Friday, September 7, 2012


Many devices in the industrial environments are still using an RS-232 serial communication link. RS-232 uses two signal levels to distinguish between a logical "1" and a logical "0". A logical "1" is represented by -12 Volt and a logical "0" is represented by +12 Volt. RS-232 can operate on different bit rates, standard values lie between 110 bit/s and 115200 bit/s. To synchronize the sending and receiving devices, start and/or stop bits can be added to the data to transfer. RS-232 supports a simple validity check of the transmitted data, using a parity bit that can be added to the data. Two signal lines are available, TxD (Transmit Data) and RxD (Receive Data). These can be used simultaneously, which makes full-duplex communications possible. 

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