Specifications

Alto 818 Installation and Operation
5-8 P/N 66109074001 Rev. D
5.3.3 LOCK RELAY TEST
This test will verify the operation of the Alto 818 lock relays. Valid abbreviations for commands
used are shown in parentheses.
1. Type UNLOCK (UNL) and press Enter. The screen displays:
DOOR 1-8 OR 0 FOR ALL)?
2. Type 0 and press Enter. Listen for the click of relays and observe that all green relay LEDs
illuminate in sequence on the ACU.
3. Set the DMM, or ohmmeter, on the 10-ohm scale. Measure the resistance between each
lock terminal (lock 1 through lock 8) and its associated common terminal. The meter should
read 0 ohms resistance. If the meter reading indicates any resistance or an open circuit
(infinite resistance) for any lock terminal, that lock relay is not functioning properly and unit
should be returned to the factory.
LOCK 5
COMMON 3, 4
LOCK 4
LOCK 3
COMMON 1,2
LOCK 2
LOCK 1
RELAYS
DMM or
Ohmmeter
Figure 5-4: Measuring Lock Relay Resistance
4. At the command prompt, type RELOCK (REL) and press Enter; the screen displays:
DOOR (1-8 OR 0 FOR ALL)?
5. Type 0 and press Enter; listen for the click of relays and observe that all green RELAY LEDs
go out in sequence.
6. Repeat resistance measurements in step 3, above; all relay contacts should indicate an open
line or infinite resistance. If the meter reading indicates zero or any resistance on the 10-ohm
scale for any lock terminal, that lock relay is not functioning properly and unit should be
returned to the factory.