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Editing MHI Databases
• Trouble: This function type is used for various circuit types and for control modules.
Trouble type inputs operate LEDs only, no other outputs are allowed. This function type
is assigned by MHI automatically.
2.9.6 Message
The Message is located in the middle of the top of the window. This 3 line by 20 character text
message is displayed or printed for all signals originating from the current input point. Circuit
types that use devices have a default message created for them when defined. This message
can be changed.
2.9.7 Use Grp Message
The Use Grp Msg check box is used if the input point is to use a group message. A text entry
box appears when the box is checked. Enter the ID of the group message to be used. Only
one ID can be entered. If a group message is being used, it is displayed in the Message area,
but the message cannot be altered.
2.9.8 Input Circuit or Device Options
There are a number of options that can be used for each input circuit or device. Not all options
apply to all inputs. MHI only shows those options that are currently usable. The following
options are available:
• Enable Fan Delay: Controls the staggered turning off of Control Modules (relay). If
checked, Control Modules (relay) on this circuit are turned off in sequence, from the
lowest address to the highest address, at a rate set by the Fan Delay option in the Panel
Options Dialog, when Reset is pressed on the panel. The operation of Control Modules
(supervising) is not affected by this setting.
• Disable Maintenance Alert: Disables the addressable smoke or heat sensor from
reporting Maintenance Alert. Maintenance Alert is defined by the device staying at
almost alarm threshold for an extended period of time. This is usually an indication that a
smoke sensor requires cleaning. Heat sensors in high temperature areas may need the
Maintenance Alert disabled to limit nuisance troubles. Standard room temperature
(20°C) does not cause a Maintenance Alert on a heat detector.
• Code Bells: Checking this option causes only selected coded bells to sound coded
signals. If coded bells are used the following options are then also shown:
-- No Restore: If checked, the panel does not sound the Code again when the input
restores. If not checked, the panel sounds a single round of the Code when the
input restores
-- Code: This is the sequence that is sounded when an alarm is received on this input.
It can be up to 4 digits long. Hexadecimal digits are used, thus each digit can be
from 1 to F, where A=10, B=11, C=12, D=13, E=14 and F=15.
-- Round: This is the number of times the Code is repeated. It can be between 1 and
4 times for no restore inputs, and between 2 and 4 for restore inputs. Note: A
minimum of three rounds of code is required per NFPA 72.
• Night Sens. and Day Sens.: Selects the Alarm threshold sensitivity for addressable
smoke sensors. Heat sensors always use Normal sensitivity. Increased sensitivity
causes alarms at lower levels of smoke. Sensors not attached to a switch always use the
Night Sensitivity. Sensors attached to a switch use Night Sensitivity while the switch is
Off and Day Sensitivity while the switch is On. Night Sensitivity must always be equal to
or more sensitive than the Day Sensitivity.
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