Connected in series, one after the other. Transmitted signals go to the first device, then to the second and so on. For example, the Small Computer System Interface supports daisy chains (see SCSI
A SCSI Daisy Chain
Both internal and external SCSI devices are daisy chained together. Each device has an "in" and "out" port.
Dual Ported Devices
Daisey-chained devices such as this early SCSI slide scanner have two ports.