ACCESS.bus (A.b)

ACCESS.bus was developed for easy installation and configuration, using a bus topology that supports up to 125 devices. Although it was superseded by the USB, it is still a standard interface for a monitor to configure setup information to a host graphics card.

With the same I²C protocol, the A.b supports a bidirectional, two-wire serial bus with the following features:

• Hot swappable
• Backward compatible
• Supports seven-bit and 10-bit addresses
• Low-speed analog-to-digital and digital-to-analog controllers
• Master and/or slave devices can coexist on the same bus depending on the mode

Compared to a USB, one of the main advantages of an A.b is that it can be both a slave and a master. A USB can only be a slave. Since the A.b can be a master or slave it can connect several devices together without a host PC.

Another advantage of ACCESS.bus is that it can connect several devices together to make one daisy chain instead of requiring a massive cable. It can also support a hub. The disadvantage is that it has a slower data transfer rate than the USB.