StimTracker Interface to Biopac MP35 and MP36

Summary

Cedrus manufactures a StimTracker adapter board that makes it possible to interface with Biopac’s MP35 and MP36 data acquisition and analysis systems using a standard DB25 cable. This document describes the signals that the adapter board makes available to MP35 and MP36.

Please note that the STP100C also has a DB25 connector but it is not compatible with the DB25 connector on the MP35 and MP36. Connecting StimTracker’s MP35 adapter board to the STP100C will not work.

Setting Up Biopac Student Lab (BSL)

Setting up BSL to work with StimTracker is straightforward:

1.

Click on the MP36 (or MP35) menu and choose Set Up Channels….

2.

The “Input channels setup” dialog appears. Click on the Digital tab.

3.

Enable all checkboxes for each of the Acquire, Plot, and Value columns.

4.

Optionally, you can also rename the labels.

Close the “Input channels setup” dialog and click on “Start”.

The Signals

The channel number in the table is as seen in the BSL package. Ground is on DB25 pins 5 and 6. See also the note in Using StimTracker about the rate at which the LEDs flash in StimTracker’s front panel.

StimTracker Signal

Trigger Value

Comments

Event marker bit 1

Microphone

TTL input

Light sensor 1

D1

D3

D5

D7

StimTracker will send output to channel 3 when it detects input on any of the six TTL/digital input lines.

Event marker bit 2

D8

Event marker bit 0

D6

Audio L+R

D4

StimTracker will send output to channel 4 when the volume rises above the preset threshold on either the left audio channel or the right audio channel.

Light sensor 2

D2

Last Revision: December 15, 2008

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