Delay Value; Transmit/Receive - M-Audio Portman 4x4 Manual

c.) The PORTMAN is defective. This is extremely rare as the
PORTMAN units are tested rigorously at the factory before
shipping. If you think this is the case, please contact MIDI-
MAN Technical Support.

Delay Value

Due to the lack of standardization among different computer
manufacturer's designs, some parallel ports are slower than oth-
ers. Because the PORTMAN operates at high data rates, some
computer's parallel ports are slightly slower than the PORTMAN.
This may be compensated for by increasing the Delay Pulse set-
ting in the diagnostic software to account for your particular par-
allel port.
Most of the time the Delay Pulse should both be set to 0. If you
find that your computer is testing erratically on the Internal
Buffers test and/or Transmit/Receive test, you should boost the
Delay Pulse value ever so slightly. Changing the Delay Pulse will
not adversely affect your MIDI performance because even with a
huge Delay Pulse setting, the computer-to-PORTMAN speed is
much faster than MIDI.
Printer Port Hardware Modes
Most computers' parallel printer ports operate in one or more of
the following modes: Compatible, Bi-directional, EPP, and ECP.
The mode is usually manually set in the CMOS setup of the com-
puter (please see your computer's user guide for more informa-
tion). While Compatible mode works with almost all printer
ports, it is also the lowest performance. If available, choose ECP
or Bi-directional first. Then when running the diagnostic software
(or drivers), set H/W Mode to match the printer port mode
you've selected in your CMOS setup. If the higher performance
settings do not work with your computer, back off to Compatible
Mode, which is adequate for MIDI data rates.

3. Transmit/Receive

If your PORTMAN fails this test, it usually indicates a bad MIDI
connection. It could also be an indication of a specific communi-
cation problem.
If this part of the test fails reporting:
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