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Programming Over RS-232C
Introduction
Interface
Operation
HP 16528/l 6538
This section describes the interface functions and some general concepts
of the RS-232C. The RS-232C interface on this instrument is
Hewlett-Packard's implementation of EIA Recommended Standard
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
character is sent as a complete entity without relationship to other events.
The HP 1652B/53B can be programmed with a controller over RS-232C
using either a minimum three-wire or extended hardwire interface. The
operation and exact connections for these interfaces are described in
more detail in the following sections. When you are programming an
HP 1652B/53B over RS-232C with a controller, 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 Equipment) device.
When operating directly between two DTE devices, certain
considerations must be taken into account. For three-wire operation,
extended hardwire operation, protocol may be handled either with
link. For both three-wire and extended hardwire operation, the DCD and
DSR inputs to the HP 1652B/53B must remain high for proper operation.
With extended hardwire operation, a high on the CI'S input allows the HP
data transmission. Likewise, a high on the RTS line allows the controller
to send data and a low on this line signals a request for the controller to
disable data transmission. Since three-wire operation has no control over
the CTS input, internal pull-up resistors in the HP 1652B/53B assure that
this line remains high for proper three-wire operation.
data characters.
Each
Programming Over RS-232C
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