07 April 2008
In a centrally controlled system the supervision software can periodically connect to the OnCell IP modem opening a TCP socket, and send and receive serial data. In this scenario, the TCP Server mode is the perfect fit.However, for those applications that wait for end devices to connect to the supervision software and notify events or send data, TCP client mode makes the OnCell IP Modem establish the connection whenever serial data is available. This is in fact on demand serial data transmission through a cellular network.UDP transmission mode is connectionless - eliminating the overhead of establishing connections – and it provides a direct send and receive mechanism.Preserving Legacy SoftwareSupervision software is usually designed to communicate over serial ports. Moxa’s RealCom mode offers a serial COM port to the supervision software, using Moxa’s RealCom driver. The application remains unchanged and still interfaces a serial port through the cellular network.Designed for the cellular environmentOnCell G62110/G63150 were designed with the particular environment found in cellular networks in mind. The connection between the OnCell IP modems and cellular networks can be configured as 1) always on,2) inactivity time-out and3) remote host covered.These options meet the different scenarios found, and they greatly reduce the effort of deploying cellular communication solutions.Data Security and Industrial DesignData loss is unacceptable in any industrial application. For this reason, the OnCell IP modems provide 256 KB serial data buffer. This avoids any data loss if the cellular network becomes temporarily unavailable. IP Modem security is guaranteed through SS / SSL.Moxa’s industry focus in product development includes dual power input, IP30 rating, fan-less design, magnetic isolation protection and two digital inputs, Ethernet link power status, alarm by relay output and e-mail.
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