Problem with Accessing Serial Port via Mini USB on WM6.1 on HTC Pro Phone

Dear All

Sorry am an ultra noob. Here is the problem.

I have an HTC Touch Pro , I have a serial port controlled device, I have an OTG cable. I have a usb-serial cable

I would like to control this device thru my WM6.1 HTC Touch Pro Phone.

I just need to be able to send and receive RX,TX , no need to supply power.

I have tested the Serial Device on my PC (Win 7) , it works.

QUESTION 1: has anyone open serial port (COM port) using a WM6.1 before ??
QUESTION 2 : Which model phone using WM6.1 can do this.....I dont mind to get that exact phone.
QUESTION 3 : can my HTC Touch Pro do it ??