kapil 
hi to all members, i m having arm9 mini 2440 board with WIN-CE i've written a app in vb .net2005 for serial communication using modbus protocol,the problem that i m facing is when i connect my pc n board without connecting serial cable to the board's port then board get connected to pc using active sync s/w and i can deploy my app over it but s soon s i connect serial cable to board the connection between pc and board is lost.and this thing is happening again n again till serial cable is connected.i've checked cable got no isues with that too. if any 1 can suggest any thin that would be a great help. thanks in advance Kapil