
37
Packet Structure:
packet-type
sub-header
data
Sub-header 0, two options:
standard:
,id,start-byte,total-bytes:
with station name:
,id,start-byte,total-bytes,station-name:
Sub-header 1 thru N:
,id,start-byte:
where,
packet
-type
:=
Numeric ASCII character defining packet type. See type definitions in table,
below
id
:=
Numeric ASCII text defining the message id. Starts at 0. Rolls over after 99.
total-
bytes
:=
Numeric ASCII text defining the total number of data bytes to be sent (data
only, does not include overhead bytes)
start-
byte
:=
Numeric ASCII text defining which byte of total-bytes is the start byte of the
current packet. Starts at 0.
station
-name
:=
Optional ASCII field that has station name. Formatted as ,N=STATION
NAME
Packet Types
Hex Value
ASCII
Description
0x30
0
Self-timed
0x31
1
Self-timed extended
0x32
2
Entering alarm