CB-68LP Pinout

NI CB-68LP

The National Instruments CB-68LP connection block allows for simple connections to NI data acquisition cards through a ribbon cable. The CB-68LP in particular has screw-operated window connections that allow for quick connections to wires.

Mapping

The following chart lists the different connections as laid out on the National Instruments CB-68LP connection block when used in conjunction with the National Instruments PCI 6014e or 6221 Data Acquisition Card. The list under the table describes the most commonly used channels.

The most commonly used channels are:

• ACH# - analog input channel number #
  • Note, in differential mode, ACH0-ACH7 measure the + terminal voltage while ACH8-ACH15 measure the - terminal voltage for channels 0-7, respectively.
  • Each voltage is measured with respect to AIGND
• DAC#OUT - analog output channel number #
  • Each voltage is set relative to AOGND
• DIO# - digital input/output (I/O) channel number # (6014e only)
  • Each voltage is measured or set relative to DGND
• DIO#P@ - digital input/output (I/O) channel number # on port @ (6221 only)
  • Each voltage is measured or set relative to DGND
• AIGND - ground (0 V) for the analog input channels
• AOGND - ground (0 V) for the analog output channels
• DGND - ground (0 V) for the digital I/O channels

Items in bold are the same for both cards; items in bold italics are functionally the same for both cards: Port 0 Digital I/O on the 6221 works the same as the Digital I/O on the 6014e. Each port can be configured as input or output - the individual channels in a port must all do the same thing. Note that the main places the cards differ is that the 6221 has a total of 24 DIO channels split among three ports while the 6014e only has 8 channels tied to a single port.

PCI 6014e

The following are the connections for the PCI 6014e card:

68 ACH0	61 ACH12	15 DGND	08 +5V	01 FREQ_OUT
34 ACH8	27 AIGND	49 DIO2	42 GPCTR1_SRC	35 DGND
67 AIGND	60 ACH5	16 DIO6	9 DGND	2 GPCTR0_OUT
33 ACH1	26 ACH13	50 DGND	43 CONVERT	36 DGND
66 ACH9	59 AIGND	17 DIO1	10 TRIG2	3 GPCTR0_GATE
32 AIGND	25 ACH6	51 DIO5	44 DGND	37 GPCTR0_SRC
65 ACH2	58 ACH14	18 DGND	11 TRIG1	4 DGND
31 ACH10	24 AIGND	52 DIO0	45 EXTSTROBE	38 STARTSCAN
64 AIGND	57 ACH7	19 DIO4	12 DGND	5 WFTRIG
30 ACH3	23 ACH15	53 DGND	46 SCANCLK	39 DGND
63 ACH11	56 AIGND	20 RESERVED	13 DGND	6 UPDATE
29 AIGND	22 DAC0OUT	54 AOGND	47 DIO3	40 GPCTR1_OUT
62 AISENSE	55 AOGND	NA NA	14 +5V	7 DGND
28 ACH4	21 DAC1OUT	NA NA	48 DIO7	41 GPCTR1_GATE

PCI 6221

The following are the connections for the PCI 6221 card:

68 ACH0	61 ACH12	15 DGND	08 +5V	01 DIO6P2
34 ACH8	27 AIGND	49 DIO2P0	42 DIO3P1	35 DGND
67 AIGND	60 ACH5	16 DIO6P0	9 DGND	2 DIO4P2
33 ACH1	26 ACH13	50 DGND	43 DIO2P1	36 DGND
66 ACH9	59 AIGND	17 DIO1P0	10 DIO1P1	3 DIO1P2
32 AIGND	25 ACH6	51 DIO5P0	44 DGND	37 DIO0P2
65 ACH2	58 ACH14	18 DGND	11 DIO0P1	4 DGND
31 ACH10	24 AIGND	52 DIO0P0	45 DIO2P2	38 DIO7P1
64 AIGND	57 ACH7	19 DIO4P0	12 DGND	5 DIO6P1
30 ACH3	23 ACH15	53 DGND	46 DIO3P2	39 DIO7P2
63 ACH11	56 AIGND	20 RESERVED	13 DGND	6 DIO5P1
29 AIGND	22 DAC0OUT	54 AOGND	47 DIO3P0	40 DIO5P2
62 AISENSE	55 AOGND	NA NA	14 +5V	7 DGND
28 ACH4	21 DAC1OUT	NA NA	48 DIO7P0	41 DIO4P1

Differential Channels

When the DAQ card is reading voltages in differential mode, two voltage measurements are required to actually measure a voltage difference. For the CB-68LP in conjunction with either the PCI 6014e or 6221 card, each differential input channel uses two lines - the line that is the same number as the channel is the + terminal and the line that is 8 higher than the channel is the - terminal. For example, taking a voltage on differential channel 4 would mean calculating the voltage difference between ACH4 on Line 28 and ACH12 on Line 61. The chart below shows the analog input channels but is labeled in terms of the positive and negative channels for differential mode:

68 Channel 0 +	61 Channel 4 -	15	08	01
34 Channel 0 -	27	49	42	35
67	60 Channel 5 +	16	9	2
33 Channel 1 +	26 Channel 5 -	50	43	36
66 Channel 1 -	59	17	10	3
32	25 Channel 6 +	51	44	37
65 Channel 2 +	58 Channel 6 -	18	11	4
31 Channel 2 -	24	52	45	38
64	57 Channel 7 +	19	12	5
30 Channel 3 +	23 Channel 7 -	53	46	39
63 Channel 3 -	56	20	13	6
29	22	54	47	40
62	55	NA	14	7
28 Channel 4 +	21	NA	48	41

Notice that, for the most part, pairs are right next to each other. The one exception is where Channel 4 is split between the first and second columns.

Remarks

The newest version of the DAQ toolbox limits the 6014e cards to sampling frequencies below that of which it is capable. To bring back the original functionality, edit:

• C:\Program Files\MATLAB\R-----\toolbox\daq\daq\private\mwnidaq.ini

or

• C:\Program Files\MATLAB\R-----\toolbox\daq\daq\private\mwnidaqmx.ini

to change the rates back.

Questions

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External Links

• NI 6014 Page
• NI 6221 Page