User's Manual

20
MESSAGE FORMATS
RADAR EVENT MESSAGES
Heart Beat message
This message is sent each time the heart period expires. The heart beat message period is controlled using the
*HBP command. The heart beat period is measured in frames.
Heart Beat message format
Notes to Heart Beat Message
The heartbeat period is set in seconds using the *HBP command. Setting the hearbeat period to 0 secs will turn
the hearbeat off. The maximum setting for the heartbeat period is 86400 secs.
A heartbeat message will always be produced after the radar initialises even if the heartbeat is turned off.
The host system should not send messages to the radar after power-up until this initial heartbeat message is
received.
Name Size / Bytes Value Notes
STX 1 2 Start of message byte
MT 2 ‘HB’ = Heart Beat Message type
, 1 ‘,’ Comma
Frame Number 8 XXXXXXXX Frame number in hexadecimal format
* 1 ‘*’ Asterisk
Check Sum 2 ‘XX’ Check sum in hexadecimal format
ETX 1 3 End of message byte
MT ,
S
T
X
*
E
T
X
Frame
Number
Check
Sum
2 11 1 18 2
Message Type
HB