Capacitive Fuel Sensor Monitor Liquid Lever 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
