RS-485

It is one of the serial interface standards for communicating between devices established by the IEA, and is a higher standard of RS-422.

As with RS-422, the transmitting side uses "TxD +" and "TxD-", and the receiving side uses "RxD +" and "RxD-" as a set of two signal lines.

The two signals are always transmitted in an inverted state, and a differential signal is used to distinguish between 0 and 1.

Cable lengh	Transmission speed	Number of connectable units	I/O methods
1200m or less	10Mbps	32 : 32(Max.)	Balanced type（differential type）

The difference from RS-422 is that N-to-N multipoint connection is possible.