Browse Prior Art Database

One-Wire Two-Way Communications for Monitors

IP.com Disclosure Number: IPCOM000113610D
Original Publication Date: 1994-Sep-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 4 page(s) / 99K

Publishing Venue

IBM

Related People

Eagle, DJ: AUTHOR [+3]

Abstract

Disclosed is a method whereby a micro-controlled monitor can be set up in the plant or field without removing the rear covers, by means of a PC. Benefits for manufacturing are: fully automated set-up procedure and elimination of one operator from the process. The embodiment described relates to IBM product 6324 and others.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

One-Wire Two-Way Communications for Monitors

      Disclosed is a method whereby a micro-controlled monitor can be
set up in the plant or field without removing the rear covers, by
means of a PC.  Benefits for manufacturing are: fully automated
set-up procedure and elimination of one operator from the process.
The embodiment described relates to IBM product 6324 and others.

      The communication path chosen was the test line, which already
exists in the interface cable between the monitor and system unit.
The original function of this line is to check whether or not the
monitor is connected and activate the test raster if required.  This
function is still retained by structuring the software in the
microcontroller such that the accessing of the communication code is
interupt-driven whilst the test raster function is software polled.
Features of the solution are as follows:
  o  One way or two way communications on one wire.
  o  RS232 based protocol.
  o  Test line still retains original function.
  o  Functions offered in comms mode are determined by the microcode,
     ie fully flexible.
  o  Communications mode is accessable via the front panel keypad
(for
     manufacturing box test and CEs) or by grounding the external
     interupt pin on the micro (for manufacturing card test).
  o  Communication can be to the serial RS232 port or the parallel
     port.  This is determined by the software used in the PC.  For
     the 6324/6325 and 9524/9525 products the serial port was chosen.
  o  Communication adapter is used to break out the test line from
the
     interface cable to the comms port, Fig. 1.

      To enable easy use of the serial port on the PC the comms
protocol is based on the RS232 serial protocol.  There is no
automatic control of communication for the micro, so the protocol is
microcode controlled.  Each packet of information contains a start
bit, the data and stop bit.  The micro is capable of baud rates up to
19.2K baud, this Figure being determined by the microprocessor clock
speed...