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98 205486 REV F Operations Manual, HPA2, Compact Outdoor SSPA
10.5.2 Example 2
Change SSPA Attenuation to 20 dB (55dB gain)
● SSPA Network Address = 5
● Host Computer Network Address = 10
● Request ID = 0x6F
Table 10-12: Example 2 PC Request String
Byte
Position
Byte
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 0 Command “Set request” designator
8 0 Data tag “0” indicates access to SSPA Settings
9 5 Data address 5 indicates access to SSPA attenuation
10 1 Data length is 1 byte
11 C8 Data 200 - 20.0 dB x 10 attenuation
12 4C Arithmetic checksum of bytes 3 to 11
Table 10-13. Example 2 SSPA Response String
Byte
Position
Byte
Value
(hex)
Description
1 AA Frame Sync Byte 1
2 55 Frame Sync Byte 2
3 A Destination Address of PC request originator
4 5 Source address of the respondent
5 0 Protocol Version Compatibility Field must be always 0
6 6F Echo of the Originator’s Request ID byte
7 2 “Set Response” designator
8 0 Data Tag “0” was accessed
9 0 Data address omitted and replaced with error status “0” – no errors.
10 1 Data length is 1 byte
11 C8 Data 200 - 20.0 dB x 10 attenuation successfully set
12 49 Arithmetic checksum of bytes 3 to 11