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AutoLog® RTU - Communication
AutoLog® RTU devices can communicate with control room using many alternative communication networks. In addition RTU devices can communicate with each others and with mobile phones. AutoLog® RTU devices are remotely maintainable. e.g program changes can be downloaded remotely. Communication networks Selecting suitable communication network starts normally by analyzing already available networks in the area. RTUs can be connected e.g. to wired TCP/IP or RS-232/485 based network. In many RTU projects wire bound networks are not available and distances are too long to implement wirings cost effectively. Next step is to analyze available wireless networks in the area. GSM network can be used cost effectively if application doesn't need continuous polling. Satellite network can be used in some areas where GSM network is not avalilable. Radio network is used in many RTU projects where other networks are not avalilable. Radio network allows continuous polling without usage costs. In some cases customer wants to use radio network also for voice calls. In this case e.g. some private trunked radio network like TETRA can be used. Note that different communication networks can be used together in the same project. FF-Automation can help customers to find the most suitable communication network solutions for their application. RS-232 / 422 / 485 -network AutoLog® RTU can communicate via wired RS232 / RS422 / RS485 -networks without modem but only limited distances. If the distance is over 15m (RS-232) or ~1200m (RS-422/485), some modem is needed. PSTN / Leased line -telephone network AutoLog® RTU can communicate using PSTN -telephone network with modem. Used protocol is e.g. Modbus RTU. Leased line is rented line, which is "always on". Internet / Intranet -network AutoLog® RTU can communicate in networks, which support TCP/IP -protocol like Intranet- and Internet -networks. Used protocol is e.g. Modbus TCP. Radiomodem -network AutoLog® RTU can communicate using radio modems. Communication distance depends on e.g. used trasmitting power, antenna height, antenna gain and landscape. Maximum distance can be tens of kilometers. With repeaters or combined LAN/radio network, the coverage area can be extended. GSM -network AutoLog® RTU can communicate using GSM network. It uses SMS messages and GPRS packet data transmission. In some special applications also circuit switched GSM data can be used. Normally the most cost-effective way is to use both SMS messages and GPRS data transfer. GSM communication is low-cost and easy to implement. Almost global network is already available so there's no network investment or maintenance costs. Existing mobile devices can be used to get alarms, reports, make controls etc. GSM network allows spontaneous communication i.e. alarms can be send immediately without polling. Cost effective solution if application doesn't need continuous polling. TETRA -network AutoLog® RTU can communicate using wireless TETRA (Terrestrial Trunked Radio) network using SDS messages or TETRA IP. Suitable solution to customer's who are authorized to use TETRA network. TETRA network is used by public safety and security users and big companies and organizations. Other possible networks:
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