Controller Area Network

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A Controller Area Network (CAN ) is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other's applications without a host computer. It is a message-based protocol, designed originally for multiplex electrical wiring within automobiles to save on copper, but it can also be used in many other contexts. For each device, the data in a frame is transmitted serially but in such a way that if more than one device transmits at the same time, the highest priority device can continue while the others back off. Frames are received by all devices, including by the transmitting device.

Field #	Name	Value	Description	# Bytes
1	$CAN		Starting Character of String	3
2	Vendor ID	RDME	Unique vendor specific Id	4
3	Packet status	‘L’ or ‘H’	Live (L) data or History (H) Data	1
4	IMEI Number		Unique code for unit identification	15
5	Current Date	ddmmyyyy	From GPS RMC packet	8
6	Current Time	hhmmss	GMT Time	6
7	Ignition Status	0 or 1		1
8	Calculated engine load	0 to 100	Unit %	3
9	Engine coolant temperature	-40 to 215	Unit °C	3
10	Engine RPM	0 to 16384	Unit rpm	5
11	Vehicle speed	0 to 255	Unit km/h	3
12	Vehicle Odometer	0 to 429496729	Unit km	9
13	Intake manifold absolute pressure	0 to 255	Unit kPa	3
14	MAF air flow rate	0 to 655	Unit g/s	3
15	Distance traveled with malfunction indicator lamp (MIL) on	0 to 65535	Unit km	5
16	Warm-ups since codes cleared	0 to 255	Unit count	3
17	Distance traveled since codes cleared	0 to 65535	Unit km	5
18	Run time since engine start	0 to 65535	Unit s	5
19	Throttle position	0 to 100	Unit %	3
20	Fuel Input Leve	0 to 100	Unit %	3
21	Engine oil temperature	-40 to 210	Unit °C	3
22			0 - Not available
			1 - Gasoline
			2 - Methanol
			3 - Ethanol
			4 - Diese
			5 - LPG
			6 - CNG
			7 - Propane
			8 - Electric
			19 - Hybrid Diesel
			20 - Hybrid Electric
			21 - Hybrid running electric and
	Fuel Type	0 to 23	combustion engine
23	CNG Level			5
24	End of Message	‘*’	Denotes end of message	1
24	Delimiter	,	All fields are delimited by a comma	22
			Max Bytes Per Message	124

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Controller Area Network

AIS 140 Approved Vehicle Tracking Device