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Entry-Master Option-4 Hardware Installation Guide
H. Option-4 Circuit Board Restrictions
Here are the recommendations for installing the Option-4 board:
1. Use a separate power supply for locks and sirens (i.e. one power
supply for the Option-4 board and a different supply for the
peripheral devices).
2. DC inductive loads (magnetic locks, lock strikes, relays, etc.) need
to have a reversed-biased diode (1N4001 recommended) installed
as close as possible to the lock or relay coil.
3. Use a 12VAC 20VA transformer to power a single Option-4 board;
a 12VAC 40VA can power up to two (2) Option-4 boards.
4. If an Option-4 board is not powered through a UPS, a battery
backup is recommended.
5. Wiring from the iButton readers to the Option-4 board should be
done with non-shielded cable. Shielded cable will significantly
reduce the length of cable allowed between the iButton reader and
the Option-4 controller board.
6. Use recommended wiring diagram(s) as appropriate (refer to the
drawings on Pages 9 and 10).
7. The Option-4 board should be well grounded. At least one of the
ground leads should be connected to an earth ground.
8. Batteries used for battery backup must be 12V gel-cell lead-acid
types. If the board is powered by DC and you wish to use battery
backup, DC voltage must be at least 14V. If it’s powered by 12-24V
AC the board will trickle charge the battery.
9. The transistor outputs can be used for controlling DC locks directly
if the activation current is less than 1A. The current can be up to
2A if a heat sink is mounted on the output transistor. Transistor
outputs can be used to power a relay to control AC or high power
locks, sirens, etc.
10. The internally generated power must be used to power the locks if
the board is to operate locks in battery backup mode.
11. All pins labeled GND or G are connected together. This is important
to know to avoid possible damage to the Option-4 board.
