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PROTOCOL CONVERTER MODEL A/S-4
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2. Modem connected to host but LU inactive; if the LU is inactive the A/S-4 will display
“WAITING FOR LU TO COME ACTIVE”. The LU should come active after a few seconds
of this message appearing on the VDU. If the LU does not come active, then one of the
following problems may exist:
A. Host is not polling PU (Physical Unit) Solution: Have a network operator activate
the PU and maybe the line also.
B. PU address (or station address) is incorrect Solution: Return to A/S-4 menus and
change PU address.
C. LU address is incorrect Solution: Return to A/S-4 menus and change LU address.
After the LU comes Active, the A/S-4 will proceed to the following state. Refer to Section 13.0 on
Trouble Shooting if the LU will not activate for more information.
NOTE
In states 1 and 2 typing any key will return A/S-4 to it’s Main Menu
3. Application running:
Interactive - The A/S-4 will refresh the VDU’s screen with the last screen received from the
host (which could be blank). Operation will then function as a 3278 CRT.
Batch - The A/S-4 will display the status of the LU on the status line but no previous data from
the system will be displayed on the VDU. Operation will then function as a 3770 work station.