Specifications
Section 6: Commands
6-13
12. REVERSE LOCK (Y/N): N?
17. This field makes possible the use of either a fail-safe (unlocks on loss of power) or fail-secure
(locks on loss of power) door locks in a system. A fail-safe lock will unlock when lock contacts
are opened by the Alto 818 or when power to the ACU is lost. Operation of a fail-secure lock
is opposite: The door will be locked when power to the ACU is lost or when the ACU lock
contacts are open. Type Y or N as required and press Enter. The screen displays:
13. UNLOCK TIME (1-240): 10?
18. In field 13, the length of time a door will remain unlocked after a valid access is granted is
designated. Enter a time, from 1 to 240 seconds, the default is 10, and press Enter. The
screen displays.
14. DOOR OPEN TOO LONG TIME (1-240): 10?
19. This field is used to select a time period between 1 and 240 seconds during which the door
may be held open before a DOOR OPEN TOO LONG log event is recorded. (The door open
must be valid.) The default setting for this field is 10 seconds. Type the number of seconds
desired and press Enter. The screen displays:
15. DOOR SWITCH (X.Y): ?
20. A door switch indicates that a door is open. The switch is interfaced to the ACU through a
contact pair on an MSM. The monitor point address for a contact pair is defined as X.Y,
where:
X = MSM number (sensor port 18 to which it is connected)
Y = Number of the MSM contact pair (1-4)
No door switch is represented by 0.0. Enter the desired switch number and press Enter. The
screen displays:
16. REX SWITCH (X.Y): ?
NOTE:
If both a REX switch and a door switch are assigned to a door, the REX switch should be
connected to a lower number contact pair than the door switch, i.e., REX switch 3.1 and door
switch 3.2.
21. A request-to-exit (REX) switch may be interfaced to the ACU through a contact pair on an
MSM. See the above discussion for the door switch. Enter the desired switch number and
press Enter. For non 0.0 entries, the additional REX configuration screens are displayed:
16A. UNLOCK ON REX (Y/N): N?