ADInstruments PowerLab/4SP Owner's Manual page 18

computer remains on (this is not the case with SCSI). The application
program (Chart or Scope) should not be on while this occurs, though.
Please read the details on USB in Chapter 2 of this guide before
connecting your PowerLab to your computer using USB.
The SCSI Port
The PowerLab can connect to your computer using a SCSI port,
which provides an alternative to the USB connection. (SCSI is an
acronym for small computer system interface, and is pronounced
'scuzzy' — which shows that engineers have no taste in acronyms).
SCSI provides fast data transfer, but requires that specific rules be
followed in order for it to work correctly: it is the most complex
aspect of setting up a PowerLab system. Please read the details on
SCSI in Chapter 2 of this guide before connecting your PowerLab to
your computer using SCSI.
Each PowerLab has a single 25-pin connector for connecting SCSI
cables, so it has to be used at the end of a SCSI chain. It is terminated
internally, but the termination can be switched on and off using the
SCSI Termination switch beside the SCSI connector (it should be on).
The SCSI ID Switch
The SCSI ID switch is there if you need to change the SCSI ID number
of your PowerLab. The PowerLab is factory-set to an identification
number of 4. The SCSI ID can be changed simply by pressing the
control buttons while the PowerLab is turned off. The new ID takes
effect when the PowerLab starts up again. Only some numbers are
valid: they depend on the type of computer, whether it has built-in
SCSI or a SCSI card, and the number of built-in and peripheral SCSI
devices in the SCSI chain. This is discussed in the next chapter.
2
I C Output
2
The I C output is a special port designed to connect to front-ends
made by ADInstruments. It supplies power and communications. A
PowerLab can have as many front-ends connected to it as it has
analog inputs, roughly speaking. Note. You should not attempt to run
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other external devices from the I C port: it is designed for use only
with ADInstruments front-ends. Only 50 mA maximum current can
10 PowerLab Owner's Guide