CONVERSE (3790 3270-display)
Communicate on a 3790 (3270-display) logical unit.
Description
CONVERSE communicates on a 3790 logical unit.
Options
- CTLCHAR(data-value)
- specifies a 1-byte write control
character (WCC) that controls the CONVERSE command. A COBOL user must
specify a data area containing this character.
If the option is omitted, all modified data tags are reset to zero, and the keyboard is restored.
- DEFRESP
- indicates that a definite response is required when the output operation has been completed.
- ERASE
- specifies that the screen printer
buffer or partition is to be erased and the cursor returned to the
upper left corner of the screen. (This option applies only to the
3270, or 8775, and to the 3604 Keyboard Display.)
The first output operation in any transaction, or in a series of pseudoconversational transactions, should always specify ERASE. For transactions attached to 3270 screens or printers, unless explicitly overridden by the DEFAULT or ALTERNATE option, this also ensures that the correct screen size is selected, as defined for the transaction by the SCRNSIZE option in the RDO PROFILE definition.
- FROM(data-area)
- specifies the data to be written to the terminal or logical unit, or sent to the partner transaction. This option may, when relevant, be omitted if ATTACHID is specified.
- FROMFLENGTH(data-value)
- is a fullword alternative to FROMLENGTH.
- FROMLENGTH(data-value)
- specifies the length, as a halfword binary value, of the data. For a description of a safe upper limit, see LENGTH options in CICS commands.
- INTO(data-area)
- specifies the receiving field for the data read from the terminal or logical unit, or the application target data area into which data is to be received from the application program connected to the other end of the current conversation.
- MAXFLENGTH(data-value)
- is a fullword alternative to MAXLENGTH.
- MAXLENGTH(data-value)
- specifies the maximum amount
(halfword binary value) of data that CICS® is
to recover in response to a CONVERSE (default) command. If INTO is
specified, MAXLENGTH overrides the use of TOLENGTH as an input to CICS. If SET is specified, MAXLENGTH
provides a way for the program to limit the amount of data it receives
at one time.
If the value specified is less than zero, zero is assumed.
If the length of data exceeds the value specified and the NOTRUNCATE option is not present, the data is truncated to that value and the LENGERR condition occurs. The data area specified in the TOLENGTH option is set to the original length of data.
If the length of data exceeds the value specified and the NOTRUNCATE option is present, CICS retains the remaining data and uses it to satisfy subsequent RECEIVE commands. The data area specified in the TOLENGTH option is set to the length of data returned.
If no argument is coded for MAXLENGTH, CICS defaults to TOLENGTH.
- NOTRUNCATE
- specifies that, when the data available exceeds the length requested, the remaining data is not to be discarded but is to be retained for retrieval by subsequent RECEIVE commands.
- SET(ptr-ref)
- specifies the pointer reference
to be set to the address of the data read from the terminal. pointer
reference, unless changed by other commands or statements, is valid
until the next CONVERSE (default) command or the end of task.
If DATALOCATION(ANY) is associated with the application program, the address of the data can be above or below the 16MB line.
If DATALOCATION(BELOW) is associated with the application program, and the data resides above the 16MB line, the data is copied below the 16MB line, and the address of this copy is returned.
If TASKDATAKEY(USER) is specified for the running task, and storage protection is active, the data returned is in a user-key. If TASKDATAKEY(CICS) is specified and storage protection is active, the data returned is in a CICS-key.
- TOFLENGTH(data-area)
- is a fullword alternative to TOLENGTH.
- TOLENGTH(data-area)
- specifies the length (halfword
binary value) of the data to be received. If you specify INTO, but
omit MAXLENGTH, “data-area” specifies the maximum length that the
program accepts. If the value is less than zero, zero is assumed.
If the length of the data exceeds the value specified, but NOTRUNCATE is omitted, the data is truncated to that value, and the LENGERR condition occurs. When the data is received, the data area is set to the length of the data.
For a description of a safe upper limit, see LENGTH options in CICS commands.
Conditions
- 22 LENGERR
- occurs in any of the following
situations:
- Data received is discarded by CICS because its length exceeds the maximum that the program accepts (see TOLENGTH and MAXLENGTH options), and the NOTRUNCATE option is not specified.
- An out-of-range value is supplied in one of the options, FROMLENGTH, FROMFLENGTH, MAXLENGTH, MAXFLENGTH, TOLENGTH, or TOFLENGTH.
Default action: terminate the task abnormally.
- 81 TERMERR
- occurs for a terminal or session-related
error. Any action on that conversation other than a FREE causes an
ATCV abend.
A CANCEL TASK request by a user node error program (NEP) may cause this condition if the task has an outstanding terminal control request active when the node abnormal condition program handles the session error.
Default action: terminate the task abnormally with abend code ATNI.