Steven Rightnar wrote:

> Hello all:
>  I am having a problem with a receiving on the serial port (transmitting is
> fine). I have a visual C++ program that will send and receive over the
> serial port and I have a box (with unknown contents at the other end which
> controls dc motors). So to make these motor go to a position you send a
> ASCII char like p. there are a series of characters that do different
> things. So if I send the @ char it is suppose to return the current
> coordinates. When I send @ I get something back ( symbols) but it is not the
> numbers. The paperwork that came with this box states that if you send   p
> it returns the coordinates in 0.1mm units and the values are two bytes
> binary form. This is where I am uneducated ...it seems that since my program
> is not seeing the data the right way. Does anybody have any knowledge on
> this or can tell me of a resource ( I have been through most VC++ books).Any
> help would be greatly appreciated.

I would guess you need to treat the characters as binary bytes...
(Like it says)

So 2 bytes of 8 bits each gets you values up to 65,535.
Convert the characters into binary bytes, align them and decode them to decimal.

MS byte * 256 + LS byte.

>
>
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