A port allows the workstation to connect to an external device. A standard coding technique for representing computer information. A single line connects a host and an individual terminal. Data is transmitted one character at a time.
Unequal intervals can occur between transmitted characters.
The asynchronous protocol is used for dial-access communications with OCLC online services. COM ports 1 through 8 are supported. One baud may be, but is not necessarily, equal to one bit per second, because a signal element may comprise more than one bit. block A group of bits or characters transmitted as a unit. A procedure generally encodes the block to detect and correct errors. You transfer these blocks with the Send key.