30-34-00-618a 25.07.06
QS / Eggers
2
Power supply
Power supply is provided via the SeSAM bus.
Operation
With the exception of a start button that might be available, the connected buttons can be configured
as required for the particular model. These buttons can be pressed just lightly or longer (longer than
1.5s).
If you press another button when switching on the scale, the scale will switch to the verification counter
and recalibration mode.
SeSAM bus
The SeSAM bus connects the display modules to the other modules. On this bus the stabilized and
non-stablized supply voltages are available. Via a data and a clock pulse line all relevant data is
exchanged. A special start line is provided via which the scale can be switched on or the module can
signal that it wants to send data.
Identification code
If several display modules are connected, an unmistakable ID code must be assigned to them using
soldering jumpers to ensure that the different modules are correctly addressed via the bus.
Backlighting (optional)
Some display modules are equipped with a power supply for LCD backlighting. It can either be lit when
the scale is switched on or only when the scale is loaded.
Signal transmitter (optional)
Some display modules are equipped with a signal transmitter. A piezo diaphragm is used which is
controlled with a 4 kHz square-wave signal.
Clock module RTC (optional)
Display modules may be equipped with a clock function. If the circuit board is fitted with the relevant
RTC components, when switching on the scale the time is indicated in the display for about 2 seconds.
The power supply of the module results from the supply voltage of the scale. Voltage interruptions are
compensated for a short time
Fault handling
If faults occur, the SeSAM bus initiates a fault message with the relevant fault code. Furthermore, each
fault message includes the number of the module type on which the fault has occurred and a code
which indicates how long the message is to stay on display and which displays are to be suppressed.
The display module displays its own fault messges on its LCD. Module type (for the display module =
3) and fault number are output. In addition, the fault messages that other modules have transferred to
the SeSAM bus are displayed.
The following fault messages are implemented:
14
Fault in the kg value calculation
15
Recalibration fault
30
General bus fault
32
Command buffer full
33
More than 8 slaves detected
50
Other fault
51
Menu fault
Time base
From the quartz’s 4.19MHz a time base is derived which controls all timed processes in the scale.
These are, for instance, various timeouts.
To Next Page
Loading...
