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100 205486 REV F Operations Manual, HPA2, Compact Outdoor SSPA
Byte
Position
Bytes
Value
(hex)
Description
1 AA Frame Sync Byte 1
2 55 Frame Sync Byte 2
3 5 Destination Address of the unit
4 A Source address of Request originating PC Host
5 0 Protocol Version Compatibility Field must be always 0
6 6F Request ID is 111
7 1 “Get Request” designator
8 3 Data tag “3” – System Conditions
9 1 Data address 1 Beginning of the System Conditions table
10 12 18 Bytes – entire length of the system conditions table (2 bytes per value)
11 95 Arithmetic checksum of bytes 3 to 10
Table 10-14. Example 3 PC Request String
10.5.3 Example 3
Check SSPA Faults and Condition Status
● SSPA Network Address = 5
● Host Computer Network Address = 10
● Request ID = 0x6F
Table 10-15. SSPA Fault Status bit by bit description
Byte Value Bit Count Bit Value
Description
0 (Low Byte)
0 0 Summary Fault=0; Not Present
1 0 High Temperature Fault=0; Not Present
2 0 Low DC Current Fault=0; Not Present
3 0 Low DC Voltage Fault=0; Not Present
4 0 External Mute Status=0; Unmute
5 0 Internal Mute Status=0; Unmute
6 0 Reserved bit=0
7 0 Reserved bit=0
128
(High Byte)
0 0 BUC Fault=0; Not Present
1 0 Spare Fault=0; Not Present
2 0 Aux. Fault=0; Not Present
3 0 EEPROM Cal. Table Fault=0; Not Present
4 0 RF Switch 1 Fault=0; Not Present
5 0 RF Switch 2 Fault=0
6 1 On Line State=1; Unit Online
7 0 Reserved bit=0