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Processing Host Directives During Communications Suspensions

IP.com Disclosure Number: IPCOM000042690D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Hayes, RL: AUTHOR [+4]

Abstract

This article describes a technique for preventing the cessation of communications between a printer and host during situations where operator intervention is required (IR). In a systems network architecture (SNA) environment a printer with limited buffering capability suppresses the processing of commands from the host during conditions requiring operator intervention, such as open covers, ribbon depletion and stop button depressed. Commands are not processed lest the host start a new session prior to the termination of the previous session. The host continues to wait for a response which is sent only if the IR condition is cleared. The host has no facility for terminating the session; hence, the entire system hangs up.

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Processing Host Directives During Communications Suspensions

This article describes a technique for preventing the cessation of communications between a printer and host during situations where operator intervention is required (IR). In a systems network architecture (SNA) environment a printer with limited buffering capability suppresses the processing of commands from the host during conditions requiring operator intervention, such as open covers, ribbon depletion and stop button depressed. Commands are not processed lest the host start a new session prior to the termination of the previous session. The host continues to wait for a response which is sent only if the IR condition is cleared. The host has no facility for terminating the session; hence, the entire system hangs up. The present technique enables the system to recover by enabling the support of two concurrent sessions which permits the printer to respond to the new session as well as terminate the previous one. Within the bounds of SNA, without requiring software modifications in the host, the present technique manages the buffers for responding to the host and signaling the operator. When an IR condition exists, a flag is set to indicate the start of a ten-minute timeout. If a host directive to abort the session is received, an indicator is set to initiate the play-out of data in the printer buffers. If play-out completion is prevented by a persistent IR condition, buffer data from the previous sess...