ing. This way the controller knows when it is possible to
trigger the counter.
Measuring result ready indicates that the measure-
ment and calculation of the result is completed and that
the result is present in the output buffer. If SRQ for is se-
lected for this event, or Free-run is OFF, the counting
will stop until the controller has read the result.
Programming error is generated if the counter receives
messages with illegal syntax or values out of its range.
If ’Programming error’ is generated, the counter will stop
measuring. It will continue to receive and store correct
programming messages and use them when the error
status is reset and a new measurement starts.
Correct the program before resetting the status mes-
sage.
Use one of the following bus commands to reset the
status byte:
Go to local (GTL), Device clear (DCL) or selective de-
vice clear (SDC).
Any of the following messages will have the same effect
on the counter:
D, FNC?, MEAC?, INPA?, ID? or BUS?.
A serial poll will also reset the status message if the
SRQ mask is set for ’SRQ at Programming error’.
Hardware fault is generated when the counter displays
the codes described in ’Error codes’ in the ’Operating in-
structions’ in this manual.
Time-Out is generated when the set time-out period has
elepsed.
Possible Status Messages
Normal Measurement
The status byte changes as follows during a normal
measurement:
0, 2, 6, 22, 30, 14, 15, 0, .........
Deci-
mal*
Binary
76543210
Important
bits (X =
don’t care) Comment
0 00000000 Preparing a
measurement or, High-
speed dump or Volt
measurements in
progress.
2 00000010 XX0XXX1X Preparations ready. If
Free-run OFF
Deci-
mal*
Binary
76543210
Important
bits (X =
don’t care) Comment
6 00000110 XX0XX1XX Measuring start
enable.
22 00010110 XX01XXXX Main-Gate open
30 00011110 XX0X1XXX Measuring stop
enable.
14 00001110 Calculating the
measuring result.
15 00001111 XX0XXXX1 Measuring result
ready.
Error Conditions
Deci-
mal*
Binary
76543210
Important
bits (X =
don’t care) Comment
33 00100001 XX1XXXX1 Programming error.
34 00100010 XX1XXX1X Hardware fault.
36 00100100 XX1XX1XX Time-out.
* If Service request (SRQ) is enabled for an event, the
decimal value of the status message for that
event will be increased by 64. The reason for
this is that bit 6 will be set to one at the same
time as the bit indicating the event.
Output Mode
Setting the output mode selects the format in which the
counter will output measuring results to the controller.
Select output mode by sending OUTM <number> where
<number> is a decimal value between 0 and 4 depend-
ing on the selected output mode.
<number> High-speed
dump
Output
format
MTCXO
compen-
sation
0 OFF NORMAL ON
1 OFF SHORT ON
2 OFF NORMAL OFF
3 OFF SHORT OFF
4 ON FOR HIGH
SPEED
DUMP
OFF **
Default <number> is 0, when switching to local and back
again, the <number> will be reset to 0.
The MTCXO compensation can be switched off to in-
crease the measuring speed, providing a result with five
digits accuracy is sufficient. The time gained will be up
to 400 ms/measurement.
** Must be in the end of a program message.
GPIB-INTERFACE OPERATION Page: 27
PM 6669 - OPERATORS MANUAL
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