Capacity Fuel Sensor Agreement Structure Control Fuel By Remote For GPS Tracker

characteristic:

capacity fuel sensor This series of sensor is measuring level measuring instrument, has the very high resolution and accuracy of measurement. It without human intervention, automatic calibration, does not exist temperature drift, and could not be affected by changes in the media. That is with a sensor, no matter be measured medium is water or gasoline or diesel, no matter how the temperature changes, it can correct output level highly accurate signal. Thoroughly solved the ethanol and gasoline, methanol fuel, and other media difficult the problem of measurement, and it solves the different areas for oil different and temperature of the label huge differences of the measurement error problem. At present the technology in China is unique, in international leading level.

Three, communication protocol

1, capacity fuel sensor agreement structure

Terminal to send to oil level gauge order by the five parts, as follows:

Baotou: 2 bytes, fixed for ASCII $!!!!! (0 x24 0 x21)

Command: 2 bytes, each are not identical, as DO (0 x44 0 x4F)

ID: 2 bytes, the serial number of the ASCII said, such as 01 (0 x30 0 x31). For a maximum of 99

Collation: 2 bytes, take a check and way, for baotou to ID from the sum of all characters and low 8 bits, finally, the low 8 bits into ASCII said hexadecimal way, such as finally calculate out of collation and 0 x0245, is to keep only low 8 bits, namely 0 x45, turns into ASCII said hexadecimal for "45" (0 x34 0 x35)

Packet tail: 2 bytes, for carriage returns operator, namely 0 0 x0A x0D

capacity fuel sensor Oil level meter to send to the orders of the terminal also by the six parts, as follows:

Baotou: 1 byte, fixed for "*" date, namely 0 x2A.

Mark: three bytes, shows that the current reply of the data type.

ID: 2 bytes, the serial number of the ASCII said, such as 01 (0 x30 0 x31). For a maximum of 99

Value: six byte, shows that the current value of the reply, fixed length for six byte

Collation: 2 bytes, take a check and way, from baotou to value for the sum of all characters and low 8 bits, finally, the low 8 bits into ASCII said hexadecimal way, such as finally calculate out of collation and 0 x0245, is to keep only low 8 bits, namely 0 x45, turns into ASCII said hexadecimal for "45" (0 x34 0 x35)

Packet tail: 2 bytes, enter line breaks, namely 0 0 x0A x0D

2. agreement:

1. Read (1) level:

By a terminal or computer to send to level meter command (no filter) :

ASCII : $!DO0139

An 01 result indicates the ID number

Among them and said collation and, from $characters (namely 0 x24) began to collation and before the sum of all characters directly the low 8 bits, the eight into hexadecimal ASCII, such as $!!!!! 0 x0139 after DO01 addition, the collation of 39 for ASCII value, namely 0 x33 0 x39)

Hex: 24 21 44 4 F 30 31 33 39 0 D 0 A

The liquid level meter response:

ASCII : *RFV01000.0197

RFV as for reading level to return to sign.

For the current oil level sensor 01 ID number.

000.01 to the current oil a value, percentage said, high for 100.00. Fixed to XXX. XX form expression, less than a to zero added. Such as 012.21, 12.21% said.

98 for collation and

Hex: 2 A 52 46 56 30 31 30 30 30 2 E 30 31 39 38 0 D 0 A