Spectra-Physics Tsunami - Differences between the Lok-To-Clock Implementation and the SCPI Standard

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Lok-to-Clock Electronics

8-21

*TST?

—executes a self test. The reported value is:

0 – test was successful

1 – no reference oscillator input signal

2 – no laser photodiode input signal

*WAI—executes a “no-op.” The Model 3930 implements only sequential

commands (no command is executed until the previous one is completed).

Thus, this “wait” command is essentially a “no-operation.”

Differences between the Lok-to-Clock implementation

and the SCPI standard

1. Only the four-letter forms of the commands are implemented. The

“long form” of a command will not be recognized.

2. STATus:OPERation:EVENt and STATus:QUEStionable:EVENt must be

sent in their entirety. The Model 3930 will not recognize the default

“EVENt” node.

3. MIN and MAX may not be sent when numeric data is expected. For

example, “:LDLY MIN” will generate an error, whereas the SCPI stan-

dard requires it to be interpreted the same as “:LDLY 0".

4. Rounding and interpretation of numeric data is not as robust as the

SCPI standard requires. Do not send numbers in exponential format.

For example, “:LDLY 100" will be interpreted correctly, whereas “:LDLY

1E2

” will not.

5. The Model 3930 interprets a carriage return as a legal terminator

(

SCPI mandates line feed). A carriage return/line feed combination is

also acceptable.

6. The :LDLY <parameter> command and :LDLY? query must be sent indi-

vidually. They may not be combined with other commands, or with

each other.

4 MAV Message Available

5 SESR Summary bit for the Standard Event Status

6 RQS Service request summary

7 OPER Service request summary

Bit Name Comments