Communicating error in ethernet to print variable.

Hi!

Thesedays, I am interfacing yokogawa GS200 instrument. and I have a problem communicating with it via ethernet port.

When I communicate with GS200 via GPIB port, simply to give voltage level to the yokogawa GS200, I set gpib connection to the matlab.(I'll not show here the basic gpib setting)

and then I type below

fprintf(obj1, ':SENS:LEV 100E-3')

Then I can see the voltage is set to 100 mV in my yokogawa GS200 instrument.

To set the voltage level with variable I set

V=50E-3 %put voltage level whatever I want to set, in here just to 50 mV as example
fprintf(obj1, ':SENS:LEV %d',V)

Then, it also works and I can see the voltage is set to 50 mV in my yokogawa GS200 instrument.

So, I want to do same procedure using ethernet port.

I set ethernet port setting properly.

I type

fprintf(obj1, ':SENS:LEV 100E-3')

and It works and I can see the voltage is set to 100 mV in my yokogawa GS200 instrument using ethernet port.

But, when I try to input variable voltage as same way as I did with gpib port

V=50E-3 %put voltage level whatever I want to set, in here just to 50 mV as example
fprintf(obj1, ':SENS:LEV %d',V)

it doesn't work. yokogawa GS200 shows error. The yokogawa GS200 doesn't interpret the command properly when I communicate through ethernet.

How should I set command propely to make it happen?