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2.7.6 Command Codes
The PMC responds to ASCII alphanumeric command strings (capital letters only). Only one
commend per message is permitted, terminated with a Carriage Return (CR) and Line Feed (LF)
characters or with a LF character alone. Space characters are ignored. Table 2.4 lists the available
commands and the resulting PMC action.
2.7.7 Command Sequence
The PMC uses keystroke equivalent programming. Each front panel key has an equivalent GPIB
command. GPIB commands are equivalent to those employed when the PMC is manually
operated. (See the Front Panel Operation Section 2.4 for details on Front Panel Operation). The
only front panel controls that are not duplicated with GPIB commands are the Modify Controls.
The following command sequence is an example, which sets the PMC to 25.82 Volts output at
55.43 HZ.
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STEP COMMAND RESULTS
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1. RES Select 60 Hz Mode. This line is optional. The PMC assumes 60
Hz mode if a frequency is requested between 50 Hz and 75 Hz
2. 60 Hz Selects 60 Hz Mode. This line is optional. The PMC assumes 60
Hz mode if a frequency is requested between 50 Hz and 75 Hz.
3. 55.43 Hz Sets the PMC Operating Frequency to 55.43 Hz.
4. V Selects Voltage Output Mode. This line is optional. The PMC
assumes voltage mode when a specific voltage is requested. (See
next step.)
5. 25.82 V Sets PMC for 25.82 Volts
6. OP Initiates output.
7. 26 V Changes output to 26 Volts.
8. STA Removes output (does not alter settings).
2.7.7.1 Diagnostic Tests
To run a diagnostic test, send the DTXX command where XX is the test number. Refer to the
Diagnostic Test Sequence Section 2.8.3 for details. The PMC ignores interface commands while a
Diagnostic Test is being performed. Upon completion of a test the PMC asserts SRQ and reports
either PASS code (50) or an Error Code (see Table 2.9). To return the PMC to normal operation
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