I 2 C Expansion Port; Pod Connectors - ADInstruments PowerLab 2/20 Owner's Manual

Figure A–8
The USB connector.
Figure A–9
The pin assignments for the
2
I C port.
Appendix A — Technical Aspects
Your PowerLab is supplied with a proper high-speed USB cable. If
you need additional USB cables, you should buy high-speed cables
(fully shielded, twisted-pair, and with standard USB connections) for
reliable results.
2
I C Expansion Port
2
The I C port on the back panel of the PowerLab provides expansion
support for ADInstruments front-ends. This port provides both
power and control signals for these front-ends. The I
daisy-chain structure that allows simple connection of additional
front-ends to the system. A PowerLab can have as many front-ends
connected to it as it has appropriate connections. You should not
attempt to run other external devices from the I
for use only with ADInstruments front-ends. Only 50 mA maximum
current can be provided through this bus, so it should not be used for
third-party devices drawing more current.
Front-end power
5
9

Pod Connectors

The pod connectors on Inputs 1 and 2 of the PowerLab 2/20 and
PowerLab 4/20 are 8-pin DIN connectors. Pod connectors allow the
connection of ADInstruments pods — small, low-cost units that
provide alternatives to front-ends for specific tasks, for use with
precalibrated transducers and so on. The Pod connectors on do not
2
I C control signals
1
6
2
C bus has a
2
C port: it is designed
25