I have acquired a copy of the Motorola HT600 programming software. I have a rib box, and all the other hardware necessary to program this model. However, I am having difficulty establishing a connection between the RIB box and my computer. Every time I do attempt to read or send any data to or from the radio, it displays "ERROR 003". I use a USB adaptor to connect the unit to my laptop. Does anyone have any suggestions or know what this error code means?