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Operations Manual, HPA3, Mini Compact Outdoor SSPA
9.1.5 Serial Communications Protocol
Tables 9-5
through
9-9
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. A Source A Protocol V Request ID
+ C Data Tag + Data A Data Data
Table 9-5: 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. A Source A Protocol V Request ID
+ C Data Tag + Data A Data Data
Table 9-6: Response Frame Structure
