124 208495 REV B Operations Manual, HPA2, Compact Outdoor SSPA
To change the attenuation of the connected amplifier, the Host PC sends the following
Request String: (refer to Table 11-5)
The Compact Outdoor SSPA responds with the following Response String:
Byte Position Byte Value (Hex) Description
1 AA Frame Sync Byte 1
2 55 Frame Sync Byte 2
3 5 Destination Address of Compact Outdoor SSPA
4 A Source Address of PC sending Request String
5 0 Protocol Version Compatibility Field must always be 0
6 6F Request ID byte is set by originator, will be echoed back by respondent
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 through 11
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 SSPA sending Response String
5 0 Protocol Version Compatibility Field must always be 0
6 6F Echo of the originator Request ID byte
7 2 Command “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
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