CB-68LP Pinout

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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.