Paradise RA 5785 manual Serial Communications Protocol, 5 Request Frame Structure, Byte position

8.1.5 Serial Communications Protocol

Tables 8-5through 8-9describe the various values of the serial communications protocol.

Table 8-5: Request Frame Structure

Byte position	Byte Value (Hex)	Description
1	0xAA	Frame Sync 1
2	0x55	Frame Sync 2
3	Destination Address	-//-
4	Source Address	-//-
5	Protocol Version	Protocol compatibility hole, must be set to 0
6	Request ID	Service Byte
7	Command	0, Set Request; 1, Get Request
8	Data Tag	0, System Settings; 1, System Thresholds; 2, Temp. Sensor
		Settings; 3, Conditions; 4, ADC Data; 5, Raw NVRAM/RAM Data
9	Data Address	Setting number, Sensor command, EEPROM address
10	Data Length	Total length of the data, valid values 1-30
11+N	Data	Actual Data
11+N+1	Checksum	Dest. Address + Source Address + Protocol Version + Request ID
		+ Command + Data Tag + Data Address + Data Length + Data

Table 8-6: Response Frame Structure

Byte position	Byte Value (Hex)	Description
1	0xAA	Frame Sync 1
2	0x55	Frame Sync 2
3	Destination Address	-//-
4	Source Address	-//-
5	Protocol Version	Protocol compatibility hole, must be set to 0
6	Request ID	Service Byte
7	Command	2, Set Response; 3, Get Response
8	Data Tag	0, System Settings; 1, System Thresholds; 2, Temp. Sensor
		Settings; 3, Conditions; 4, ADC Data; 5, Raw NVRAM/RAM Data
9	Error Status	0, No Errors; 1, Too Big; 2, No Such Data; 3, Bad Value; 4, Read
		Only; 5, Bad Checksum; 6, Unrecognized Error
10	Data Length	Total length of the data, valid values 1-30
11+N	Data	Actual Data
11+N+1	Checksum	Dest. Address + Source Address + Protocol Version + Request ID
		+ Command + Data Tag + Data Address + Data Length + Data

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