XITRON 2000I, Руководство пользователя

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84
2000I & 2000M User Guide, Rev B
Command Description
UA Unlocks all ranges: voltage and current
U1 Unlocks the 20 volt Range
U2 Unlocks the 2 volt Range
U5 Unlocks the 20mA Range
Command String Usage
Xitron Technologies assumes the user is conversant with the send and receive
data commands when using the actual computer interface and with the
language used to control the 2000 instruments. Xitron Technologies also
assumes all command strings (those shown enclosed in quotation marks) are
followed by the
carriage return and linefeed characters. Note that it is
unnecessary to send the quotation mark characters and that the final character
is sent with the
EOI line asserted (UE2000 interface).
Setting an Output Voltage or Current
Sending the character string “K0+10.0VO” commands the 2000 instruments
to output a voltage of +10V. Note that the
K0 portion of this string deselects
the Calculated mode to ensure that the instrument is in the “Operate” mode.
Voltages of +10.23mV and -3.456
µ
V are similarly commanded by the strings
“K0+l0.23mVO” and “K00-3.45
µ
O” respectively. Note the condition shown
in the later example where negative quantities require numeric entry be
started before the entry of a negative polarity (avoiding the polarity character
performing a change in the present output polarity), this is readily achieved
by sending the 0 character prior to the actual numeric quantity (this may be
performed for either polarity of numeric data). Note further that any
additional digits beyond the capabilities of the instrument are ignored (thus
the output level will actually be set to -3.45
µ
V in the latter example).
Similarly to the voltage output examples shown above, current outputs may
be commanded also. For example, if output levels of +20.6543mA, -0.1mA or
+10.5
µ
A are required, then the strings “K0+20.6543mAO”, “K00-0.1mAO”
or “K0+10.5
µ
AO” respectively, would be transmitted to the 2000
instruments.