Checksum

[LaurenLL]

Hi,

Since you are using third party hardware, the commands will most likely be device specific.  You can test the serial connection itself by performing a loopback test.  This simply verifies that your serial connection and cable are working.

In terms of communicating with the device itself, you will need to consult the user manual or contact the device manufacturer.  The commands should be fairly similar to those of the Digital MFC Interface, so the instructions for that should be fairly useful.

Regards,

Lauren L

[ali26]

ali26

I used  Labview version 8.2, and the MFC 8100 series unit of celerity. I also used the RS485 serial communication. and the issue was that I anly have the instructions of the RS485 communication Protocol of Digital MFC Interface.

thank you for you response "merci pour votre aide"

[ali26]

laurant L,

what about the checksum, is this instruction will sent to the MFC as the other instructions?

think you
ali26

[gotgot]

Hi,

I 'm a beguner at labview, and I need help , because I want to commande the MFC and only what I have is the instructions. and I don't know the way and the forme that this instructions is sent to the instrument " MFC 1800 series celerity, communication RS485, and labview8.2".

think you for help 

[LaurenLL]

Hi,

In terms of getting started with serial communication, I recommend taking a look at our Developer Zone tutorial on Instrument Control in LabVIEW.  It provides a good step by step guide on getting started, determining what types of commands to send, and communicating with instruments.  There are also a number of good related links at the bottom of the document that may be worth checking out.

On the subject of the checksum, I am not entirely sure what you are asking.  The checksum is usually transmitted with data to assist in error detection, but the instruction itself would be device specific.  If you can clarify your question, maybe I can be of more assistance.

Regards,

Lauren L 

[gotgot]

bonjour ts le monde,

voila je veux commander le mass flow controller/meter 1800series  sous labview.  j'utilise la communication serie RS485, avec   VISA  je veux envoyer  des instructions (format Hexa), mais le prolème c'est que les instructions que j'envoie je les reçoi sur le buffer à lire.

merci pour votre aide

[O_Proulx]

Bonjour gotgot,

S.V.P.  Utiliser le forum francophone pour les questions en français.

En ce qui a trait à votre problème, de qu'elle "buffer à lire" parler vous.  Si vous faite un "loop back test", vous aller recevoir les instructions sur le même port et donc sur votre buffer à lire.  Si vous connecter votre intrument, le buffer à lire de votre instrument reçoit les instructions.  Êtes-vous en train de faire un loop back test?  Sinon, comment avez vous connecté votre système?  Est-ce que vous avez tester votre instrument dans Measurement and Automation Explorer?

[MFC Expert]

Did you guys figure out the MFC com. thingy.  Let me know if you need any more information.

Tim

MFChelp.com