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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