Transmission Of A Daily Keep Alive Frame; Transmission Of The Response Frame Following A «Reading Register Slave» Request; Transmission Of The Acknowledgment Following A "Write In A Slave Register" Request - ADEUNIS sigfox MODBUS MASTER Guide Utilisateur

sigfox MODBUS MASTER - Guide utilisateur / User guide version V2.0.0

2.1.8 Transmission of a daily Keep Alive frame

If the product has no periodic data configured, a Keep Alive frame (0x30) is transmitted regu-
larly according to the diagram.
The settings associated with this mode of operation are:
• The setting of the period of transmission of the Keep Alive frame (register 300).
E.g.:
Register Encoding
S300 Decimal
2.1.9 Transmission of the response frame following a «reading register slave» request
This frame is sent in response to a downlink request to read registers in a Modbus slave (0x05).
Reception of
a 0x05 frame
Reading of the
concerned register in
the slave
Send frame 0X5E
2.1.10

Transmission of the acknowledgment following a "write in a slave register" request

This frame is sent following the reception of a downlink frame (0x08) to write into the register of a Modbus slave. This frame contains the infor-
mation about the status of the request (success, modbus error, invalid request error).
Reception of a
0x08 frame
Writing into the
concerned register of
the slave
Envoi trame 0X2F
VALUE Result
8640 The Keep Alive frame is sent every:
8640 x10s= 24h (once per day)
If the request is false or there is an error during reading, this frame will be empty.
Product in standby
No
Period
reached?
Yes
Send frame 0X30
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