Connector Pinouts

part of In Vitro System Additional Documentation by aegrumet@alum.mit.edu

8-Channel Amplifier

8-channel amplifier chassis rear wall, as viewed from inside the chassis:

C1 Connector - Power
View from inside the amplifier chassis
Pin Function
1COM
2N/C
3+5V
4-5V
5N/C
C2 and C3 Connectors - Preamplifiers
View from inside the amplifier chassis

View facing the mating end of the connector

L-Preamplifier (C2)R-Preamplifier (C3)
Pin   Function
1
2
3
4Amplifier E, Bit A
5Amplifier E, Bit B
6Amplifier E, Bit C
7
8Amplifier F, Bit A
9Amplifier F, Bit B
10Amplifier F, Bit C
11
12Amplifier G, Bit A
13Amplifier G, Bit B
14Amplifier G, Bit C
15
16Amplifier H, Bit A
17Amplifier H, Bit B
18Amplifier H, Bit C
19
20Amplifier E, Preamp Output
21
22Amplifier F, Preamp Output
23
24Amplifier G, Preamp Output
25
26Amplifier H, Preamp Output
Pin   Function
1
2Amplifier D, Preamp Output
3
4Amplifier C, Preamp Output
5
6Amplifier B, Preamp Output
7
8Amplifier A, Preamp Output
9Amplifier D, Bit A
10Amplifier D, Bit B
11
12Amplifier D, Bit C
13Amplifier C, Bit A
14Amplifier C, Bit B
15
16Amplifier C, Bit C
17Amplifier B, Bit A
18Amplifier B, Bit B
19
20Amplifier B, Bit C
21Amplifier A, Bit A
22Amplifier A, Bit B
23
24Amplifier A, Bit C
25
26

Notes: the Bits C(MSB), B, and A set the counter/setting for each amplifier channel. Hence if the voltages on Connector C2 pins 6, 5, and 4 are HIGH, LOW, and LOW (respectively) then Amplifier E is set to 4.

C4 Connector - Computer control of MUX's
View from inside the amplifier chassis

View facing the mating end of the connector

Pin Function
1Select Channel, Bit C (MSB), to DAP Digital Output Bit 12 (DO12)
2Select Channel, Bit B, to DAP Digital Output Bit 13 (DO13)
3Select Channel, Bit A (LSB), to DAP Digital Output Bit 14 (DO14)
4Advance Counter/Setting for Selected Channel, to DAP Digital Output Bit 15 (DO15)
5Read Channel Setting Bit C (MSB), to DAP Digital Input Bit 6 (DI6)
6Read Channel Setting Bit B, to DAP Digital Input Bit 7 (DI7)
7Read Channel Setting Bit A (LSB), to DAP Digital Input Bit 8 (DI8)

Read Channel Setting   Channel Selected
(Bit C|Bit B| BitA)
0|0|0 Channel A
0|0|1 Channel B
0|1|0 Channel C
0|1|1 Channel D
1|0|0 Channel E
1|0|1 Channel F
1|1|0 Channel G
1|1|1 Channel H

Microstar Data Acquisition Processor (DAP)

The system uses a Data Acquisition Processor (DAP) model 3000a/212 from Microstar Laboratories for generating stimulation pulses and recording response waveforms. The DAP has sixteen analog input channels, two analog output channels, and sixteen bits each of digital input and output. The DAP resides inside the computer and has two connectors---one for analog and one for digital. The analog connector is accessible from the back of the computer, but to get to the digital connector you have to open up the computer.

aegrumet@alum.mit.edu