Envision Peripherals NV3128 - Manual (Page 42)

NV3128 RS-422A Machine-Control Routing Switch 2-18
2.4 ADDING A REDUNDANT CONTROLLER
A second Universal Control/Command Interpreter can be specially
ordered and installed for increased system reliability. If you have the
Universal Control card, you must also have the Universal Control
frame in order to install a redundant control card. Contact Technical
Support to verify that your frame can accept a redundant controller.
To install:
1. Remove the existing Universal Control/Command Interpreter from
the frame.
2. Replace the firmware PROMS on the existing module. In some
cases, new firmware supplied on floppy disks or sent to you by email
can be downloaded into the PROMs using UniDiag instead of replacing
the PROMs.
3. Plug both existing and new redundant control cards into the frame.
Note that Universal Control and Command Interpreter modules cannot
be interchanged under all applications.
2.5 IMPLEMENTING HOT CHANGEOVER (OBSOLETE)
Relay terminals on the rear panel of the NV3128 provide control of the
NV3128 should a hot changeover system be required. Call NVision
Technical Support as listed in Chapter 5 of this manual for instructions
in implementing this feature. This feature is available only for obsolete
systems and not for newer systems using the Universal Control card.