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TTL control of MKS 247D


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8 replies to this topic

#1 Guest_Adrian_*

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Posted 18 May 2005 - 11:16 AM

Greetings,
I'm interested in using Labview to control an MKS 247D, which itself controls four mass flow controllers. The 25-pin pinout diagram is shown here:
http://www.mksinst.com/pin247d.html

Could you recommend a Labjack product for this application?
I'm fairly experienced in Labview, but I'm a relative novice when it comes to TTL, DAQ boards, and the like. Thanks for any help you are able to offer.
-Adrian

#2 Guest_Guest_*

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Posted 18 May 2005 - 01:22 PM

just to elaborate on my question... I originally assumed that I would be able to use the Labjack U12 to control this device, but I am now concerned that the U12 does not have enough analogue outputs for my needs (the MKS 247D pinout diagram indicates that I should need at least 8 such outputs).

#3 LabJack Support

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Posted 18 May 2005 - 01:39 PM

So I gather that you would connect the LabJack to interface connector P6 to control/monitor the 4 MFCs. It appears that each MFC would use 3 connections, but I can't find any more information about those inputs/outputs. Flow ON/OFF Input: Presumably this is a standard CMOS/TTL compatible input, but to know for sure they should provide the high/low thresholds. Set Point Input: Is this an analog input? What is the range? Transducer/Scaled Output: Presumably these are analog outputs, but what are the ranges?

#4 Guest_Adrian_*

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Posted 18 May 2005 - 02:03 PM

Thanks for your rapid response. Your assessment of the situation is correct. According to the product data sheet (http://www.mksinst.c...df/mfcontlr.pdf), the flow on/off input is TTL, the set point input is 0-5V, the signal output is 0-5V, and the scaled signal output is 0-2V. I think "transducer" and "signal" mean the same thing here. I should mention that I'm not really familiar with what TTL means. Thanks again for your help. -Adrian

#5 LabJack Support

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Posted 18 May 2005 - 02:13 PM

OK. That info is all good for the U12 or UE9. There are a couple issues though: 1) You need 4 analog outputs to go to the Set Point Inputs (assuming you need independent control of all 4 set points). Both the U12 and UE9 only have 2 analog outputs, so you would need 2 LabJacks to get 4 analog outputs. 2) The UE9 has absolute accurate analog outputs (typical span is 0 to 4.86 volts), but on the U12 the analog outputs are ratiometric with the LabJack supply voltage. If you are doing feedback control, this might not be a problem, but if you do need absolute accuracy from the U12 outputs you can feed them back into analog inputs and handle it in software.

#6 Guest_Adrian_*

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Posted 19 May 2005 - 07:53 AM

Okay, so I could, for example, use two U12 units, one plugged into each USB port on my laptop to yield the needed four outputs. Is it fairly straight forward to control two labjacks at the same time from a single labview VI? As for the U12's ratiometric analog outputs, I think I can probably handle this, since I will get input (feedback) from the MFCs' control box. Thanks again for your help with this. -Adrian

#7 LabJack Support

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Posted 19 May 2005 - 08:10 AM

Multiple U12s is easy. Use our sample app LJconfig to assign a unique Local ID to each unit (such as #1 and #2). Then in your program, if you are using calls to EAnalogOut to control the analog outputs, you simply pass 1 or 2 for to the "idnum" input to specify which U12 you are talking to at any time.

#8 ariesnit

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Posted 29 January 2014 - 11:09 PM

Sir can i get Any New product for controlling MKS 247D through my LAPTOP



#9 LabJack Support

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Posted 30 January 2014 - 02:59 PM

I suggest a U3-HV, U6, or T7, with 1x-2x LJTick-DACs and 1x CB15.

 

http://labjack.com/u3

http://labjack.com/u6

http://labjack.com/t7

http://labjack.com/catalog/ljtick-dac

http://labjack.com/c...-terminal-board

 

The lowest cost solution would be 1x U3-HV, 1x CB15, and 1x LJTick-DAC.  This would use the 2 built-in DACs on the U3, but if you want all 4 DACs to be the same use 2x LJTick-DACs.




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