Specifications

Alto 818 Installation and Operation
6-28 P/N 66109074001 Rev. D
6.3.20 STATUS
When the STATUS command is invoked, a system status report is generated and displayed at
the terminal port (the report can be printed, if required). Status is reported on the building mode
(open, limited, or closed), tamper switches, system power, system sensors, MSMs, VIPs, and
VIP tamper switches.
The anti-tamper monitoring function monitors the status of the tamper switch under the cover of
the Alto 818 and, if used, of an auxiliary tamper input from the RS-485 connector (usually a tamper
switch located under the cover to the equipment enclosure in which the ACU is housed).
| Building Mode | Tamper | Power | Alarm |
|-------O-------|----A---|-------|-------|
|######| Door | Coax | SnSr | Reader | VIP | MSM | MP1 | MP2 | MP3 | MP4 |
|--#1--|------|------|------|---------|----NP---|---F-|-----|-----|-----|-----|
|--#2--|------|------|------|---------|----NP---|---F-|-----|-----|-----|-----|
|--#3--|------|------|------|---------|----NP---|---F-|-----|-----|-----|-----|
|--#4--|------|------|------|---------|----NP---|---F-|-----|-----|-----|-----|
|--#5--|------|------|------|---------|----NP---|---F-|-----|-----|-----|-----|
|--#6--|------|------|------|---------|----NP---|---F-|-----|-----|-----|-----|
|--#7--|------|------|------|---------|----NP---|---F-|-----|-----|-----|-----|
|--#8--|------|------|------|---------|----NP---|---F-|-----|-----|-----|-----|
O = Open L = Limited C = Closed
F = Fail S = Shunted A = Active U = Normal Unlock NE = Not Enabled
HO = Held Open FO = Forced Open TS = Tamper Shunted TA = Tamper Active
Figure 6-11: Example of STATUS Display
The power failure monitoring function is operative only when the Alto 818 is powered by an
uninterruptible power supply using DC battery backup power. On such systems, the POWER
FAIL message indicates that the system is operating on DC battery power and that the battery
power is getting low. Power status is determined by monitoring pin 7 on the power connector of
the Alto 818. On systems that do not use backup battery power, the power failure report (field
5) in the SYSTEM command should be set to 0.
System faults that are reported include coaxial cable failure, sensor failure, MSM failure, power
failure, and tamper detection. Once the latched alarm contact (L-ALARM) on the Ann/C is
activated, the word ALARM is printed in status reports until the SILENCE command is entered.
The Alto 818 automatically sends a status report to the terminal port when entering or attempting
to enter the building-closed mode from a station sensor. The status report lists all active events
even though the actual reporting time may not be valid. An example of a status display is shown
in Figure 6-11.