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4-2

Programming over RS-232-C

This section describes the interface functions and some general concepts of the

RS-232-C interface. The RS-232-C interface on this instrument is

Hewlett-Packard’s implementation of EIA Recommended Standard RS-232-C,

Interface Between Data Terminal Equipment and Data Communications

Equipment Employing Serial Binary Data Interchange. With this interface, data

is sent one bit at a time and characters are not synchronized with preceding or

subsequent data characters. Each character is sent as a complete entity without

relationship to other events.

IEEE 488.2 Operates with IEEE 488.1 or RS-232-C

IEEE 488.2 is designed to work with IEEE 488.1 as the physical interface. When

RS-232-C is used as the physical interface, as much of IEEE 488.2 is retained as the

hardware differences will allow. No IEEE 488.1 messages such as DCL, GET, and END

are available.

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Agilent Technologies 42D Guia do Utilizador Página 42