This section contains information about the node error program (NEP)
of CICS® Transaction Server for z/OS®, Version 3 Release 1. Node error programs, not terminal error programs, must be used
for terminals and logical units supported via the ACF/VTAM interface.
The section is divided into the following sections:
- Background to CICS-VTAM error handling is an overview. If you are not familiar with the
node error program, you should read this section. If you are familiar with
NEPs, you may be able to go straight to the detailed information in the following
sections, and look at the subjects that particularly interest you.
- When an abnormal condition occurs describes the CICS components that are invoked when an abnormal
condition is detected from a VTAM® logical unit.
- The sample node error program describes the CICS-supplied sample NEP.
- Writing your own node error program discusses the factors you need to consider when
writing your own node error program.
- Using the node error program with XRF or persistent sessions.
Notes:
- Like the terminal error program for non-VTAM devices, the node error program
for VTAM-attached terminals is available in three forms:
- The default node error program
- The CICS-supplied sample node error program
- User-written versions.
All three types are discussed in the following sections.
- In this section, "VTAM 3270" refers to a non-SNA 3270 connected
through VTAM, and "3270 compatibility mode" refers to an SNA 3270 connected
through VTAM.
- If you code an EXEC CICS HANDLE CONDITION TERMERR command in your
application program, it is sometimes possible for the
application program to handle exceptional cases, rather than using a node
error program. The ‘TERMERR’ condition is driven if the node abnormal
condition program (DFHZNAC) actions an ABTASK
(‘ATNI’ abend). Note that ‘TERMERR’ is application-related,
and is not an alternative to the node error program, which must be used for
session-related problems. Dealing with errors in the application program is
particularly useful in an intersystem communication (ISC) environment. For
further information, refer to the CICS Intercommunication Guide.
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