Converting Battery Voltage Hex

i am working on a program in visual basic to get the data from my ax1500 controller, and i am sucessful in receiving the string of characters that the controller puts out when it is in rc mode, and i can seperate them into sets of 2 for each hex set, but i dont know how to convert the hex so that it is a decimal for the voltage. the hex that i am getting is 39, but when i convert it with the table in the manual I get a decimal of 57. And when i go into roborun it tells me that i have 12.5 volts on the main batteries. Any help would be much appreciated. - Adam

<P style="MARGIN: 0px">Converting an HEX string into a decimal value is done as follows:
<P style="MARGIN: 0px">
<P style="MARGIN: 0px">DecimalValue = Val("&amp;H" + HexString)