Service Manual Description of the LC2 electronics
23.07.07 Kr/Rei Page 3(6) 30-34-00-745
Type of memory Size
Flash memory 8 Kbytes
EEPROM 512 bytes
The flash memory holds the firmware for the microcontroller. During programming, the data is written
to the flash memory via the 10-pin programming interface. The parameters read out by the LC display
module from the LC weight module after being set into operation for the very first time are stored in the
EEPROM. Both memories are protected by an LRC checksum. A data error in either of the two
memories cannot be remedied during the operation and causes a permanent fault indication.
Weighing operations are then no longer possible. Once the scale has been programmed, both
memories are protected against reading out and modifying data via the programming interface. Any
modification of the data first requires that both memories are completely cleared.
Fault handling
If faults occur, they are displayed on the LCD with the relevant fault code. Each fault message
includes the number of the module type on which the fault has occurred.
Module Number
LC weight module 10
LC display module 11
The following fault messages are implemented:
Fault number Fault description
11 Outside value range (positive or negative overload)
12 Switch-on zero point outside the permissible range
13 Zero follow-up outside the permissible range
16 No zero point
40 EEPROM checksum fault
50 Flash memory checksum fault
60 Bus communication fault
Technical data
Supply voltage : 9V – 12V (via LC module bus)
Supply current: typ. 11.8mA
Zero-signal current: typ. < 0.1µA
Operating temperature: approx. 0°C to 50°C
Storage temperature: -10°C to 60°C
Dimensions: 63mm x 42mm x 1.7mm
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