LV vi for mfc

[pari89]

Hello Everyone,

                            I am Using MKS Mass flow controller(type MF1 see the attachment) and instrument has USB setup interface and USB process interface, the problem is that I can recognise the device in NI-max as serial and I used the VISA example to send the ASCII message but in return I am not getting any response. I am stuck and everything is coming to squareone.

Anyone can help me as where I might be going wrong.

[nyc_(is_out_of_here)]

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@pari89 wrote:

Hello Everyone,

                            I am Using MKS Mass flow controller(type MF1 see the attachment) and instrument has USB setup interface and USB process interface, the problem is that I can recognise the device in NI-max as serial and I used the VISA example to send the ASCII message but in return I am not getting any response. I am stuck and everything is coming to squareone.

Anyone can help me as where I might be going wrong.

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Is baurdrate, etc. set up correctly?

[Dennis_Knutson]

What is the exact message you are sending?

[sth]

I programmed a very old MKS MFC a long time ago.  It was a very bad interface and I hope that they have updated it.  If you have the baud rate, number of stop bits and data bits and parity correct then it may be the command terminator character.  I remember something funky about needing that as part of the command string.

[pari89]

yes the baudrate is set to default 115200 with parity none and data bit 8 , stop bit 1

for writing I am using byte to array combination and concatenating it with CR and wire it to the write terminal
for reading i am jst connecting a string. I suppose in reading I should get the value bt it showing error as " timeout before reading" 

[pari89]

aper the manual I have to send    @01--as address C--command which can change, 1.00000---value to set  CR- carriage return 

so it becomes "@01C1.00000 and CR

[sth]

Are you addressing it correctly?  What is the exact string you are sending.  This is an RS-485 emulation so you need to address each device on the serial bus which has a master/slave kind of addressing scheme.

So each command needs to be prefaced with "@XX" where XX is a two byte ascii reprsentation of the device address as set by the high and low rotary switches.  This is followed by 1 byte command and then an optional value.

You should probably create this as a string not a byte array.

[sth]

I guess we are cross posting.....

The "C" command does not take a value.  So "@01C1.0000\r" is an invalid command but you should get an error.

What about the communication indicator lights?  I assume this device is showing up as a serial port correctly and can be opened and the port name read as a property?

Is the "OP" status LED showing activity?  I think it should.

[pari89]

yes I think you are right bt what about reading if it has to read the same kind of ASCII code 

[sth]

I also forgot, are you setting the termination character for the read to be a CR?  How do you terminate the read?