Standard and extended buffers can be intermixed, but only extended buffers
can log data past the 64K memory limit.
8.5.1
Buffer Format Convention
Information is stored in the data buffers as a sequence of one or more data
bytes. Each sequence is called a ‘log entry’. There may be many log entries in
each buffer.
There are two log entry types:
•
Fixed TIME and SIZE.
•
Variable TIME and fixed SIZE.
n
Fixed TIME and SIZE
This is the most common form of log entry. Each entry is a fixed number of
bytes long and is stored at a fixed interval. For example, recording the wind
speed and ambient temperature every hour would produce fixed TIME and
SIZE log entries.
PROLOGGER Hardware
PROGRAMMING THE PROLOGGER 45
256
260
264
268
272
Current Buffer Pointer
Buffer Status Flags
Reserved
End Buffer Pointer
Start Buffer Pointer
Current Buffer Pointer
Buffer Status Flags
End Buffer Pointer
Start Buffer Pointer
Small
Extended
(up to 64K)
Buffer 0
Buffer 1
7
6
5
4
3
2
1
0
XT
OV NC
Extended Addressing
BCT (32 bit pointers)
OV=1
Buffer has overflowed
NC=1
Non-Circular Data Buffer
XT=1
(32 bit)
(16 bit)
(16 bit)
(16 bit)
Buffer overflow counter
(24 bit)
LM MC EV OF
OF=1
Buffer overflow
EV=1
Counter active (event
based logging)
LM=1
Log to memory card
MC=1
Memory card active
R
R
Reserved
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