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
Содержание 205486 REV F
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