
Programming Over RS-232C
Introduction
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 EL4 Recommended Standard
“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.
Interface
Operation
The HP
can be programmed with a controller over RS-232C
using either a minimum three-wire or extended
interface. The
operation and exact connections for these interfaces are described in
more detail in the following sections. When you are programming an HP
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,
must be used to handle protocol
between the devices. For extended
operation, protocol may be
handled either with
or by manipulating the CTS and RTS
lines of the RS-232C link. For both three-wire and extended
operation, the DCD and DSR inputs to the HP
must remain
high for proper operation. With extended
operation, a high
the CTS input allows the HP
to send data and a low on this
line disables 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
assure that this
remains high for proper three-wire
operation.
HP
Programming Over RS-232C
Содержание 1650B
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