How to give Device-dependent command in Labview

I am using a Keithley Programmable Current Source (Model 224). When I try to read It gives a string(containing current, V-limit, dwell time).
NDCI +n.nnnnE+n, V+n.nn00E+n, W+n.nnnnE+n
According to the manual a device-dependent command like D0X will display Source, D1X will display Voltage limit and D2X will dispaly Dwell Time. I would like know how give these device-dependent commands.
Why cann't i get the proper result using the attached vi.
Attachments:
GPIB.vi ‏22 KB

I am including the SUB VI's here. The basic problem is to get the display of Source current reading only, with D0X command instade of all three parameters (Source current , V-limit, dwell time).
Mode 0 or Mode 2 is not giving any desired result.
Yes, in the sub Vi's GPIB address is constant. I have the driver for 2182 but it is not a problem, at least now.
Attachments:
ReadCurrent.vi ‏17 KB
Voltage_limit.vi ‏17 KB

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