Implementing Distribution level SCADA using micro controllers. We need serial data transmission from DAQ unit to master control unit. For this purpose we need RS 485 or equivalent protocol.
RS-485 is a serial communication interface that is implemented in a bus. This bus can connect multiple devices which can be located at long distances. It consists of two differential data lines which are connected to the transmitter and receiver. This interface can be connected to a microcontroller which contains a UART interface using a level converter (eg DS75176)
National Instruments has some user guides on various interfaces, RS-485 among them. Search for "national rs485 app note"
It is recommended that you read some about RS232 as well, because RS485 is very similar to RS232, only difference is it uses only 2 wires for transferring the data.
You can learn a lot by reading about rs232 to rs485 converters too.
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