z/VM: CP Commands and Utilities Reference - z/VM - IBM

SET RDEVICE
Authorization
Purpose
Usage Notes
Privilege Class: B
SET RDEVICE
Use SET RDEVICE to add, change, or clear the system’s definition of a set of real
devices.
The following sections describe the syntax of SET RDEVICE commands for clearing
real devices and for adding and changing these real devices:
v Advanced function printers
v Card punches
v Card readers
v Communication controllers
v DASDs
v Graphic display devices
v Impact printers
v Integrated communication adapters
v Special devices
v Tape units
v Unsupported devices
v 3270 displays
v 3800 printers.
1. Once you have defined a device at a certain address, you can replace that
device with another device of a different class. The following are considered to
be discrete device classes:
v DASDs
v Graphic display devices
v Special devices (3088s, CTCAs, 37x5)
v Special switching devices
v Tape drives
v Terminals
v Unit record devices.
2. If you change the type of device for a given device address, the features
previously defined for that device are returned to their defaults. When you
change any feature other than device type for the device at a certain address,
however, the other features remain the same. For example, assume you have
an IBM 3800 Model 1 printer defined at address 0500 and CHARS GF10 and
AFP YES specified and you want to replace it with an impact printer. When you
use the SET RDEVICE TYPE IMPACT_PRINTER command to tell CP the new
printer is in place, CP resets all the other features to their defaults. If you leave
the 3800 printer in place, however, and use SET RDEVICE to specify a flash
overlay (SET RDEVICE ... FLASH flashlib), CP leaves all the other features
unchanged.
3. You must use the VARY command to take a device offline before you can
redefine it.
4. By default, CP issues a sense ID request to gather information about the device
that you are defining or changing. If you prefer to explicitly define or change the
device, you can stop CP from issuing the sense ID request by specifying the
NOTSENSED operand. The only exception is the SET RDEVICE Unsupported
Chapter 2. CP Commands 1333