This is the revision B version of the DB9RJ11 module.
The DB9RJ11 module intefaces an "RJ11" connector to a "DB9" connector. It is meant to used with a WireHost Module.
Strictly speaking, the "RJ11" connector is a 4P4C connector. Also, strictly speaking the DB9 connector should be called a DE9 connector. Do not go into your local computer store and ask for a DE9 cable, they will not know what you are talking about; ask for a DB9 cable instead. Likewise, if you ask for a "4P4C" cable, you will get strange looks. Ask for a coiled handset cable instead. I was thinking about renaming this module, but decided that DB9RJ11 was closer in spirit than DE9_4P4C, so left the name alone.
The hardware consists of a circuit schematic and a printed circuit board.
The schematic for the DB9RJ11 module is shown below:
This board is designed to eventually support the Parallax product line. Besides the required three lines T×D, R×D, and Ground, the DTR signal is on the line as well. The Parallax products use the DTR line to reset the the various Basic Stamp processors. RTS is fed back to CTS just in case the host processor has hardware flow control turned on.
The parts list kept in a separate file -- db9rj11.ptl.
The printed circuit board files are listed below:
Any fabrications issues that come up will be listed here.