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Docs: National Instruments PCI-6071E DAQ Card
The ERPSS Acquisition program requires a National Instruments PCI-6071E DAQ Card for operation. This card, along with the NI SCB-100 shielded connector box, is the link between the EEG amplifiers and the Acquisition program itself. Each PCI-6071E device is capable of gathering up to 64 channels of EEG data, with 12-bit resolution for each channel, at data rates of up to 1.25M samples/second. This is more than sufficient to allow 64 channel recordings at 1 msec resolution.
The NI PCI-6071E card is shown below:
This PCI card must be installed in the Acquisition PC in order to collect EEG
data. Each card is capable of 64 channel recordings, but any number of channels
(e.g. 1-64) and/or combination of channels can be used at any time. The card is
connected to the amplifiers through a connector box (SCB-100). This box contains
a number of screw-terminals that allow leads from the amplifier to be connected
to channels on the card, thereby delivering the analog voltage signals to the
PCI card, and from there they are sampled, buffered, and served up to the Acquisition
program as needed.
The PCI-6071e accepts both analog and digital inputs, however in our setup the digital inputs are not currently being used.
Analog signals (e.g. EEG) are input to the PCI-6071e via four DB25S connectors on the SCB-100 connector box, each of which connects 16 channels of data. The pinouts and channels for each of these connectors are shown in Appendix 2. Each analog input channel has an input impedance of 100 Gohms to analog ground; pull-downs are employed so that unused inputs are essentially at analog ground and need not be connected. Note that although analog ground appears on each analog input connector, these pins are internally connected and must be attached to devices having a common ground potential. The input signal range (maximum) is from -5 volts to +5 volts with respect to analog ground, and should not exceed either limit by more than a couple volts. A 12 bit, 2's complement A/D conversion is performed on the analog data. These 12 bit samples are sign extended to 16 bit values yielding digital representation from -2048 (F800 hex) to 2047 (07FF hex) for input voltages of -5 to 5 volts.
One 8 bit digital input/output port is available on the PCI-6071e. For inputs, this port relies on polling to detect new data, which didn't fit the needs of our Acquisition program due to timing constraints. For this reason, digital inputs are handled by a separate I/O card, the PCI-6533, which supports change detection, interrupts, and input buffering. Therefore, the digital input ports on the PCI-6071e are unused by Acquisition.
Analog Input Device (National Instruments PCI-6071e):
Schematic of PCI-6071e connections:
VER Lab 64-channel amplifier
Connections to the PCI-6071E card A/D system are made in four groups of 16 channels through DB25S connectors (marked channels 0-15, 16-31, 32-47, 48-63) on the SCB-100 connector box. Signal levels should be kept to ±5 volts, which is the full scale range of the A/D converter as configured for the PCI-6071E. Coding of the digital values for each channel is 12 bit, 2's complement binary, with -5 volts corresponding to F800 (hex), and +5 to 07FF (hex). With an input of 0.0 volts, the output is close to 0 (hex).
Analog Input Connector Pin Assignments
CHAN 0 - 15 CHAN 16 - 31 CHAN 32 - 47 CHAN 48 - 63
DB25S Input DB25S Input DB25S Input DB25S Input
Pin Chan. Pin Chan. Pin Chan. Pin Chan.
