23
Device processes data in 3 different ways, one of which is fl ash memory write.
Device has 2 MB of fl ash memory for data recording. Data can be saved in fl ash memory in 3 differ-
ent formats: processed, unprocessed and interval logged.
Interval logging is described in “Channel Interval” sub chapter.
Table how data is saved to fl ash memory depending on devices and settings.
Channels
Other periodic
Sporadic
Unknown
MTR260
Processed
Processed
MTR262/FTR262
Processed
Unprocessed
MTR264
Processed
Unprocessed
MTR265
Processed
Unprocessed
MTR165
Processed
Processed
FTR860
Processed
Processed
CSR260
Processed
Processed
CSR264
Unprocessed
KMR260
Unprocessed
X
Unprocessed
Note! Cells in gray are not possible options.
Memory usage
Data type
Bytes per entry
Max entry count
Processed data
13 bytes
150000 entries
Unprocessed data
10..17 bytes (on average 16)
125000 entries
Interval logged data
(7+N*6)/N bytes, in which N means logged
channel count
320000 entries
Memory is organized as a ring buffer. When memory starts to fi ll up then the oldest entries will be
overwritten in 64kB sectors, which means that 64kB of oldest data is cleared and then fi lled with
data, and when it fi lls up then another 64kB of oldest data is cleared and so on.
Memory fi ll rate can be calculated as follows. Let’s assume there are 30 transmitters whose trans-
missions are logged once in a minute. Memory fi ll rate would then be approximately 150000/(30/60s)
= 300000s = 83h. So memory would need to be read in under 83h so that no data is lost.
On the other hand, memory can last longer if data is interval logged say once in a 5 minute. In this
case data uses (7+30*6)/30 = 6.23 bytes per entry and memory fi ll rate would be approximately
(2000000/6.23)/(30/(5*60s)) = 3210000s = 891h = 37 days.
FLASH
