3.9
Input Buffer
and
Output Data
The Input buffer of the LDC-3700 Series Laser Diode Controller is 80 bytes. However, the user's <PROGRAM
MESSAGE>
may
be
longer.
The output (response)
data
of the LDC-3700 Series Laser Diode Controller is sent
in
blocks of up to 80 bytes in
length.
It
is sent using high
speed
DMA within the LDC-3700 Series Laser Diode Controller, but may
be
of
indefinite length. Although some commands have a definite length response, such
as
the MESsage? query, the
response length is indefinite
because
the LDC-3700 Series Laser Diode Controller
will
respond to multiple queries
in a single response output. The user may enter
as
many
queries
as
desired
in
a single input message, and the
LDC-3700 Series Laser Diode Controller
will
respond to all of them
in
the same output message,
if
possible. For
example, the user may enter the following command:
"Mes?; Rad?; TEC:T?; Err?"
The response may appear
in
this manner:
All
query responses are evaluated at the time the query
is
parsed,
and not at the time the response message is sent.
In most cases this does not create a problem since the time between parsing a query and sending
its
response is
small, unless the GPIB controller takes a long time to request the response.
3.10
Remote Interface Messages
The following sections are intended
as
a reference for using the LDC-3700 Series
Laser
Diode Controller with the
GPIB option when an understanding of the lower level interface messages is required. These sections deal with the
remote interface messages which are available with the LDC-3700 Series Laser Diode Controller, and
they
contain
a
list
of
the Interface Function subsets. This information is generally not required
by
the user unless there is
a
question of compatibility of the LDC-3700 Series
Laser
Diode Controller
with
a
specific controller.
A
list
of
interface messages
whch
are not supported
by
the LDC-3700 Series Laser Diode Controller is shown in Section
3.10.3 These messages will
be
ignored
by
the LDC-3700 Series Laser Diode Controller.
The interface messages listed
in
this chapter
are
handled
by
the 9914 GPIB interface
IC
and the 80C188 processor
in the LDC-3700 Series Laser Diode Controller, and are transparent to the higher level
commands.
However,
they
may
be
explicitly
used
in
some GPIB programs.
A
list
of the LDC-3700 Series
Laser
Diode Controller's allowable
interface messages is shown in Section
3.9.2.
3.10.1
Interface Function Subsets
Table 3.3 contains the remote Interface Function Subsets which
are
supported
by
the LDC-3700 Series Laser Diode
Controller. For more information,
see
the ANSVIEEE-488.1-1987 standard.
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