3.6
Error
Messages
Error messages may appear on the TEC or LASER displays when error conditions
occur
which force the output off
or reflect
hardware
errors
in
the respective functions of the LDC-3700
Series
Laser Diode Controller. For example,
a
module open error
in
the TEC side of the LDC-3700
Series
Laser Diode Controller
will
be
displayed on the
TEC
display.
In most cases, the error message will
appear
for
three
seconds and then the display will revert to its former state.
In
the
case
of multiple error messages, the LDC-3900
will
show each new message
as
soon
as
it
is
detected.
ln
remote operation, the current error list
can
be
read
by
issuing the
"ERR?"
query. When this is done,
a
string will
be
returned containing
(up
to
10
of) the error messages
which
are
currently
in
the error message
queue.
Appendx
D
contains an explanation of the error messages
which
may
be
reported remotely
by
the LDC-3700
Series Laser Diode Controller.
3.7
Status Reporting
Figure 3.11 shows the status reporting scheme of
the
LDC-3700
Series
Laser
Diode
Controller.
Each
of the
regsten whlch may
be
accessed
by
a command or query
has
the appropriate command or query written above or
below the register representation. For example, the LASER Condition Register may
be
queried
via
the
"LASer:COND?" query,
as
shown
by
its register
heading
in
Figure 3.11.
The condition or event registers
are
logically
ANDed
with their respective enable registers. These
bits
are
then
logrcally
ORed
to form
a
summary
message
in
the
status
byte
for that
particular
register.
3.7.1
Event
and
Condition Registers
The
Event Regsters are
used
to
report
events which
occur
during the operation of the
LDC-3700
Series
Laser
Diode Controller. Events differ fiom conditions
in
that
events
signal
an
occurrence once, and
are
not reset
until
the
Event Register is queried or the LDC-3700 Series Laser Diode Controller is powered off. Conditions reflect the
current state of the device, and therefore may change many times during operation. Querying a Condition Register
does
not
change
its
contents.
The LDC-3700 Series Laser Diode Controller contains Event and Condition Regmers for
TEC
and
LASER
controller operations. It
also
contains the Standard Event Status Register which reports events for general
operation
of
the LDC-3700 Series Laser Diode Controller. The
Standard
Event
Status
Register conforms to the
IEEE-488.2
standard.
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