Chapter 6, COMPUTER OPERATION
6-32
bit number bit negated bit asserted
0 data = 7 bits data = 8 bits
1 no parity bit 1 parity bit
2 even parity odd parity
3 echo disabled echo enabled
4 prompt disabled prompt enabled
DD [n] Define delimiter control
The value of n, which can be set to 13 or from 32 to 125, determines the ASCII value
of the character sent by the lock-in amplifier to separate two numeric values in a
two-value response, such as that generated by the MP (magnitude and phase)
command.
ST Report status byte
Causes the lock-in amplifier to respond with the status byte, an integer between 0
and 255, which is the decimal equivalent of a binary number with the following bit-
significance:
Bit 0 Command complete
Bit 1 Invalid command
Bit 2 Command parameter error
Bit 3 Reference unlock
Bit 4 Output overload - read overload byte to determine location
Bit 5 New ADC values available after external trigger
Bit 6 Input overload
Bit 7 Data available
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)
N Report overload byte
Causes the lock-in amplifier to respond with the overload byte, an integer between 0
and 255, which is the decimal equivalent of a binary number with the following bit-
significance:
Bit 0 X(1) channel output overload (> ±300 %FS)
Bit 1 Y(1) channel output overload (> ±300 %FS)
Bit 2 X2 channel output overload (> ±300 %FS)
Bit 3 Y2 channel output overload (> ±300 %FS)
Bit 4 CH1 output overload
Bit 5 CH2 output overload
Bit 6 CH3 output overload
Bit 7 CH4 output overload
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