Promag TR510E Manual page 18

This command is used to retrieve the database record with a specified
number. Record number must be supplied in Hex format, leading zeroes must
be preserved or error 04 will be returned. Record numbers start from 0000.
Specifying record number beyond N-1 (where N is the number of records in the
database returned by the N-command) will cause error 06.
When use this command to retrieve database, TR510E will automatically
lock itself, this means it will reject card reading until database stop retrieving,
then user's card can be read again; in the meantime, LED will display 'busy' as
following:
This auto-lock function prevent data is deleted inadvertently for some
application. Some application Polling database use command 'N' to get number
of records then use command 'G' to retrieve the records, at last use command
'E' to erase database. But during retrieve the records some user card's may be
read into database again, think of this, user's application does not know these
cards have read into database, application retrieves records but does not
include these new read-in records, when it erases database, these new read-in
records will be erased as well, this will cause lose data. Now the new auto-lock
function will prevent data was deleted inadvertently; when application stops
database retrieving, TR510E will wait 3 seconds for receiving command 'E', if
'E' command has received, TR510E erases database then unlock itself, user's
card can be read again; or until 3 seconds Time-out TR510E still has not
received 'E' command, however it will unlock itself but does not erase database.
Returned data string contains the record number, ID-code of the ID-card
that was used to create this record, event code (i.e. which button was pressed),
and the date and time of record creation.
The TR510E verifies all database records before sending them out to the
PC. This is done because the FLASH memory may actually contain a garbage
data. There is a special M-command that lets you initialize the database in such
a way that it appears to be 100% full (you can "recover" entire database
memory contents then). Naturally, some database records may turn out to
contain invalid data.
Database record validity is verified on a field-by-field basis. Should the field
TR510E User's Manual
18