
7.10 PC Host to IQ-400 Communication Using Fiber Optics (RS-485
Protocol)
PCSC has tested two fiber optics systems for communication between the PC host and the IQ
panels. Both were found to be acceptable and compatible with the IQ-400. It is recommended
that other systems available on the market should be equivalent to the specifications inherent in
the two products tested. PCSC does not endorse or specify either of these 2 systems. Any
communication links beyond the normal wiring of the IQ system is the responsibility of the fiber
optics company and the installer. Refer to the installation instructions of the fiber optics system
you are using. The information listed below is a general description of how one supplier,
American Fibertek, communicates via fiber optics data links, to the PC host and the IQ panel.
7.10.1 Product Description
The MX-485-2 is a remote mountable module that converts two-wire RS-485 data signals into
modulated light for coupling into fiber optic cables. The unit transmits and receives high and low
logic level data and the HiZ bus state through duplex fiber optic cables. Any EIA RS-485 protocol
signals up to 19.2 Kbaud may be transmitted over fiber optics cable by using two 485-2 series
units. Designed primarily to be used with inexpensive 50u fiber cable, the 485-2 series may also
be used with 62.5u fiber.
7.10.1.1 Connector
The signal and power connector is a seven position detachable terminal block. The connections
should be made as shown on the wiring diagram before power is applied. ST optical connectors
are standard on the unit.
7.10.1.2 Power Supply
Power required is 12VDC @ 200mA maximum. Internal regulators are included so unregulated
12 volt power may be used. The case of the unit is connected to signal ground.
7.10.1.3 Controls and Indicators
There are no controls on the MX-485-2 and three indicators. The ON indicator will glow green
when power is applied to the unit. The TX and RX LEDs glow red to show activity on the data
wires. The TX LED indicates the fiber modem is transmitting and the RX LED indicates reception
of data.
Page lxiv of 110 IQ-400 Installation Manual 33-10057-001-C
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