TECHNOTE LT03-0026
Copyright © 2007 Lion Precision. www.lionprecision.com
Summary
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.
DAQ Connector Signal Descriptions
| Pin | Signal | NI Input | Description |
| 33 | Analog Output | ACH1 (+ACH1) | Analog output from BNC on display module |
| 66 | Ground | ACH9 (–ACH1) | Connected to ground |
| 57 | RPM Out | ACH7 (+ACH7) | Square wave, 1/2 Index input frequency, 0 – 3.3 VDC |
| 23 | Ground | ACH15 (–ACH7) | Connected to ground |
| 51 | Output Bit 0 | DIO5 | TTL, Least Significant Digit (See table below) |
| 16 | Output Bit 1 | DIO6 | TTL (See table below) |
| 48 | 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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