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FX-350 Series Installation and Operation Manual
23
Circuits and Devices
Addressable/Analog Devices
The FX-350 supports up to 3 loops of addressable/analog devices. The device loop can be used to connect up to
60, 126 or 378 analog devices and addressable input or output modules on an unshielded twisted pair (UTP). The
devices must be compatible with the Mircom device protocol.
The loop interface software continuously supervises the devices on its loop against those found during
configuration for the following conditions:
• device missing
• unconfigured device responding
• two or more devices responding to the same address
• wrong device type
A communication or addressing error on a device is reported as a trouble on the associated zone LED if configured.
The addressable loop can be configured for class A or B operation. "T-tapping" is allowed (Refer to device
installation documentation for details). A short or open on the loop will activate the common trouble sequence with a
latching trouble.
Devices on the loop have an optional LED which normally flashes when the device is polled and goes ON steady
when the device is active (alarm for an input device or active for an output device). The flashing of the LED on
polling for sensors can be suppressed during configuration. For input or output modules, the LED always flashes
when polling. The software limits the maximum number of the devices which can have their LED turned ON when
active to fifteen (15).
Certain devices are designed to support an optional external LED, which operates when the LED on the device is
activated. Remote/external LEDs must NOT be used on this system. The panel can provide up to 350mA of current
to the devices on the loop. A maximum line loss of 5 volts is permitted, so the loop distance, wire size, and
maximum number of devices are limited by this constraint.
The devices should be installed using unshielded twisted pair (UTP). The total line drop on the loop must not
exceed 5 volts at the last device.
The calculations required to determine the maximum permissible loop wiring
distance with various combinations of devices is relatively complicated, and when isolators are used, includes a
consideration of device inrush currents which must not exceed 20mA for a single isolator. In no case should more
that twenty devices be connected to a single isolator. To simplify the calculation process, please utilize the loop
calculator program located on the Mircom website at
http:/www.mircom.com
in order to determine maximum loop
lengths, number of devices, and wire sizes etc.
It is also important to note that the device LEDs present a significant extra load on the loop which must be
considered in calculating permissible loop lengths, battery capacities, etc. Please refer to the device Installation
Instructions and other documentation provided with the addressable devices, bases, and isolators for further
information.
The system will automatically limit the maximum number of device LEDs which can be
illuminated to 15.
Analog Devices
The system supports Mircom MIX-3000 Series photo, ion, multi-sensor and thermal (heat) type analog detectors, as
well as contact input and output devices. The detectors may be configured as non-verified or verified alarm inputs.
To determine an alarm condition, the system polls the analog device and compares the analog value against stored
thresholds for pre-alarm and alarm conditions.
A range of thresholds is provided for each type of analog device (except for contact devices), corresponding to the
agency approved range of threshold for a particular device type. Each device can be individually configured to a
value in the range of threshold for “day time” and one for the “night time” or after hours operation; i.e. a device may
be configured to a low sensitivity for “day time” and high sensitivity at “night time”. The day time threshold will be
used unless the after hours operation is active.
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