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Interface
operation
Cables
Programming
Programming over RS-232
Programming over RS-232
This section describes the interface functions and some general concepts of
the RS-232 interface. The RS-232 interface on this instrument is Hewlett-
Packard's implementation of EIA Recommended Standard RS-232, "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 subse-
quent data characters. Each character is sent as a complete entity without
relationship to other events.
NOTE
IEEE 488.2 is designed to work with IEEE 488.1 as the physical interface. When RS-232
is used as the physical interface, as much of IEEE 488.2 is retained as the hardware dif-
ferences will allow. No IEEE 488.1 messages such as DCL, GET, and END are available.
The switch can be programmed with a controller over RS-232 using an inter-
face cable that is appropriate for your application. The operation and exact
connections for this interface are described in more detail in the following sec-
tions. When you are using a controller to program a switch over RS-232, you
are normally operating directly between two DTE (Data Terminal Equipment)
devices as compared to operating between a DTE device and a DCE (Data
Communications Device) device.
The type of RS-232 cable you use to connect the controller to the switch will
depend on your application. The following paragraphs describe which lines of
the switch are used to control the operation of the RS-232 bus relative to the
switch. To locate the proper cable for your application, refer to the reference
manual for your controller.
4-8
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