Monitor and log SELCAL traffic of a mobile fleet within a PC environment

The 970 SELCAL Monitor package (SELMON) provides the user with the ability to receive and display SELCAL signalling information from within a PC environment. SELCAL radio traffic can be logged and exported to other programs for analysis and for record keeping.

 

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970SM SELCAL Encoder/Decoder with radio and PC

The 970SM provides the hardware interface between the PC and the radio equipment. The SELMON program is a Windows application that displays received SELCAL messages. Each message is time stamped and associated with an alpha tag.

 

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Simply control a remote relay through a SELCAL message

The 970SM features a number of digital outputs, including a relay, that can be controlled from received SELCAL messages. Using a Windows utility, each output on a 970SM can be associated with a SELCAL string. Then when the device receives a pre-programmed string (from a mobile user, for example) it will activate or deactivate the corresponding output.

The above example shows how a remote lamp can be switched on and off over a radio link using SELCAL commands.

 

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Implement machine-to-machine control over a landline

 Argus System point-to-point or point-to-multi-point using fast polling; small I/O count; high frequency changes
 MaxIO system, for large I/O count

The Omnitronics Argus range of telemetry products provide machine to machine control in point-to-point or multi-point applications. The Argus Field Unit is the low cost member of the family in a small pre-packaged design. The Argus MaxIO uses a 3RU 19 inch rack design providing expansion capabilities.

The example shown above uses the Argus Field Unit RTU. This example shows the connection via an Austel landline (connections across private wires can be made direct to the RTU).

RTUs are programmed in the factory, according to the client’s application, to work as part of a networked system.

In landline applications, communications is normally configured to use polling. This is the most reliable method of ensuring that information is transferred between devices. The Master RTU is responsible for polling the network of Slave RTUs in sequence.

Note that an Argus Field unit comes standard with 4 analog and 8 digital inputs and 8 relay outputs.

Example parts list
9000/12 Series Argus Field Units Two
925FR Line Keying Interface (optional) Two

 

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Implement machine-to-machine control over a radio link

In radio applications, it is common to use reporting by exception with a periodic network poll by the Master RTU. This reduces the amount of data traffic over a radio network.

Example parts list
9000/12 Series Argus Field Units Three
9000/03 Height Extender Three
9000/04 Maxon Radio Module Three

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Remote monitoring & control over the public switched or mobile phone network

Some applications are ideally suited to mobile phone implementations. Typical applications involve events that seldom change such as security monitoring or base station alarms. The Argus range can be configured to work with PSTN, GSM or CDMA networks, using third party modems.

The example above shows how security at two base stations can be monitored at a central workshop. Operators at the workshop also have the ability to perform a switch-over at each site as a result of the reported status.

 

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Centrally control & monitor multiple remote digital and analog processes

Omnitronics telemetry systems can be integrated into an SCADA application that supports the Modbus protocol. The telemetry hardware can then be programmed to perform the client’s application under the control of the SCADA program. The advantages of such a system are:

a) The telemetry system handles communications efficiently and transparently to the SCADA program. This is especially useful in radio applications where event reporting should be used

b) The client is free to write their own SCADA application, if desired.

An example of such a system is the Omnitronics Site Monitor, shown above.

 

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Use an existing voice radio network to transport telemetry data

An existing voice radio network can be adapted to also carry telemetry data. This is feasible in applications where data transmissions can be kept to a minimum. Otherwise they will start to impact on mobile users.

To achieve this, Omnitronics uses a system of reporting by exception (or event reporting). Digital input signals are only transmitted on change of state. Analog levels are transmitted when they cross pre-programmed thresholds.

Furthermore, the Omnitronics event reporting protocol incorporates a mechanism to reduce interruptions to voice conversations. This is called the Transmit Suspend function. This function allows network operators to specify a period of time that a radio network must be inactive before an RTU can generate a message. Typically, this is set to 5 seconds.

Event reporting, along with the Transmit Suspend function lessens the impact of data tones on mobile users and makes many applications feasible on existing analog voice networks.

 

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