-------------------------------------------------------------------------
1 0 1 16 1 32 1 48
2 1 2 17 2 33 2 49
3 2 3 18 3 34 3 50
4 3 4 19 4 35 4 51
5 4 5 20 5 36 5 52
6 5 6 21 6 37 6 53
7 6 7 22 7 38 7 54
8 7 8 23 8 39 8 55
9 - 9 - 9 - 9 -
10 - 10 - 10 - 10 -
11 - 11 - 11 - 11 -
12 - 12 - 12 - 12 -
13 - 13 - 13 - 13 -
14 8 14 24 14 40 14 56
15 9 15 25 15 41 15 57
16 10 16 26 16 42 16 58
17 11 17 27 17 43 17 59
18 12 18 28 18 44 18 60
19 13 19 29 19 45 19 61
20 14 20 30 20 46 20 62
21 15 21 31 21 47 21 63
22 - 22 - 22 - 22 -
23 - 23 - 23 - 23 -
24 AG 24 AG 24 AG 24 AG
25 AG 25 AG 25 AG 25 AG
NOTE:
- denotes no connection
AG denotes analog ground
Analog Input Connector Pin Assignments - AER Lab 62 Chans
CHAN 0 - 15 CHAN 16 - 31 CHAN 32 - 47 CHAN 48 - 63
DB25S Input DB25S Input DB25S Input DB25S Input
Pin Chan. Pin Chan. Pin Chan. Pin Chan.
-------------------------------------------------------------------------
1 HEOG 1 PO7 1 CP5 1 FC5
2 VEOG 2 P7 2 T7 2 F7
3 SI3 3 P5 3 C5 3 F3
4 SI4 4 P3 4 C3 4 F4
5 I6 5 P1 5 C1 5 Fz
6 I4 6 Pz 6 Cz 6 FP1
7 Iz 7 P2 7 C2 7 F8
8 I3 8 P4 8 C4 8 F2
9 - 9 - 9 - 9 -
10 - 10 - 10 - 10 -
11 - 11 - 11 - 11 -
12 - 12 - 12 - 12 -
13 - 13 - 13 - 13 -
14 I5 14 P6 14 C6 14 FP2
15 O1 15 P8 15 T8 15 F6
16 Oz 16 CP6 16 FC6 16 FPz
17 O2 17 CP4 17 FC4 17 F5
18 PO8 18 CP2 18 FC2 18 F1
19 PO4 19 CPz 19 FCz 19 A1
20 POz 20 CP1 20 FC1 20 -
21 PO3 21 CP3 21 FC3 21 -
22 - 22 - 22 - 22 -
23 - 23 - 23 - 23 -
24 AG 24 AG 24 AG 24 AG
25 AG 25 AG 25 AG 25 AG
NOTE:
- denotes no connection
AG denotes analog ground
Analog Input Connector Pin Assignments - VER Lab 64 Chans
CHAN 0 - 15 CHAN 16 - 31 CHAN 32 - 47 CHAN 48 - 63
DB25S Input DB25S Input DB25S Input DB25S Input
Pin Chan. Pin Chan. Pin Chan. Pin Chan.
-------------------------------------------------------------------------
1 SI3 1 M1 1 CP3 1 FC1
2 SIz 2 P7 2 CP5 2 FC3
3 SI4 3 P5 3 TP7 3 FC5
4 I6 4 P3 4 T7 4 F7
5 I4 5 P1 5 C5 5 F3
6 Iz 6 Pz 6 C3 6 Fz
7 I3 7 P2 7 C1 7 F4
8 I5 8 P4 8 Cz 8 F8
9 - 9 - 9 - 9 -
10 - 10 - 10 - 10 -
11 - 11 - 11 - 11 -
12 - 12 - 12 - 12 -
13 - 13 - 13 - 13 -
14 O1 14 P6 14 C2 14 AF4
15 Oz 15 P8 15 C4 15 AFz
16 O2 16 TP8 16 C6 16 AF3
17 PO8 17 CP6 17 T8 17 FP1
18 PO4 18 CP4 18 FC6 18 FP2
19 POz 19 CP2 19 FC4 19 HEOG
20 PO3 20 CPz 20 FC2 20 VEOG
21 PO7 21 CP1 21 FCz 21 FPz
22 - 22 - 22 - 22 -
23 - 23 - 23 - 23 -
24 AG 24 AG 24 AG 24 AG
25 AG 25 AG 25 AG 25 AG
NOTE:
- denotes no connection
AG denotes analog ground