Periodic Data Frame - ADEUNIS sigfox MODBUS MASTER Guide Utilisateur

sigfox MODBUS MASTER - Guide utilisateur / User guide version V1.0.0
• Response frame (0x31) from the product:
0 1
Code PAYLOAD
0x31 Status
In this example: CONFID1 is a 2-byte register, CONFID2 a 1-byte register and CONFID3 a 2-byte register.
FR
If an error is detected in the request, the returned 0x31 frame will be empty.

4.1.6 Periodic data frame

This frame (0x46) is transmitted at the frequency defined in register S301 and contains all the configured Modbus periodic data.
The organization of the bytes in this frame therefore depends on the configuration of the user by following the scheduling of the defined
MODBUS frames.
EN
This frame has a maximum of 5 2-byte registers.
0
Code PAYLOAD
0x44 Cf Status
Its size is of 12 bytes.
Description of the frame :
• Bytes 2 to 3 : value of the first register in the order of the configuration defined in registers 330 to 334
• Bytes 4 to 5 : value of the second register in the order of the configuration defined in registers 330 to 334
• ...
• Bytes 10 to 11 : value of the fifth register in the order of the configuration defined in registers 330 to 334
Using the configuration example in paragraph 2.2.1 as follows:
Register
S301
S322
S330
S331
The result frame is:
0
Code
0x44
0x44
2 3
VALUE1 VALUE1
1 2 to 3 4 to 5
Modbus Modbus
register 1 register 2
Value encoding
Decimal
Decimal
Hexadecimal
Hexadecimal
1 2 to 3
Status
Cf Status Modbus register
0x1518 of slave
0x01
0xB1 0x1234
4 5 ...
PAYLOAD
VALUE2 VALUE3 VALUE3
6 to 7 8 to 9
PAYLOAD
Modbus Modbus
register 3 register 4
Value Result
180 Periodic mode with a period of 180x20s = 3600 seconds =
1h
200 The supply time of the external load (slave) before the
Modbus request is 200x100 = 20000ms ie 20s
0x01151802 Periodic data 1 configuration:
• Slave address = 0x01
• First register address = 0x1518
• Modbus registers type : holding registers
• Number of registers = 2
0x570ED814 Periodic data 2 configuration:
• Slave address = 0x57
• First register address = 0x0ED8
• Modbus registers type : input registers
• Number of registers = 4
4 to 5 6 to 7
PAYLOAD
Modbus register Modbus register
0x1519 of slave 0x0ED8 of slave
0x01 0x57
0x5A20 0x3F41
11
X
10 à 11
Modbus
register 5
8 to 9
Modbus register Modbus register
0x0ED9 of slave 0x0EDA of slave
0x57 0x57
0x6D72 0xE042
10 to 11
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