Diagnosing line and terminal problems

The trace records with the following identifier are useful in diagnosing line and terminal problems:

A01

TERMINAL INPUT READY FOR IMS PROCESSING

I TP BUF

Contains input device segment 6 to 36 bytes from the beginning of the buffer. The data is preceded by a 2-byte length and 2 bytes of zeros.

A02

PRIOR TO ISSUING VTAM® I/O REQUEST. (LOGICAL READ)

CLB

For remote 3270:

X'0001'

Special poll (read sense/status)

X'0401'

Read initial (general poll)

X'0082'

Write initial

X'0084'

Write continue

Offset X'0C' contains the address in TP BUF to read into or write from.

I TP BUF

The input TP buffer contains data to be written if this is an output operation. For VTAM nodes, the RPL begins at offset X'08'.

A05

PRIOR TO ISSUING VTAM I/O REQUEST. (LOGICAL WRITE)

CLB

Refer to the information for record A02.

O TP BUF

The output TP buffer contains data to be written if this is an output operation. For VTAM nodes, the RPL begins at offset X'08'.

A07

GENERATE 'UNABLE TO RECEIVE/OUTPUT' MESSAGE

See the preceding D02 or D04 record for the cause.

A09

GENERATE ERROR MESSAGE

See the preceding D02, D04, or D07 record for the cause.

AER2

SHOULD NOT OCCUR ERROR HAS OCCURRED

CLB

Offset X'3E' contains the error message number in hexadecimal. All available control blocks and buffers are logged. This record is produced even if the trace is not set on.

CRTU

OUTPUT USER CREATION EXIT ROUTINE FAILURE

CVCT

VTAM DEVICE SUPPORT TRACE

CLB

Normally offset X'1C' contains the complemented IMS message key of an IMS master terminal message. All available control blocks and buffers are logged. This record is produced even if the trace is not set on.

I TP BUF of O BUF

The VTAM RPL begins at offset X'08'.

CVCV

XRF CLASS 2 TAKEOVER TRACE

This log record is written for XRF class 2 terminals during takeover, even though DC trace is not active on the terminal. This record can be used to diagnose subsequent session failures when used in conjunction with CVCT records.

D02

VTAM HAS POSTED I/O COMPLETE. (LOGICAL WRITE INTERRUPT)

CLB

Offset X'00' =

Post code

• X'40' for VTAM = normal completion

Other key fields are DECFLAGS and DECERRST. For VTAM, key fields are CLBVFLAG and CLBLOST.

O TP BUF

For VTAM nodes, the VTAM RPL begins at offset X'08'.

D04

VTAM HAS POSTED I/O COMPLETE. (LOGICAL READ INTERRUPT)

CLB

Refer to the information for record D02.

IOB

Refer to the information for record D02.

I TP BUF

The input TP buffer contains data read from the terminal if the last operation was a read or poll. For VTAM nodes, the RPL begins at offset X'08'.

D07

DEVICE DEPENDENT INITIALIZATION/TERMINATION

CLB

Refer to information for record D02.

O TP BUF

The VTAM RPL begins at offset X'08'.

HCSW

XRF CLASS 1 TAKEOVER TRACE

This log record is written for XRF class 1 terminals during takeover, even though DC trace is not active on the terminal. This record can be used to diagnose subsequent session failures when used in conjunction with CVCT records.

VTPO

REJECTED POSTING OF ECB