Utilizing the command prompt

I have a question about the command prompt in librecad, I am using inches.  Lets say, for instance, that I am attempting to place a 4" diameter circle at the 2" x 2" point, I choose the circle and the command box displays "specify center" I then input the center that I want, "2 2" and press enter.  When I do this, the command is displayed in the command history but the "specify center" command is still displayed and the center point of the circle has not been placed at the 2 x 2 point in the drawing.  Am I inputting the center point in the wrong syntax?

I figured it out.  Input the desired position in the #, # format.  It was a syntax error on my part. I am just used to inputting the dimensions without the comma.  Thanks anyway.