Browse Prior Art Database

Dynamic Control of Static Connections Through a Serial Switch

IP.com Disclosure Number: IPCOM000107442D
Original Publication Date: 1992-Feb-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 3 page(s) / 123K

Publishing Venue

IBM

Related People

Miracle, G: AUTHOR

Abstract

Disclosed is a method for dynamically changing static connections through a serial switch (see the figure) to allow a single serial channel to communicate with multiple serial-to-parallel (S/P) converters and their attached control units. The serial channel establishes a static connection by sending a serial frame through a dynamic connection to the serial switch controller port and breaks its static connection by sending a special continuous sequence of serial characters. The prior method of changing static connections was only via either operator commands or program control.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 51% of the total text.

Dynamic Control of Static Connections Through a Serial Switch

       Disclosed is a method for dynamically changing static
connections through a serial switch (see the figure) to allow a
single serial channel to communicate with multiple serial-to-parallel
(S/P) converters and their attached control units.  The serial
channel establishes a static connection by sending a serial frame
through a dynamic connection to the serial switch controller port and
breaks its static connection by sending a special continuous sequence
of serial characters.  The prior method of changing static
connections was only via either operator commands or program control.

      A static connection through a serial switch fixes from one to
eight control units attached to a single S/P converter for exclusive
usage by a single serial channel. This exclusive usage remains fixed
until this static connection is changed either manually or under
program control.  Manual configuration control is via an operator who
is directly controlling the serial switch.  Program control is via a
serial channel attached to a separate dynamic port which is not part
of any static connection. The serial channel attached to this dynamic
port communicates with the serial switch controller port using serial
frames that request configuration changes.  The following discloses a
method which allows a single serial channel to configure and use all
the control units attached to multiple S/P converters, without
limiting its total number of control units to eight and with a limit
of no more than 256 total unit addresses.

      Configure the serial switch controller to know which dynamic
ports are attached to S/P converters and channels, and which
converters are configured in the same partition with which channel.
A switch partition may contain multiple converters, but only one
channel.  Configure each channel with the dynamic port number(s)
attached to its converter(s).  All ports attached to channels and
converters will be initially dynamic ports.  A channel establishes a
static connection to one of its configured S/P converters by first
sending to the dynamic port of the switch controller a serial frame
containing the port number attached to the desired converter.  This
serial frame establishes a dynamic connection to the switch
controller port.  To honor the static connection request, the switch
controller will send a serial frame response to the channel
indicating its intention to establish the static connection.  This
serial frame will break the dynamic connection betwee...