Specifications

Alto 818 Installation and Operation
4-12 P/N 66109074001 Rev. D
4.5 LOCK WIRING INTERFACE
As shown in Figure 4-9, up to eight door locks can be controlled by the Alto 818 via the relays
connector.
Figure 4-9: Door Lock Interface Wiring
The maximum current each relay contact can carry is 3 amps with an inductive load at 120 VAC.
The returns are tied together in pairs (Lock 1, Lock 2 return is 1, 2 Common, etc.). These returns,
however, are isolated from the ACU ground. Lock twisted pair wiring must be able to meet the
requirements of the National Electrical Code.
Software control, the DOOR command, can be used to configure the system for a reverse lock
(closed when power is applied).