Appendix E, ALPHABETICAL LISTING OF COMMANDS
E-25
n Trigger
0 Trigger generated once per curve, at start of curve
1 Trigger generated once per point
TRIGOUTPOL [n] Curve buffer trigger output polarity
The value of n defines the polarity of the trigger output generated when a buffer
acquisition is run in accordance with the following table:
n Trigger Output
0 Rising-edge
1 Falling edge
USBTERM [n] Set/read USB terminator
The value of n sets the USB terminator according to the following table:
n Function
0 A null character (ASCII 0)
1 A null character (ASCII 0), followed by a byte representing the value of the
status Byte (table 6-1), followed by a byte representing the value of the Overload
Byte (table 6-1)
VER Report firmware version
Causes the lock-in amplifier to respond with the firmware version number, as also
displayed on the Configuration menu.
VMODE [n] Voltage input configuration
The value of n sets up the input configuration according to the following table:
n Input configuration
0 Both inputs grounded (test mode)
1 A input only
2 -B input only
3 A-B differential mode
Note that the IMODE command takes precedence over the VMODE command.
VRLOCK [n] Virtual reference mode lock
The Seek option of the frequency sweep mode must be used before issuing this
command, for which the value of n has the following significance:
n Mode
0 Disables virtual reference mode
1 Enters virtual reference mode by enabling tracking of the signal frequency
X[.] X channel output
In fixed point mode causes the lock-in amplifier to respond with the X demodulator
output in the range ±30000, full-scale being ±10000.
In floating point mode causes the lock-in amplifier to respond with the X
demodulator output in volts or amps.
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