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sigfox MODBUS MASTER - Guide utilisateur / User guide version V1.0.0
4.2.4 Frame for updating the value of specific registers
This frame (0x41) allows to change the value of requested registers.
0
Code
0x41
CONFID1
FR
Description of the frame :
•
Byte 1: CONFID1 (8bits) : indice of the first register to change. The corresponding register is 300 + value of CONFIDX. For example, if
CONFID1 = 20, the product will change the value of register number 320.
•
Byte 2: value to assign to CONFID1 : in this example, its value has a size of 1 byte
•
Byte 3: CONFID2 (8bits) : indice of the second register to change. The corresponding register is 300 + value of CONFIDX.
EN
•
Bytes 4 and 5: value to assign to CONFID2 : in this example, its value has a size of 2 bytes
•
...
The product does not return any uplink frame following the reception of a downlink frame 0x41 et 0x43. However, the Config bit of the status
byte (see section 4.1.1.2) will be set to 1 in the next scheduled uplink frame (periodic or alarm or keep alive frame) if all was well done.
IMPORTANT: the value 0xFF for a CONFIDX will stop the reading of the downlink frame. Only the bytes preceding this value 0xFF will be taken
into account. This mechanism can be useful when you need to work in fixed downlink frame lengths and you do not want to use all available
bytes.
1
2
CONFID1 value CONFID2
3
4
PAYLOAD
CONFID2 value CONFID2 value ...
5
...
CONFIDn value
7
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