User's Manual

17
MESSAGE FORMATS
RADAR EVENT MESSAGES
Event Start message
This message is sent after the radar has established that a vehicle has entered the radar’s beam.
The numbers above the boxes in the diagram below indicate how many bytes are used for each field.
Event Start message format
Name Size / Bytes Value Notes
STX 1 2 Start of message byte
MT 2 ‘ES’ = Event Start Message type
, 1 ‘,’ Comma
Frame Number 8 XXXXXXXX Frame number in hexadecimal format
, 1 ‘,’ Comma
Target Number 8 XXXXXXXX Target identification number in
hexadecimal format
, 1 ‘,’ Comma
Direction 1 ‘A’ = Approaching Target
‘R’ = Receding Target
‘X’ = Simulated approaching target
‘Y’ = Simulated receding target
Direction the target is travelling.
, 1 ‘,’ Comma
Speed 5 ‘DDD.D’ Target speed to one decimal place in
decimal format
, 1 ‘,’
Speed Units 1 ‘M’=MPH
‘K’=km/hr
The speed units used for the
measurement
, 1 ‘,’ Comma
Target Range 5 ‘DDD.D’ Target range in metres
* 1 ‘*’ Asterisk
Check Sum 2 ‘XX’ Check sum in hexadecimal format
ETX 1 3 End of message byte
MT ,
S
T
X
, , ,D U, , *
E
T
X
Frame
Number
Target
Number
Speed
Speed Units
Direction
A, R, X or Y
Message Type
ES
Target Range Check Sum
2 11 1 1 11 11 1 1 18 8 5 5 2