DMR is mostly used by the clients for emergency operations or pure voice radio. But at the same time DMR offers something special, which can be used for both: the existing infrastructure and a saving potential accomplished by solutions, which normally are achievable only with enormous investments when using conventional technology. 

Data Transmission on the 2nd Time Slot! 

All 30ms speech and data are alternately transferred at the same frequency. This means, while using the voice radio on the first time slot the data transmission can be taking place on the second time slot without any interference regarding the communication on the first time slot. In comparison to other solutions the specific advantage is obvious as many applications of GPRS, UMTS or LTE connections and also the monthly fees which accrue become superfluous. Therefore the operating costs can be reduced at the locations of the company. Furthermore many locations often can not be incorporated as they are located outside of the operating range of all network providers so from the economic point of view a dedicated lane specially installed no longer can be argued, but often this is the only solution.

What was missed up to now and why radio add value for the supervisory control technology! 

Network providers focus on high data traffic available in real time and also on sophisticated visualizations to retain customers to the provider’s infrastructure and rates. But what kind of information are required: We do not observe production lines or big power stations but a range of photovoltaics, water-level reporters, pumping plants, small block-type thermal power stations, wind power plants, fault indicators, ... - a few of deterministic data points which need to be transmitted. 

The "Radio Master" and "Radio Client" communicate via a serial interface with the Hytera Radio. Each system has a LAN interface for the configuration set up (optional to use the IEC 60870-5-104 communication standards), two further RS232 interfaces for service and connections of external devices (optional to transfer the IEC 60870-5-101 protocol), an S0 pulse counter and 16 I/Os (8in + 8out). 

If additional I/Os will be needed, up to eight “RADio Slave I/O” modules (each with sixteen separated I/Os) can be cascaded via the integrated RS485 interface. A comfortable web interface allows via a web browser to configure the entire system and to link the I/Os which each other. 

Telecontrol/remote control:  

n the control center, the RADio Master and the cascaded RADio Slave I/Os will map the RADio Clients from the remote locations to display the status at the control system. The RADio Master offers the communication standards IEC 60870-5-101 or IEC 60870-5-104 optionally in order to display the remote locations in the control system. The status of the I/Os between RADio Master and RADio Client will be deterministically aligned.

Data point query with the polling process: 

Some applications may require an own radio network with several RADio Clients and even several RADio Masters. The RADdio Master allows to configure a defined time interval to query sequentially the corresponding I/Os from the linked RADio Clients and RADio Slave I/Os. This polling process allows to use either both time slots for data transmission, or the use of only one time slot is possible.