122 208495 REV B Operations Manual, HPA2, Compact Outdoor SSPA
11.1.6 Serial Communication Examples
The following shows an example of a communication exchange between a PC and Compact
Outdoor Amplifier, assuming the following:
• SSPA Network Address = 5
• Host Computer Network Address = 10
• Request ID = 0x6F
The Host PC Request String is: (refer to Table 11-5)
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 1 Command field for “Get” type request
8 0 “SSPA Settings” tag indicates which data from respondent is required in
response frame
9 1 Data Address field indicates the beginning data address inside of the
“SSPA Settings” data set to 1 (first element)
10 A Data Length field indicates how many data bytes of the “SSPA Settings”
requested from the amplifier
11 8A Arithmetic checksum of bytes number 3 through 10
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