INALIMCO

Hi i am new using jazz oplc i am tryng to program a jz10-11-un20 and it is giving me problema with comunication i am using a MJ20-PRG with MJ20-CB200 cable MJ10-22-CS10 and all of these join to mi computer wit a Logitech USB to serial DB9 converter the problen is the software U90 LADER after i configure all the com parameters tels me cant find com port 1 iven if i change the com port in the computer and the software to any other com port i was wanderinf if the Logitech convertion usb to rs232 is not adecuate to do the job Tanks in advance for your help PD sorry about my english i am a spanish speaking people