Specifications

Alarm output

The output is 12V DC at 0.5A and may drive a variety of DC

sounders/indicators or a relay for more powerful devices. The Alarm output

is identical to the lock output and so the same considerations of voltage-

drop apply.

Time-clock

The terminal pair marked ‘TIME’ on the 108 PLUS PCB can be connected

to an external switch to enable the second access code (factory setting).

This switch may be a simple keyswitch, operated manually, or more usually

a Time-Clock. The switch contact must be fully isolated (i.e. voltage-free).

Direct Trigger Input

The terminal marked ‘TRIG’ may be connected to an external push-button

for egress operation. Momentarily operating this button will directly operate

the lock release for the programmed duration.

Alternatively the input may be used with a Firemans Override keyswitch,

which should be of the normally-open type. If this feature is to be used it

is important that the lock release be of a continuously rated design.

In general, a switch connected to the ‘TRIG’ terminals should be fully

isolated i.e. voltage-free.

Choosing an access code

To ensure an adequate level of security it is recommended that a minimum

of 4 digits be used for each access code, giving 10,000 combinations.

Longer codes (Upto 8 digits) provide higher levels of security but are more

difficult to remember. Codes should be chosen carefully to avoid obvious

sequences and repetitions (eg 12345, 258, 4444) which may be easily

guessed or discovered. Try to choose codes with a random appearance

(eg 6149, 186403) and avoid telephone numbers and other meaningful

codes which, again, may be guessed by a would-be intruder. It is also a

good idea to regularly change the access codes.

Maintenance

It is important also that the keypad be regularly cleaned to remove finger

marks which would otherwise give clues as to the keys used in the access

code.