IBM 2074 Installation And Maintenance Information page 33

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If the clients emulator is having problems, suggest they:
v Verify it is TN3270E capable
v Contact the emulator vendor for service
v Try a different 3270 emulator
Note: If the client PC is locking up or hanging, then contact the operating system
vendor to determine the application which is failing. If it is determined that
the emulator they are using is at fault, contact the emulator vendor for
support. If the emulator is IBM's PCOM, then have the customer contact IBM
Software Support, or whoever is the proper contact for PCOM service.
Running a NIP Console or a Printer over TN3270E isn't something vendors
were ever able to test until this offering. The 2074 only sends 3270 data
streams to the emulator. Nothing we send, be it incorrect or LAN corrupted,
should ever cause an emulator to fail or lockup a PC.
If the client emulator locks up with a PROG751 error, the application software may
be sending illegal characters to the client session. The IBM PCOM emulator has a
setting that will eliminate this lockup. We recommend adding the following to the
*.WS configuration file of the clients:
[LT]
UndefinedCode=y
IgnoreWCCStartPrint=y
The second setting will eliminate another problem where the client's local PC printer
may print a single page when the client connects to a VTAM session. If your client
3270 emulator is not IBM PCOMM, you will have to determine what the equivalent
settings are for your emulator and configure them thusly.
There are options to help with remote or problem clients. The options are "/RSP"
and "/RTO=60". These options can appear as global options for all of LAN3274's
addresses (F2, F12), or for a specific address (F2). /RSP means only send one
CCW per TCP/IP packet, and wait for a response. /RTO is a time out timer in
seconds to wait for a response. Also, the zSeries (S/390
have its MIH adjusted to a proper value, so it doesn't time out before /RTO does.
For more information review LAN3274.DOC. The basic principal is as follows:The
2074 has no way of knowing if the client is a) hung, b) unplugged from the LAN, c)
not responding due to a slow LAN. So we implemented the /RTO time out. It tells
the host operating system that the client is gone. The client should notify the 2074
that the emulator is ending by sending the 2074 a "disconnect" message.
Also, the client's PC has to have its TCP/IP enabled in addition to the emulator
sessions configured. For help configuring the emulator, review the class foils used
for training IBM, located in the PRESENT subdirectory on both the 2074 Load CD
and the 2074's C: drive. The file name is CLASS.PDF. The 2074 has Adobe's
ACROBAT reader in the OS/2 SYSTEM folder. Use it to view the file.
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) Operating System must
Chapter 2. Maintenance Information
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