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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Paradise RA 5785 manual Serial Communications Protocol, Request Frame Structure, Response Frame Structure

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