Say you have a 10-year bond paying coupon twice a year with a coupon rate 10%, nominal principle (par value) of 100,000 and a yield to maturity of 8%. You can come up with the present value in the following precedure.
1.Calculate the semiannual coupon payment yourself : 100,000*10%/2=5,000
2.Key in the parameters in BA2 Plus: 20 N 4 I/Y 5000 PMT 100000 FV
3.Press: CPT PV
4.You got what you want