15.2 KERN alibi memory
For weighings where verification is mandatory and which are to be analysed and pro-
cessed by a PC (e.g. printing out a packing list using a PC instead of a printer con-
nected directly to the balance) electronic archiving is required by the metrological au-
thorities by a verifiable data memory which cannot be manipulated. These stored
data strings can be retrieved & displayed at any time via a connected PC
- The Alibi memory offers the possibility to store up to 250.000 weighing results,
when the memory is exhausted, already used IDs are overwritten (starting with
the first ID).
- By pressing the Print key or by KCP remote control command "S" or
"MEMPRT" the storage process can be performed.
- The weight value (N, G, T), date and time and a unique alibi ID are stored.
- When using a print option, the unique alibi ID is also printed for identification
purposes as well.
- The stored data can be retrieved via the KCP command "MEMQID". This can
be used to query a specific single ID or a series of IDs.
- Example:
o MEMQID 15 → The data record which is stored under ID 15 is returned.
o MEMQID 15 20 → All data sets, which are stored from ID 15 to ID 20,
are returned.
The detailed description can be found in the KERN Communication Protocol manual,
available in the Downloads tab on the home page of KERN (www.kern-sohn.com).
- Protection of stored legally relevant data:
o After a record is stored, it will be read back immediately and be
verified byte by byte. If error is found that record will be marked
as an invalid record. If no error, then the record can be printed
if needed.
o There is checksum protection stored in every record.
o All information on a printout is read from the memory with
checksum verification, instead of direct from buffer.
- Data loss prevention measures:
o The memory is write-disabled upon power-up.
o A write enable procedure is performed before writing a record
to the memory.
o After a record is stored, a write disable procedure will be per-
formed immediately (before verification).
o The memory has a data retention period longer than 20 years.
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