Seca 780 - SeSAM bus; Identification code; Backlighting (optional); Signal transmitter (optional)

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 thatthe 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 oronly 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.
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.
Recalibration
In order to compensate for linear measuring errors of the scale, which can, for instance, occur as a
result of the different forces of gravity at different geographical points, the module has a recalibration
30-34-00-618 2 06.09.1999
EE/Jensen