Paradise RA 5785 User Manual download pdf (Page 66)

66 208143 REV - Operations Manual, HPA3, Mini Compact Outdoor SSPA

8.1.5 Serial Communications Protocol

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

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 8-5: 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 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

Table 8-6: Response Frame Structure

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 81 82

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Paradise RA 5785 User Manual Page 66