System Interconnections
part of
In Vitro System Additional Documentation
by aegrumet@alum.mit.edu
System Components
The data acquisition system consists of:
- A voltage-controlled current source stimulator, with monitor amplifiers
to measure the stimulus current and voltage,
- An eight-channel nerve response amplifier, consisting of a pre-amplifier
board located near the retina preparation and a rack-mounted high gain
amplifier,
- A Pentium computer with analog/digital interfaces,
- A four-channel oscilloscope,
- A speaker.
I have drawn a block diagram
to illustrate how these elements relate functionally to one another.
This diagram is taken from
my thesis,
where much more documentation on the experimental system can be found.
Wiring Diagram
Here is a rather large wiring diagram
illustrating signal flow through the system.
Details
DAP Analog Connector
pinout
- D/A Channel 0 (DACOUT 0, A0): Trigger waveform
- --> Analog In Channel 15
- --> D/A 0 on front panel --> Artifact Suppression In --> Artifact suppression Out --> Stimulator On/ff
- D/A Channel 1 (DACOUT 1, A1): Stimulator (Current)
- A/D Channels 0-7 (S0-S7): front-panel --> Amplifiers A-H
- A/D Channel 13 (S13): Monitor 2 (Voltage)
- A/D Channel 14 (S14): Monitor 1 (Current)
- A/D Chennel 15 (S15): Trigger, shorted to D/A Channel 15
DAP Digital Connector
pinout
- Digital Output 12 (DO12): Select Channel, Bit "C" (MSB)
- Digital Output 13 (DO13): Select Channel, Bit "B"
- Digital Output 14 (DO14): Select Channel, Bit "A" (LSB)
- Digital Output 15 (DO15): Advance Counter/Setting for Selected Channel
- Digital Input 6 (DI6): Read Channel Setting Bit "C" (MSB)
- Digital Input 7 (DI7): Read Channel Setting Bit "B"
- Digital Input 8 (DI8): Read Channel Setting Bit "A" (LSB)
aegrumet@alum.mit.edu