EPSILON ES2,ES4
67
Appendix 11
Using frequency output mode
In FLS model ES2s output mode on the line TXD RS-232 signal with a frequency is implemented, that
corresponds uniquely to the measured level of fuel. Full frequency range is (500 ... 1500) Hz. Frequency
dependence of the level is linear, lower level corresponds to a lower frequency, and vice versa:
F = 500 + (DATA / SCALE) * 1000, where DATA - N-level code or the code of the capacitance C;
SCALE - the maximum use of the scale (1023 - for N = 10 bits, 4095 - for N = 12 bits, 65535 - for C ).
To set the frequency output in the program «ES Install» tab
and click
then turn off the power of FLS and the interface RS-232, connect the FLS to the frequency
input of tracker, according to the following scheme (see the attachment).
R3
10k
Q2
BC847C
Q1
BC817
R2
22
R1
10k
желтый
черный
синий
черный
Устро йство согласования у ровней
К выходу TxD ДУТ(желтый)
К пр оводнику Земля ДУТ (ч ерный)
Общий
Цифровой
+Uпит
(счетный) вход
ES.700
Внешний резистор подтяжки к напряжению питания.
Устанавливается в непосредственной близости к
устройству мониторинга только в том случае, если
цифровой вход подключаемого устройства не имеет
внутреннего подтягивающего резистора.
Рекомендованный номинал резистора 3...50кОм.
Устройство транспортного
мониторинга
Diagram of the matching device to match the frequency output from the frequency of FLS and input
device of vehicle monitoring (output - open collector, the maximum load current - 25 mA).
Turn on the power of FLS. Power supply U+t should not exceed the maximum permittable level of logic
"1" for the corresponding input in the device for vehicle monitoring.
Calibration of the fuel tank using the frequency output by using software program «ES Install» with the
further conversion of code-level into frequency in MS Excel using the formula: F = 500 + (N/1023) *
1000 for 10-bit data width or F = 500 + (N/4095) * 1000 for 12-bit data width (here F - frequency in Hz,
N - code level).
To ensure maximum accuracy of conversion of code-level into frequency it is recommended to set 12 bit
data width.
Also it is possible to perform the calibration procedure when frequency mode output is on, with the help
of standard diagnostic devices used to monitoring traffic.
