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A Reset Mechanism for the IBM Dials/LPFKs Connected to a Serial Port

IP.com Disclosure Number: IPCOM000123735D
Original Publication Date: 1999-Apr-01
Included in the Prior Art Database: 2005-Apr-05
Document File: 1 page(s) / 52K

Publishing Venue

IBM

Related People

Cabezas, RG: AUTHOR [+3]

Abstract

Because of the way the cabling system for the serial (Asynchronous RS-232) port adaptation is designed, the Dials/LPFKs under special circumstances may not reset, as follows:

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 74% of the total text.

A Reset Mechanism for the IBM Dials/LPFKs Connected to a Serial Port

   Because of the way the cabling system for the serial
(Asynchronous RS-232) port adaptation is designed, the Dials/LPFKs
under special circumstances may not reset, as follows:

   If while the host system and the host system link to the
Dials/LPFKs are up, power is momentarily interrupted at the AC
adapter (less than 5 milliseconds) and/or the host's power is
interrupted, the user may need to reset the Dials/LPFKs.  However,
if the power interruption is from the AC plug at the DB-25 (RS- 232)
connector for longer that 5 milliseconds, the Dials/LPFKs may reset
properly and the user specific condition requiring the reset will be
cleared.  If the device did not reset properly, the user may unplug
and replug the AC adaptor triggering the reset of the Dials/LPFKs.
However access to the AC adapter or the D-25 connector is often
difficult or even impossible, so the user may consider resetting the
Dials/LPFKs by unplugging and replugging the 8-pin DIN connector
located at the Dials/LPFKs device.  Since this type of reset does not
always work the first time, it may result in the user
unplugging/replugging the device more times, eventually
deteriorating the device's connector.

   This invention consists of simply adding a normally closed,
temporary two pole, push button switch (see Figure 1) which will
interrupt the 5 volt DC power and the DC return line to the
Dials/LPFKs.  This will provide the user with...