Operating instructions

LOCAL OPERATION
3-95
Write-protecting cards
The contents of memory cards can be protected from accidental overwriting or erasure by using
the differing methods of protection available on the Service Monitor and the memory cards.
Write protect card switch
Setting the write-protect switch, on the non-contact end of the memory card, offers a physical
method of protecting the card contents.
Protect store function
The use of the [Protect Store] key described under 'other memory functions' earlier, can be used to
protect any selected store location on the card. The protection information is contained on the
card and will remain active if the memory card is loaded in other service monitors or equipment.
Lock stores function
A coded lock function, accessible by using the [HELP/SETUP] [Card Setup] key sequence,
allows a portion of the store locations to be protected behind a four figure code. The use of this
function is described below.
Coded store protection
Memory cards can have code protected locking applied to a portion of the store locations. This
locking prevents the state of write-protection from being changed.
This allows users not in possession of the code, to have access to data held in protected stores,
without being able to remove the protection. Only users in possession of the code can unlock the
protection and change the contents.
The same code is needed to adjust the portion of memory locations locked.
After formatting, the code number of a card is 0 (single zero).
Locking Stores
The portion of store locations which can have their protection locked is variable from 1 to 90
locations.
Locking is carried out from the MEMORY CARD FORMAT screen. The right-hand soft keys of
this screen include [Change Code] and [Lock Stores] keys.
Any consecutive number of locations can be locked but must start at location 10.
To lock the protection on a portion of the store locations, proceed as follows:-
Store the settings or results into the required locations of the memory card as described
earlier.
Protect the store locations, using the [Protect Store] key and the relevant address.
Access the MEMORY CARD FORMAT screen, by the key sequence [HELP/SETUP],
[Card Setup].
The legend 'Locked' is shown against the [Change Code] and [Lock Stores] keys.
Press either of these keys and the inverse video message 'Enter Code' will be displayed.
Newly formatted cards have a code of 0 (single zero). Key this in and press the [ENTER]
key. The 'Locked' legend will no longer be displayed.
If the code is not '0', key in the correct four figure code and press the [ENTER] key.
When the 'Locked' legend is no longer displayed, press the [Lock Stores] key. The
inverse video legend Lock Stores 10 to is displayed.
Key in the address of the last store of the portion to be locked, using the data keys. The
address will appear on the display as it is keyed in. Press the [ENTER] key.
It will not be possible to change the state of protection of store locations in the locked portion of
the memory card. The unprotected store locations can be written to or deleted.