Product

Technical Parameters

Technical parameter	Parameter value
Brand	SONBEST
Temperature measuring range	-30℃~85℃
Temperature measuring accuracy	±0.5℃ @25℃
Communication Interface	2 CAN
Default rate	250kbps
Power	DC9~24V 1A
Running temperature	-30~85℃
Working humidity	5%RH~90%RH

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Communication Protocol

  The product uses the CAN2.0B standard frame format. The standard frame information is 11 bytes, including two parts of information and the first 3 bytes of the data part are the information part. The default node number is 1 when the device leaves the factory, which means The text identification code is ID.10-ID.3 in the CAN standard frame, and the default rate is 50k. If other rates are required, they can be modified according to the communication protocol.
  The device can directly work with various CAN converters or USB acquisition modules. Users can also choose our industrial-grade USB-CAN converters (as shown in the figure above). The basic format and composition of the standard frame are as follows As shown in the table.

位	7	6	5	4	3	2	1	0
Byte 1	FF	FTR	X	X	DLC.3	DLC.2	DLC.1	DLC.0
Byte 2	ID.10	ID.9	ID.8	ID.7	ID.6	ID.5	ID.4	ID.3
Byte 3	ID.2	ID.1	ID.0	x	x	x	x	x
Byte 4	d1.7	d1.6	d1.5	d1.4	d1.3	d1.2	d1.1	d1.0
Byte 5	d2.7	d2.6	d2.5	d2.4	d2.3	d2.2	d2.1	d2.0
Byte 6	d3.7	d3.6	d3.5	d3.4	d3.3	d3.2	d3.1	d3.0
Byte 7	d4.7	d4.6	d4.5	d4.4	d4.3	d4.2	d4.1	d4.0
Byte 8	d5.7	d5.6	d5.5	d5.4	d5.3	d5.2	d5.1	d5.0
Byte 9	d6.7	d6.6	d6.5	d6.4	d6.3	d6.2	d6.1	d6.0
Byte 10	d7.7	d7.6	d7.5	d7.4	d7.3	d7.2	d7.1	d7.0
Byte 11	d8.7	d8.6	d8.5	d8.4	d8.3	d8.2	d8.1	d8.0

  Byte 1 is the frame information. The 7th bit (FF) indicates the frame format, in the extended frame, FF=1; the 6th bit (RTR) indicates the type of the frame, RTR=0 indicates the data frame , RTR=1 means the remote frame; DLC means the actual data length in the data frame. Bytes 2~3 are valid for 11 bits of the message identification code. Bytes 4~11 are the actual data of the data frame, invalid for the remote frame . For example, when the hardware address is 1, as shown in the figure below, the frame ID is 00 00 00 01, and the data can be responded by sending the correct command.
1. Query data
  Example: To query all 2 data of 1# device channel 1, the host computer sends the command: 01 03 00 00 00 02.

Frame type	CAN frame ID	mapping address	function code	starting address	data length
00 01	01	01	03	00 00	02

    Response frame: 01 03 04 07 3A 0F 7D.

Frame type	CAN frame ID	mapping address	function code	data length	data
Response frame	00 00	01	03	04	08 AD 0F 7D

  In the query response of the above example: 0x03 is the command number, 0x4 has 4 data, the first data is 08 AD converted into decimal system: 2221, because the module resolution is 0.01, this The value needs to be divided by 100, that is, the actual value is 22.21 degrees. Each data occupies two bytes, that is, an integer variable. The actual value needs to be divided by 100 on the basis of this value. Similarly, 0F 7D is the second data. Its value is 3965, that is, the true value is 39.65.
2. Change Frame ID
    You can use the master station to reset the node number by command. The node number ranges from 1 to 200. After resetting the node number, you must reset the system. Because the communication is in hexadecimal format, the data in the table Both are in hexadecimal format.
  For example, if the host ID is 00 00 and the sensor address is 00 01, the current node 1 is changed to the 2nd. The communication message for changing the device ID is as follows: 01 06 0B 00 00 02.

Frame type	Frame ID	Set Address	Function id	fixed value	target frame ID
Command	00 01	01	06	0B 00	00 02

  Return frame after correct setting: 01 06 01 02 61 88. The format is as shown in the table below.

Frame ID	Set Address	Function id	source frame ID	current frame ID	CRC16
00 00	01	06	01	02	61 88

  The command will not respond correctly. The following is the command and reply message to change the Set Address to 2.
3. Change target frame ID
    You can use the master station to reset the frame ID pointed by the sensor node through the command. The range of the node number is 1~200. After resetting the node number, because the communication is in hexadecimal format, the data in the table is in hexadecimal format.
  For example, if the host ID is 00 05 and the host address that the sensor originally points to is 00 01, the current number 1 will be changed to number 5. The changed communication message is as follows: 01 06 00 6D 00 05.

Frame type	CAN frame ID	device address	function code	fixed value	target frame ID
Command frame	00 01	01	06	00 6D	00 05

  Return frame after correct setting: 01 06 00 01 00 05. Format resolution is shown in the following table.

CAN frame ID	device address	function code	source target frame ID	target frame ID	check code
00 00	01	06	01	05	00 00

  If the command is incorrect, it will not respond. Here is the command and reply message to change the device address to 2.
3. Change device rate
    You can use the master station to reset the device rate through commands. The range of the rate number is 1~15. After resetting the node number, the rate will take effect immediately. Because the communication is in hexadecimal format, the rate in the table The numbers are in hexadecimal format.

Rate value	actual rate	rate value	actual rate
1	20kbps	2	25kbps
3	40kbps	4	50kbps
5	100kbps	6	125kbps
7	200kbps	8	250kbps
9	400kbps	A	500kbps
B	800kbps	C	1M
D	33.33kbps	E	66.66kbps

  The rate not in the above range is not currently supported. If you have special requirements, you can customize it. For example, the device rate is 250k, and the number is 08 according to the above table. To change the rate to 40k, the number of 40k is 03, the operation communication message is as follows: 01 06 00 67 00 03 78 14, as shown in the figure below.
  After the rate modification is performed, the rate will change immediately, and the device will not return any value. At this time, the CAN acquisition device also needs to switch the corresponding rate to communicate normally.
4. Return frame ID and rate after power-on
    After the device is powered on again, the device will return the corresponding device address and rate information. For example, after the device is powered on, the reported message is as follows: 01 25 01 05 D1 80.

Frame ID	device address	function code	current frame ID	current rate	CRC16
00 00	01	25	00 01	05	D1 80

  In the response frame, 01 indicates that the current frame ID is 00 01, and the speed rate value 05 indicates that the current rate is 50 kbps, which can be obtained by looking up the table.