This is the revision B version of the DB9RJ11 module.

DB9RJ11 Module (Revision B)

Table of Contents

• 1. Introduction
• 2. Hardware
  • 2.1 Circuit Schematic
  • 2.2 Printed Circuit Board
• 3. Issues

1. Introduction

The DB9RJ11 module intefaces an RJ11 connector to a DB9 connector. It is meant to used with a WireHost Module.

2. Hardware

The hardware consists of a circuit schematic and a printed circuit board.

2.1 Circuit Schematic

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.

2.2 Printed Circuit Board

The printed circuit board files are listed below:

db9rj11_back.png

The solder side layer.

db9rj11_front.png

The component side layer.

db9rj11_artwork.png

The artwork layer.

db9rj11.gbl

The RS-274X "Gerber" back (solder side) layer.

db9rj11.gtl

The RS-274X "Gerber" top (component side) layer.

db9rj11.gal

The RS-274X "Gerber" artwork layer.

db9rj11.gml

The RS-274X "Gerber" mask layer.

db9rj11.drl

The "Excellon" NC drill file.

db9rj11.tol

The "Excellon" tool rack file.

3. Issues

The following fabrication issues came up:

• J1 does not actually turn off the LED's in all situations. As long as one is on and the another is off, current will flow between them irrespective of J1.