Technical Library

TARGA III External DAQ Usage

Capacitive TechNote LT03-0026

Copyright © 2007 Lion Precision.


Details the use of the National-Instruments-ready DAQ connector on the rear panel of the TARGA III for use with external data acquisition operations.

External Data Acquisition

The TARGA III is configured for easy connection to National Instruments™ data acquisition systems. The rear panel DAQ connector is a high-density 68‑pin connector which connects directly to National Instruments™ E-series cards and USB-6251 data acquisition modules. The specific signals and pinout of the DAQ connector are detailed at the end of this TechNote.

DAQ Connector Pinout


DAQ Connector as viewed on the rear panel. pins

DAQ Connector Signal Descriptions



NI Input



Analog Output ACH1 (+ACH1) Analog output from BNC on display module


Ground ACH9 (–ACH1) Connected to ground


RPM Out ACH7 (+ACH7) Square wave, 1/2 Index input frequency,
0 - 3.3 VDC


Ground ACH15 (–ACH7) Connected to ground


Output Bit 0 DIO5 TTL, Least Significant Digit (See table below)


Output Bit 1 DIO6 TTL (See table below)


Output Bit 2 DIO7 TTL, Most Significant Digit (See table below)


Output Bits

This 3-bit code divides the output voltage range into six divisions according to the following table:

Bit 2

Bit 1

Bit 0

Output Voltage

0 0 0 Vout < –5V (out of range)
0 0 1 –5V < Vout < –2.5V
0 1 0 –2.5V < Vout < 0V
0 1 1 0V < Vout < +2.5V
1 0 0 +2.5V < Vout < +5V
1 0 1 +5V < Vout (out of range)


Index Input

The index connector on the front of the TARGA III is configured for use with the Lion Precision optical RPM sensor (P015-3375). This fiber-optic sensor uses a black mark on the rotating gage pin to generate a square wave (RPM Out) which is half the frequency of the spindle's revolutions per second. Contact a sales engineer or a Lion Precision representative for details.

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