M-AUDIO Biport 2x4s - Manual (Page 7)

Back Panel
10. Power Connector - Accepts power from the 9 Volt DC 500 mA power
supply included with your BiPort 2x4s. If you ever need to replace
this power supply, make sure that it will supply at least 500 mA and
has the center pin positive.
11. Host In - Connects to the serial port of the host computer. For the
PC, it connects to a standard serial (COM) port; for the Mac, it con-
nects to the serial or printer port.
12. Mac Thru - Connects to a modem or printer that would normally be
connected to the serial or printer port of your Macintosh.
13. SMPTE In - Receives SMPTE time code from a tape deck or other
SMPTE source.
14. SMPTE Out - Outputs SMPTE time code to a tape deck or other
SMPTE device.
15. MIDI In-B Connector - For MIDI Input channel B, the second MIDI
input of two.
16. MIDI Outs B, C, and D - For MIDI Output channels B, C, and D (2nd,
3rd and 4th outputs of 4).
Theory of Operation
The BiPort 2x4s may act as a stand-alone SMPTE reader/writer/regener-
ator, or MIDI/SMPTE Interface to a host computer. When first powered
up, the BiPort 2x4s will assume the Stand-Alone mode. In order to enter
MIDI Interface mode, the BiPort 2x4s must be connected to either a Mac
or PC host; the host computer drivers will contact the BiPort 2x4s and
configure it for MIDI Interface mode. When the host is done using the
BiPort 2x4s in Interface Mode, you may command the BiPort 2x4s back
to Stand-Alone mode by exiting all MIDI applications.
Stand-Alone Mode
When first powered up, the BiPort will assume Stand-Alone mode. In
this mode, the BiPort operates in a similar fashion to the Midiman
Syncman
TM and other dedicated sync devices. It is also the mode in
which Mac Thru should be selected if desired. In Stand-Alone mode, the
9VDC
SMPTE Host
In
Mac
Thru Out In
Out-D Out-C Out-B In-B
10 11 12 13 14 15
16
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