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10 years, 6 months ago.
duplex communication
which duplex is suitable half or full for the transfer data between microcontroller to a smart meter via Modbus RS 485
2 Answers
10 years, 6 months ago.
RS485 is a serial differential bus system where only one device is allowed to transmit, otherwise you will get collisions. So that's why it is half duplex. If there is more than one active/transmitting device on the network, you need an arbitration mechanism, like using tokens (that's what Profibus does). With modbus you send a request and simply wait for feedback.
10 years, 2 months ago.
many thanks As i need to connect my smart meter to my mbed-board (lpc1768) so i am using ethernet connection between meter and board. modbus protocols are need to write on boared to revive information from meter. thanks