CB-68LP Pinout

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 Data Acquisition Card. The list under the table describes the most commonly used channels.

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 ACH 9	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

The most commonly used channels are:

• ACH# - analog input channel number #
• DAC#OUT - analog output channel number #
• DIO# - digital input/output (I/O) channel number #
• 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

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 the PCI 6014e 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 same map as above, but is labeled in terms of the positive and negative channels for differential mode:

68 Channel 0 +	61 Channel 4 -	15 DGND	08 +5V	01 FREQ_OUT
34 Channel 0 -	27 AIGND	49 DIO2	42 GPCTR1_SRC	35 DGND
67 AIGND	60 Channel 5 +	16 DIO6	9 DGND	2 GPCTR0_OUT
33 Channel 1 +	26 Channel 5 -	50 DGND	43 CONVERT	36 DGND
66 Channel 1 -	59 AIGND	17 DIO1	10 TRIG2	3 GPCTR0_GATE
32 AIGND	25 Channel 6 +	51 DIO5	44 DGND	37 GPCTR0_SRC
65 Channel 2 +	58 Channel 6 -	18 DGND	11 TRIG1	4 DGND
31 Channel 2 -	24 AIGND	52 DIO0	45 EXTSTROBE	38 STARTSCAN
64 AIGND	57 Channel 7 +	19 DIO4	12 DGND	5 WFTRIG
30 Channel 3 +	23 Channel 7 -	53 DGND	46 SCANCLK	39 DGND
63 Channel 3 -	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 Channel 4 +	21 DAC1OUT	NA NA	48 DIO7	41 GPCTR1_GATE

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.