Solution:

RS232 Serial connections have two distinct orientations. One is DTE, Data Terminal Equipment, pinned out like a PC Com port. The other is DCE, Data Communications Equipment, Pinned out like a Modem.These two orientations are opposite of each other, in that the same pins that are outputs on one type are inputs on the other type. So pin 3 is TX, and is an Output on a DTE device, it is also TX, but is an input on a DCE device.Same is true for RTS, and DTR which are Outputs on a DTE device, and inputs on a DCE device.The reverse is also true. The Outputs on a DCE device are RX, CTS, and DSR, and these are inputs on a DTE device. See the White Paper below for more details. http://www.bb-elec.com/Learning-Center/All-White-Papers/White-Papers-Category1/FAQ-RS-232-Connections-That-Work.aspx