Honeywell FS24X Plus User Manual page 46

However, obtaining the rich information in the Main Window requires setting up the
communications parameters. This is accomplished with the Communications Parameters form
which is shown in Communications Parameters window.
At minimum, two fields must be set to enable communications.
The first field is the port name. MS-Windows assigns the name COM1, COM2 ... COM99 to serial
devices. These are typically devices plugged into a USB port, including possibly the FS24X Plus™
itself. On many computers, selecting the COM port number will be trivial because the flame detector
will be the only port present. In PCs with many devices connected, it may be necessary to observe
which COM port appears and disappears from the list when the FS24X Plus™ is connected.
The second field is the communications media type – either USB or RS-485. To set this, check or
uncheck "Com Port is USB" as appropriate. Either medium uses Honeywell's proprietary FP2
protocol.
USB is more convenient than RS-485 because there is no need to configure baud rate, parity, or stop
bits. It is faster than the default RS-485 speed of 9600 baud and no special hardware is needed. USB
alone is sufficient to power the detector and permit configuration. However, when 24 VDC power is
absent, the relays will be de-energized, and the detector will continuously report a fault.
However, RS-485 is advantageous in that it can be accessed while the detector is in the enclosure, it
tolerates a longer length of up to 1200 meters [4000 feet] and is faster if configured for the highest
baud rate. It requires an RS-485 transceiver which most computers lack. Honeywell® does not sell
RS-485 transceiver but has used Advantech BB-USOPTL4 extensively. This and similar devices can
be purchased multiple distributors. RS-485 communications require that the communications
parameters (baud rate, parity, and stop bits) match on both ends. The default communications
parameters are 9600 baud, even parity, and one stop bit. Long or fast networks require correct 120Ω
termination resistors on both ends. The live streaming feature requires either USB or RS-485
configured for the maximum speed of 115,200 baud.
The FP2 does not support multidrop networks – installations wishing to communicate with multiple
FS24X Plus™ Flame detector must have a unique pair of wires and RS-485 transceiver for each
detector.
Honeywell®FS24X Plus™ | User Manual
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