What is the maximum number of devices that can be connected in a USB daisy chain?

The maximum number of devices that can be connected in a USB daisy chain is 127 devices. This limit applies to USB 1.1 and USB 2.0 specifications. Each USB device takes up a unique address on the bus, and since the USB protocol allows for 127 device addresses (ranging from 1 to 127), this determines the maximum number of devices that can be effectively connected in a chain.

USB hubs can facilitate the connection of multiple devices, as each hub can support additional devices, further contributing to this total. However, it's essential to stay within the maximum count of 127 devices on the USB bus itself to maintain functionality.

This design ensures that the USB bus can efficiently manage communication with all connected devices without overwhelming the system, as each device must be addressable for data transfer but unable to exceed the defined limit.