Parameters

SUPUNIT=

Specifies the address of the SUPUNITS table entry for the device for which a session is needed.

CTAB=

Specifies the address of the compaction table to be used for this data. This parameter is checked only when the writer DSP issues the IATXWOPN macro. If CTAB is coded, ECF cannot be coded.

PDIR=

Specifies the address of a table which has the format of the peripheral data set information record (PDIR). This parameter is checked only when the writer DSP issues the IATXWOPN macro. If PDIR is coded, ECF cannot be coded.

ECF=

Specifies the address of a doubleword containing the address of the ECF to be posted in word 1, and the ECF mask in the low-order byte of word 2. The first three bytes of word 2 must contain zeros. ECF is used only by a reader DSP.

If ECF is not coded, the reader DSP will wait on data arrival only. If ECF is coded, the reader DSP will wait on data or the ECF.

If ECF is coded, CTAB and PDIR cannot be coded.

CONSOLE=

Ignored unless the SUPUNITS table specifies this is a console device. If specified, this parameter indicates inbound or outbound.

ERROR=

This parameter specifies the address to which the macro processing routine returns if an error occurs. When control is passed to the address, register 0 contains a dump code and register 15 contains a return code, unless otherwise specified. The return codes are described below.

If an error occurs and ERROR was not specified, the dynamic support program (DSP) will be ended by using the FAILDSP macro.

NORMAL=

This parameter specifies that after the macro processing routine executes, the issuing program can resume execution at an instruction other than the instruction that immediately follows the macro.