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to be taken by the Model 3501. The suffix “?” indicates the command is a
query that requests data from the Model 3501. The “WHL2” command is used
to set the type of wheel being used, and in this case, “2” is taken as a parame-
ter value.
Do not include decimal points in numerical data. So, to set the chopper fre-
quency to 1.23 kHz, send the command OSC123000. To set the phase to -90
degrees, send the command PHS-900.
Multiple commands on a single line must be separated by a semicolon (;).
Data to Host
Data returned by the chopper controller to the host computer consist of a
mnemonic, a data value and a line terminator. The mnemonic specifies the
parameter (WHL = wheel) or the quantity measured (FR1 = F
sync
frequen-
cy). Data is returned by the chopper with decimal points included (e.g.,
1230.0).
Data to the host will be followed with a line termination (line feed and EOI).
The line termination may be set when installing IEEE-488 into the host com-
puter. Consult the manufacturer’s installation guide for details.
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