Owner’s Guide
10
Multiple Front-ends
Multiple separate front-ends can be connected up to a PowerLab. The initial front-
end should be connected with the I
2
C cable as in Figure 2–1. The remainder are daisy-
chained via I
2
C cables, connecting the I
2
C output of the last connected front-end to the
I
2
C input of the front-end to be added (Figure 2–2).
Second I
2
C cable connected to
Front-end I
2
C output
First I
2
C cable connected
to PowerLab I
2
C output
The number of normal front-ends that can be connected to a PowerLab depends on the
number of analog input channels on the PowerLab. Each BNC cable from a front-end
should be connected to one analog input channel on the PowerLab, for example, Input
1 on a /30 or /35 series PowerLab.
Note:
Only one Stimulator front-end such as a Stimulus Isolator can be connected to
the positive output of the PowerLab.
Special Cases
Some front-ends have their own specific connection requirements. Please refer to the
individual chapter for each front-end in this guide.
Connecting Stimulator Front-Ends
The PowerLab analog outputs provide a variable, computer-controlled voltage output
that can be used with LabChart, LabTutor, LabStation or Lt to connect a Stimulator
front-end, or to stimulate directly, or to control a peripheral device. A voltage output is
generated by the PowerLab and delivered via the BNC output sockets, giving positive,
negative, diff erential, or independent stimuli, depending on the PowerLab used and the
soft ware settings.
The /20, /25, and /26 series PowerLabs have analog outputs l and –. In contrast,
the SP, ST, /30 and /35 series PowerLabs have the outputs labeled Output 1 and Output
2.
Figure 2–2
Connecting
multiple front-
ends to the
PowerLab (two
single front-
ends shown for
simplicity)
Second
Front-end
I
2
C input
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