Page 12 Document Ref 903158-001
MA26 MP-T1 Meter for Fuel Dispensers Component Technical Manual
Output driver
The output driver is necessary to supply the current needed for the inputs of the
calculator. Furthermore it delays the low to high transition of the cl pulses on
the output lines A and B. This delay is to prevent cross talk between the two
pulse lines and interference on other lines.
Comparator
This block checks the input and output of the output driver during the 400µs
pulse. If the output line is high (idle state) while the input of the driver is activated,
it will send a “not equal” signal to the error block.
The inputs of the comparator used for monitoring lines A and B are provided
with a digital filter. This filter will remove glitches (smaller than 32µs) from
these two signals.
Error
The signals “overflow”, “sensor defect” and “not equal” are collected here.
When one or more signals are active, the error signal will be activated. This
signal can only be deactivated by switching off the MP T1 power. When the
error signal is activated, the output driver is disabled, so the output lines become
low (error indication of the MP-T1).
Issue A
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