Promag TR515 User Manual page 17

Initialize the database ('E', 45H)
Command E
Reply A
Executing this commands initializes the database. This command can be
used to delete all database data and restore the database functionality in case
of database malfunction.
E-command doesn't really delete the data itself- just some internal database
housekeeping is initialized. The data can still be (partially) recovered using an
M-command.
Prepare for database recovery ('M', 4DH)
Command M
Reply A
This command alters the database in such a way that it appears to be 100%
full. The M-command, therefore, can be used for data recovery purposes. For
example, if E-command is executed accidentally while TR515 had some useful
data inside, then M-command can be used to download entire database
memory contents. Naturally, this recovered data may not be consistent. Some
records may contain "garbage" data (more on this in G-command description),
newer records may overlap older ones, etc.
Perform self-test ('Z', 5AH)
Command Z
Reply This command is never replied to
This command is used to force the TR515 into a special Test mode. No
reply is issued by the TR515 upon receiving this command. Details of TR515's
TR515 User's Manual
15
Possible error codes: none
Possible error codes: none
Possible error codes: none