that involves an user assigned identification tag, called
Recorder ID
. The user can assign any numeric value, from 1 to
127, as
Recorder ID
to the UniRec for its unique identification. The file created by UniRec for downloading the stored
records is named
recN.csv
; where
N
is the Recorder ID assigned to the UniRec. For example; the UniRec with Recorder
ID 5, creates and maintains the file with the name
rec5.csv
. The records are downloaded to the file on Pen Drive in
Comma Separated Values (CSV)
format and thus the file is assigned the extension '
.csv
'.
Upon selecting the ‘Copy (New)’ or ‘Re-copy (Old)’ operation (explained later) after insertion of the Pen Drive; the UniRec
first searches for any existing file with the name recN.csv (where, N is the Recorder ID assigned to the UniRec). If the file
exists, the UniRec appends the available stored records to the file. If the file does not exist, the UniRec automatically
creates a new file with the name recN.csv (where, N is the Recorder ID assigned to the UniRec) and then downloads the
records.
Back-up File System
It is possible that a file-write operation may be interrupted due to reasons like sudden power-failure or removal (or, loose-
contact) of the Pen Drive, resulting in partial transfer of records. An interrupted file-write operation makes the file unusable
for appending any further records. Also, the partially transferred records in the interrupted file are lost (but are still retained
inside the UniRec’s internal memory). That is, the file on Pen Drive exists with the previous records intact (if any) and
becomes a read-only file.
An interrupted file-write operation event is registered by the UniRec in its internal memory as well as on the Pen Drive that
was being written. Upon resumption of operation, the UniRec prompts for Recovery of the interrupted operation. Upon
selecting the “Recover” operation, the following sequence of steps is executed.
1. A back-up file of the existing interrupted file is created to retain the previous records.
The back-up file is named bN_S.csv; where, 'N' is the Recorder ID and 'S' is the sequential number (1 to 250) assigned
to the back-up file. For example; if the Recorder ID is 5 and there does not exist any previous back-up file, then the
new back-up file is named b5_1.csv. If, however, there exists previous back-up file(s), then 'S' is assigned the lowest
numeric value (in sequential order). For example; if a Pen Drive already contains back-up files – [b5_
1
.csv, b5_
4
,csv
and b5_14.csv] – then the new back-up file is named b5_2.csv.
2. The existing interrupted file is deleted.
3. A new file with the same name (e.g. rec5.csv) is created.
4. All the records (including those that were already transferred during the interrupted operation) are downloaded to the
new file.
PEN DRIVE (MEMORY-STICK) OPERATION
The UniRec is provided with a front panel USB port for file read and write operations using Pen Drive.
Pen Drive Checking
Upon inserting the Pen Drive into the USB port, the UniRec responds by displaying the following message on the LCD
screen:
Please Wait....
User Manual
UniRec
8
