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88 205486 REV F Operations Manual, HPA2, Compact Outdoor SSPA
10.1.3 Source Address
The source address specifies the address of the node that is sending the packet. All unique
addresses, except the broadcast address, are equal and can be assigned to individual units.
The host computer must also have a unique network address.
10.2 Data Packet
The data sub-packet is comprised of 6 to 32 bytes of information. It is further divided into 7
fields as shown in Figure 10-3. The first 6 fields comprise the command preamble while the
last field is the actual data.
10.2.1 Protocol ID
This field provides backward compatibility with older generation equipment protocol. It should
normally be set to zero. This field allows the amplifier to auto-detect other firmware versions.
10.2.2 Request ID
This is an application specific field. The amplifier will echo this byte back in the response
frame without change. This byte serves as a request tracking feature.
10.2.3 Command
This one byte field tells the receiver how to use the attached data. There are only 4 possible
values for this field. The sender and receiver are limited to two commands. For example: if the
sender issued “Set Request” command, receiver must answer with “Set Response” command
in his response frame. The same technique applies to the “Get Request” and “Get Response”
form of the command. The byte value for each command is given in Table 10-1.
HEADER
(4 bytes)
DATA
(6-32 bytes)
TRAILER
(1 byte)
DATA FIELD
Protocol ID
1 Byte
Request ID
1 Byte
Command
1 Byte
Data Tag
1 Byte
Error Status /
Data Address
1 Byte
Data Length
1 Byte
Command
Data Sub
Structure
0 - 26 Bytes
COMMAND PREAMBLE
Figure 10-3: Data Sub-Packet
Command Name Command Byte Value
Set Request 0
Get Request 1
Set Response 2
Get Response 3
Table 10-1: Command Byte Values