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Depends, is the device serial or parallel?
serial device
Serial
Multiple serial, gaming, USB, and parallel ports can be established with an I/O controller card. A controller card works as an interface between the motherboard and various components on a computer.
A "serial to parallel" converter converts a serial data connection to a parallel data connection. For example, in computer storage, there are controller chipsets that convert SATA (Serial ATA) to PATA (Parallel ATA, also called IDE or EIDE).
Serial ports only allow one device to send and one device to receive at a time, where a parallel port can send and receive data at the same time.
I/O controller card
Yes
Neither. A computer case is just a box to hold the parts of a computer. It provides no form of communication itself.
parallel
A telegraph key.
Some key differences between a Serial and Parallel Adder are that a Serial Adder is slower, a Parallel adder is a combinational circuit and the time required for addition depends on the number of bits in a Serial, but not a Parallel. A Serial Adder is a sequential circuit while a Parallel is a combinational circuit.