Chapter 2. Introduction To Customizing - IBM 3270 Manual

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Chapter 2. Introduction to Customizing
Once installation of your 3274 Control Unit is completed as shown in the
appropriate "Setup Instructions" and the device cables are connected, you
are ready to configure your system of displays and printers. The 327 4
Control Unit permits you; the user, to specify the configuration under
which your 327 4 operates; that is, you customize your 327
4
subsystem. The
configuration information is stored on a diskette mounted inside the 3274
and enables the- 3274 to control all the terminals attached to it. This
diskette, delivered with the 3274, also contains microcode to direct control
unit functions and perform diagnostic routines to test the 3274 prior to
operation. But before this diskette can function in your system, you must
customize it by writing your configuration information on it.
Briefly, you perform customizing by typing in the system parameters at a
3178, 3179, 3180, 3278, or a 3279 attached to port AO of the 3274. If a 3179 is
used, it must be operating in 3279-emulation mode. If a 3180 is used, it must
be operating in 3278-emulation mode. As a result of this procedure, a
unique configuration table is written on the diskette. If 3290 Information
Panels are being used with the 3274, the configuration table is written onto
a load diskette. If no 3290s are being used, the configuration table is
written onto a system diskette. In daily operations, the operator inserts this
customized diskette in the 3274 and presses the on/off switch to the on
position, or, if this switch is already on, presses the IML pushbutton. This
action causes the 3274 to execute the diagnostic routines stored on the
diskette. Upon successful completion of these tests, the 3274 is loaded with
the configuration data that was stored on the diskette by the customizing
procedure. System operation can now begin.
There are various occasions when it will be necessary to customize your
system or load diskette(s ):
• When you initially customize your diskette (as described above).
• When you wish to duplicate your diskette. (This new diskette is
referred to as a backup diskette.)
• When you wish to generate a second diskette to be used for a different
purpose; for example, you may choose to have one diskette to operate in
BSC mode and another to operate in SDLC/SNA mode.
• When you need to recustomize your diskette because you have changed
your configuration. 'rhis includes adding or removing features such as
Encrypt/Decrypt or terminal adapters.
Chapter 2. Introduction to Customizing
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