Subsystem Verification - IBM 3274 Planning, Setup, And Customizing Manual

Subsystem Verification
1-8
parameters at an attached 3278 or 3279 display station. As a result of this procedure, a
unique configuration table is written on the system diskette. In daily operations the
operator inserts this customized system diskette in the 3274 and presses the on/off switch
to on, or, if this switch is already on, presses the IML button. This action causes the 3274
to execute the diagnostic routines stored on the system diskette. Upon successful
completion of these tests, the 3274 is loaded with the configuration data that was stored
on the system diskette by the customizing procedure. System operation can now begin.
There are various occasions when it will be necessary to customize your system
diskette(s). They are as follows:
• When you initially customize your system diskette (as described above).
• When you wish to duplicate your system diskette. (This new diskette is referred to as a
backup diskette.)
• When you wish to generate a second system diskette to be used for a different
purpose. For example, you may choose to have one system diskette to operate in BSC
mode and another to operate in SDLC/SNA mode.
• When you need to recustomize your system diskette because you have changed your
configuration. This includes adding or removing features such as Encrypt/Decrypt or
terminal adapters.
Detailed procedures for performing these tasks are provided in Chapters 2 through 6.
In general, the person who customizes the system diskette uses a
language
diskette and a
feature
diskette in conjunction with the customizing procedure. The language diskette is
used to customize· the system diskette for languages other than English (U.S.) and
Canada/French (both are EBCDIC), and the ASCII (U.S.)1 character set. The feature
diskette is used to customize the system diskette for all other cluster parameters. The
detailed customizing procedures explain when to insert the required diskettes and direct
the person customizing the 3274 to enter the configuration information into the 3274
through a 3278 or 3279 display station attached to port AO of the 3274.
To simplify the customizing task, it is recommended that the planner compile the
configuration information and supply it to the person responsible for performing the
customizing procedure. Included in Chapter 3 are
descriptio~s
of the parameters to be
entered and instructions for completing the Initial Customizing Procedure Form (Chapter
4). A form should be completed for each 3274 ordered prior to delivery of the unit. In
addition, configuration information should be copied on the Configuration Data card
(shipped with the 3274) and stored in the 3274. (A pocket, located on the inside of the
3274's customer access door, is a convenient place to store this card.)
After customizing is completed, all devices are attached to the 3274, and an initial
microcode load (IML) of the subsystem has been performed, it should be verified that the
control unit can reach all attached devices. This can be done by performing the
Subsystem Verification Procedure (Appendix D). This procedure allows the operator
to:
• Verify the number of Type A and B devices configured.
• Determine whether a device is powered on or off.
• Determine whether a device has been disabled as a result of a device error.
1
The ASCII character- set is available in the U;S. only.