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PROGRAMMING AND INTERFACING
GPIB Device Dependent Commands Supplementary Information
Functional information is provided for the GPIB device dependent commands that require additional
information for use. The device dependent command such as “R0” requires a message delimiter such
as “X” and a terminator sequence such as “<LF> EOI” before it is executed by the instrument. Up to
32 characters may be accepted by the input buffer before the “X” command must be executed. The
information below is to be used with the GPIB command summary table to gain a complete
understanding of the command functions.
To acquire a reading requires three events to take place.
1) The trigger type must be selected and armed;
2) The previous trigger must be stopped and a new trigger must be instructed;
3) A new value must be returned after the 1750 completes a reading. Below is a breakdown of the
trigger modes and commands via GPIB interface.
Step #1 does not have to be done with all readings once the correct trigger mode is programmed. The
stopping of triggers applies only to continuous modes.
One Shot modes are stopped automatically.
T0, T1, T2, and T3 [Trigger on Talk]
a) Issue a T0, T1, T2, or T3 to select or arm the trigger. An address to Talk on the bus will stop
the old trigger and provide a new trigger to begin the next acquisition.
b) It will also return a reading after it has been completed by the 1750. One Talk command will
perform two separate actions.
T4, T5, T6, and T7 [Trigger on GET]
a) Issue a T4, T5, T6, or T7 to select and arm the new trigger. Issuing the GET command on the
bus will stop the old trigger and provide a new trigger to begin the next acquisition.
b) An address to Talk on the bus will return a reading after it has been completed by the 1750.
Returned ASCII Values:
a) “1.2345 mOhm” – A reading will be returned to the PC in this format.
b) “2.9999 or 29.999” – This returned value indicates that there is an over range condition.
This value may also indicate an open wire condition for ranges below 200 Ω.
Range – R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19.
Delay – Dnnn – where nnn=0-250 ms
Frequency – F0, F1
Trigger – T0, T1, T2, T3, T4, T5, T6, T7
Display Mode – P0, P1, P2
Terminators – Y0, Y1, Y2, Y3, Y4; CR= carriage return, LF= line feed, and EOI = end of information
NOTE: EOI is used only with GPIB.
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