Using Teledyne Hastings mass flow controller HFC-202 in Labview 8.6

[rogerspass]

Hello All,

I just come across in using HFC-202 in labview. I start with looking its document here in.
http://www.teledyne-hi.com/Manual/Flow/140-102009_200-202%20flometers-contrllers.pdf

The pin assignment figure is shown here.

I only soldered pin 5,6,7,9,11,12,14 of D-type connector. My DAQ card is PCI-MIO-16XE-10 (NI 6030E) connect with SCC-68.

Those steps I did are:
1. 15V DC power supply through pin 9 and 11.
2. Pin 6 connect to AI7 (0-5v) of SCC-68 with RSE terminal configuration.
3. Pin 14 connect to AO1 (0-5v) of SCC-68 with RSE and 1 sample (on demand) gereration mode. 
4. Pin 5, 7 and 12 are all connect to ground of power suppory

My questions are:
1. In step 2: There supposed has a signal need to be connected at negative port of AI7. Which pin signal should I put?

I also tried wiring the grounding of power supply to the negative port of AI7 but no go.
Also, should I use RSE or differential?

2. In step 3: Do I need to connect any pin signal to AO1 GND? Which pin signal should I put?
 
3. I'm not quite sure about the function of pin 15. I suppose it will not affect the controlling.
 

Can someone give me some idea on how to wire and controll it correctly?
Any comment would be appreciated.

Thanks a lot!

Roger

[Ali M]

Hello,

For RSE, I would try connecting pin 6 to AI7, the common to AIGND and pin 14 to AO1. Also, take into consideration the following filed wiring recommendations included in the link below to prevent floating signals/ground loops. Additionally, I have also included the connection diagram of the SCC-68 terminal block for an E-Series DAQ device (see page 41).

1. Field Wiring and Noise Considerations for Analog Signals: http://zone.ni.com/devzone/cda/tut/p/id/3344

2. SCC-68 User Guide and Specifications: http://digital.ni.com/manuals.nsf/websearch/6ECC13E530315D21862571C3004FF365

Regards,

Ali M

Applictions Engineer

National Instruments