Data collector format: packet structure
Applicable receivers: All receivers
Every command and report packet, regardless of its source and except for protocol sequences, has the same format as shown in the following table.
|
Byte # |
Message |
Description |
|---|---|---|
|
Begin packet header |
||
|
0 |
STX (02h) |
Start transmission |
|
1 |
STATUS |
Receiver status code |
|
2 |
PACKET TYPE |
Hexadecimal code assigned to the packet |
|
3 |
LENGTH |
Single byte # of data bytes, limits data to 255 bytes |
|
Begin packet data |
||
|
4 to length |
DATA BYTES |
Data bytes |
|
Begin packet trailer |
||
|
Length + 4 |
CHECKSUM |
Sum bytes (status + type + length + data bytes) and modulo 256 the summation |
|
Length + 5 |
ETX (03h) |
End transmission |