Specifications

Alto 818 Installation and Operation
4-18 P/N 66109074001 Rev. D
4.9 SE 778-A INTERFACE WIRING
The Alto 818 interfaces with the SE 778-A Annunciator/Control panel (Ann/C) by means of a 15-
conductor cable which is connected to the annunciator connector on the ACU; see Figure 4-14.
The maximum length of this cable is 15 feet (4.4 M).
Figure 4-14: SE 778-A Annunciator/Control Panel Interface (with Remote L/C Station)
The terminals labeled L-ALARM on the Ann/C are a set of latched contacts that are typically
connected to an audible alarm as shown in Figure 4-14. As programmed by the Alto 818, these
contacts will latch closed for a specified alarm condition, causing the alarm to sound. The L-
ALARM contacts can only be unlatched by use of the SILENCE command or the RESET
command or through a power failure.