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RCP2-1000 RM Remote Controller Operations Manual 203987 Rev A 35
5.1.2 Data Packet
The data sub-packet is comprised of 6 to 32 bytes of information. It is further divided
into seven (7) fields as shown in Figure 5-3. The first six (6) fields comprise the com-
mand preamble while the last field is the actual data.
5.1.2.1 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 firm-
ware versions.
5.1.2.2 Request ID
This is an application specific field. The amplifier will echo this byte back in the re-
sponse frame without change. This byte serves as a request tracking feature.
5.1.2.3 Command
This one byte field tells the receiver how to use the attached data. There are only four
(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
“Get Request” and “Get Response” form of the command. The byte value for each
command is given in Table 5-1.
HEADER TRAILER
DATA
(4 Bytes) (6 - 32 Bytes)
(1 Byte)
Protocol ID
1 Byte
Request ID
1 Byte
Command Data Tag
Error Status /
Data Length
1 Byte
1 Byte
1 Byte
1 Byte
Command Data Sub Structure
0 - 26 Bytes
DATA FIELDCOMMAND PREAMBLE
Data Address
Command Name
Command Byte Value
Set Request 0
Get Request 1
Set Response 2
Get Response 3
Table 5-1: Command Byte Values
Figure 5-3: Data Packet