Use the AFHOUNTM macro to specify a single unit, or group of units, that is to be associated with a set of DCB default values. Use the AFHOUNTM macro in conjunction with the AFHODCBM macro.

unitno

The unit number, or the first in a series of consecutive unit numbers, for which the set of default DCB characteristics referenced by the DCBSET parameter is to be applied. If unitno is the number of the error message unit (or if the error message unit is included in the range covered by qty, following), the specification is ignored for the error message unit.

qty

The number of consecutive unit numbers, beginning with unitno, for which the set of default DCB characteristics referenced by the DCBSET parameter is to be applied.

RDRUNIT

Indicates that the set of default DCB characteristics referenced by the DCBSET parameter is to be applied to the standard input unit. The standard input unit is the unit to which a READ statement applies when the unit identifier is given as *. The number of the standard input unit is the value given by the RDRUNIT runtime option or its default.

Even though there may also be an AFHOUNTM macro instruction that refers to the standard input unit by its unit number (that is, with the unitno form of specification), the AFHOUNTM with the RDRUNIT parameter takes precedence and applies to the standard input unit.

If there is no AFHOUNTM macro instruction with a RDRUNIT parameter, then the default DCB characteristics for the standard input unit are those referenced by an AFHOUNTM macro instruction that refers to this unit with the unitno form of specification.

PRTUNIT

Indicates that the set of default DCB characteristics referenced by the DCBSET parameter is to be applied to the print unit.

The print unit is one of the standard output units and is the unit to which either a WRITE statement with a unit identifier of * or a PRINT statement applies. The number of the print unit is the value given by the PRTUNIT runtime option or its default if the number of the print unit is different than the number of the error message unit.

The error message unit the unit to which output such as error messages and dumps from services such as CDUMP and SDUMP is directed. The number of the error message unit is the value given by the ERRUNIT runtime option or its default.

The punch unit is one of the standard output units and is the unit to which a PUNCH statement applies. The number of the punch unit is the value given by the PUNUNIT runtime option or its default.

Even though there may also be an AFHOUNTM macro instruction that refers to the print unit by its unit number (that is, with the unitno form of specification), the AFHOUNTM with the PRTUNIT parameter takes precedence and applies to the print unit.

If there is no AFHOUNTM macro instruction with a PRTUNIT parameter and if the print unit and the error message units are different units, then the default DCB characteristics for the print unit are those referenced by an AFHOUNTM macro instruction that refers to this unit with the unitno form of specification.

PUNUNIT

Indicates that the set of default DCB characteristics referenced by the DCBSET parameter is to be applied to the punch unit. The punch unit is one of the standard output units and is the unit to which a PUNCH statement applies. The number of the punch unit is the value given by the PUNUNIT runtime option or its default.

Even though there may also be an AFHOUNTM macro instruction that refers to the punch unit by its unit number (that is, with the unitno form of specification), the AFHOUNTM with the PUNUNIT parameter takes precedence and applies to the punch unit.

If there is no AFHOUNTM macro instruction with a PUNUNIT parameter, then the default DCB characteristics for the punch unit are those referenced by a AFHOUNTM macro instruction that refers to this unit with the unitno form of specification.

DCBSET=label

The identifier of the DCB attributes to associate with this unit, set of units, or standard I/O unit. This is the name given in the associated AFHODCBM macro instruction.