Firat,

First of all try to troubleshoot what's happening by connecting your PC directly to the meter, sending the quiery sequence and observing the response. If you get nulls you'll know the meter is not responding to the quiery. If you get the expected response, connect the PIC to the PC and see if it's sending the quiery string correctly... I guess I didn't help much but this way you'll be sure your hardware is working properly and that's a start...

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Sincerest regards,

YZ7REA Vladimir M Skrbic
4N7ATV Repeater Administrator
YU7GHZ Radio Club President