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Overview of the S-LX
The S-LX system comprises of 3 main components mounted on standard DIN rail.
Power supply
The system is supplied through a product-approved isolated BX110 (or domestic mains) to B24 power supply. A single power supply will power 2 x S-LX computing modules and 4 x HZS232 port sniffers inclusive.
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- The HZS232 "taps into" RS232 serial lines using an application specific cable set
- The device presents a high-impedance to monitored serial lines, and a fail-safe design, meaning it will not adversely affect the operation of the monitored serial link.
- The device also "isolates" the signal. It can be thought of a as a "data diode". It is not electrically possible for the S-LX computer to interfere with the data on the monitored serial link.
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VHLC
How is it
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installed?
When utilised to monitor a VHLC level crossing, the condition monitoring data-feed between the VHLC rack and the in-situ monitoring PC is intercepted.
What data is available?
How is the
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data is
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presented?
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HXP-3
How it is connected?
hen utilised to monitor a HXP-3 track circuit, the condition monitoring data-feed between the HXP-3 rack and the in-situ monitoring PC is intercepted. If an existing S-LX device is in-situ monitoring the VHLC crossing, then both S-LX devices may share a power supply, and the HXP-3 S-LX device does not require a modem. It can be networked to the VHLC S-LX device.
What data is available?
There are 3 sets of data available on one HXP-3 controller for each of two tracks. The values are:
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Receive level, and received phase is available as a real-time data stream for both tracks. The "Ring Status" is a series of (undocumented) bits which can be seen to change as the predictor changes state. It should be possible to label these by comparing the VHLC data and the predictor data.
Real-world sample data can be seen on the graph below.
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- The data is known to be untidy (the glitchy section shortly before the track clears) at the point where the train is "on-top-of" the predictor.
- The vertical section in the trace during clearance is due to the line section being artificially shorted with a block joint (upper track, see blue ring in diagram). Track diagram:
How is he data is presented?
This is entirely up to the customer. With no HXP-3 installs presently live, the opportunity exists to work with Mpec to develop a data visualisation and alarm strategy within Centrix that suits the needs of your daily operations.