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
