RF500
Description
The RF500 Gateway is an embedded system to provide a web-server interface. Only some of the external
connectors are intended for customer use (see Connector Restrictions). A number of software ports are in-
use and are listed separately below. The Gateway once connected to a network, via Ethernet, allows client
users access to the web-server interface via his or her own PC running a suitable web browser, Comark has
tested the following browsers:
• Microsoft Internet Explorer 8 and above
• Firefox 4.x & 5.x and above
• Chrome 12.x and above
However additional browsers such as Opera & Safari should work without issue.
Alternately the Gateway can be connected to a PC via crossover cable or through a modem connection (if
fitted). There is no software to install for client users to gain access to the system, all interfacing is done
through the website. The Gateway stores all data and setup information internally. The Gateway can be
backed up remotely using optional PC based software (RF500 & RF500LITE only). The Gateway is battery
backed up in the event of mains failure and providing an Autodialler and BT Analogue direct line is
connected, alarm messages can be sent from the Gateway during a power-cut. All access to the website is
protected by username and password.
Fit and Forget
Unlike other systems, the RF500 Gateway is a fit and forget device. Placement of the Gateway in any
system is determined by radio frequency testing during a survey, but essentially can be located anywhere on
the LAN. It does have LED’s for alarm indication and fault indication but no other user interface is available.
All connection to the Gateway for data view, alarm acknowledgement and programming is via password-
protected login using the web browser interface.
The Wireless Interface
RF500 utilises a licence free band in the 2.4GHz region. It is important to recognise that although there are
some similarities between RF500 and WiFi the two are completely different and should not be thought of as
being the same. The radio system used by the RF500 is not WiFi or WiFi based in any way shape or form,
hence IP packets cannot be transported over Comark wireless.
The RF500 wireless monitoring system uses the wireless interface only to send data between the Gateway
and transmitters using a proprietary format and recognises data packets of our own design.
Basic Specification
Centre Frequency: 2.405GHz
Bandwidth: 5MHz
Transmitted Power: 1mW
Raw Data Rate: 250Kbs
*Actual Throughput (estimated): 2Kbps
Modulation Technique: QPSK
Spread Spectrum Technique: DSSS
*This depends on distance from gateway.
The bi-directional RF link between Gateway and transmitters is based on an IEEE 802.15.4 physical layer
and an entirely proprietary application layer, thus ensuring the security of the link.
Gateway-IT-Note-Issue-10 Page 3 of 9
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