Any device that receives a GroupValueRead telegram from the bus will look up the Group Address (= the Destination Address) via the Address Table.
If the Group Address is in the Address Table and the telegram is received error-free, then:
- The device will send a positive Link Layer acknowledgement
- The effected Group Object or Objects will be looked up via the Association Table
If the 'C' and the 'R' of the effected Group Object or Objects are set, then per such Group Object
- A GroupValueResponse telegram will be sent
- The sending Group Address of the Group Object will be put in the Destination Address field of the GroupValueResponse telegram
- The value of the Group Object will be fetched and put in the payload field of the GroupValueResponse telegram
If the Group Address is in the Address Table, but the telegram contains at least one error, then:
- The device will send a Link Layer negative acknowledgement
If the Group Address is not in the address table, then:
- The device will not react