER ARF8240AA, Руководство пользователя, Страница: 53 / 80

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sigfox MODBUS MASTER - Guide utilisateur / User guide version V1.0.1
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There will be as many alarm frames transmitted as VALUE s 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 (register 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 VALUE Result
S320 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
S340 Hexadecimal 0x0A106827 Alarm 1 configuration:
• Slave address = 0x0A
• First register address = 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)
S341 Hexadecimal 0x00124F80 High threshold of alarm 1 is 1,200,000 (decimal)
S342 Hexadecimal 0x2710 Hysteresis of high threshold of alarm 1 is 10,000 (decimal)
S343 Hexadecimal 0x00061A80 Low threshold of alarm 1 is 400,000 (decimal)
S344 Hexadecimal 0x2710 Hysteresis of low threshold of alarm 1 is 10,000 (decimal)
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.
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 VALUE Result
S300 Decimal 72 The Keep Alive frame is sent every:
72x10=720min i.e. 12h (or twice per
day)
Product in standby
Send frame 0X30
Period
reached?
Yes
No
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: