MKS PR4000B reply equals command

[PTimmer]

Dear friends of LabView,

i am trying to control 2 MFCs with a MKS PR4000 using the driver provided by MKS. Setting a setpoint works fine, however when i try to read out the actual flow i get the command as a response (?AV1<CR> -> ?AV1). Does anyone have an idea what is going on?

Regards,

Phillip

[wiebe@CARYA]

That should be in the manual, specifically in the communication chapter.

Some devices echo the command if it's incorrect (again, better check the spec). If a working command doesn't echo, that might be what's happening.

I'd have a look, but the manufacturer makes me register (*sigh*).

[PTimmer]

Here is the manual. In case of an error it is supposed to give an error code not echo the command as far as i see it.

[wiebe@CARYA]

Can you look in the driver VI?

Who made the driver? They should know...

[PTimmer · Accepted solution]

Te Driver is from the 90s and very simple. When i send the command via 232analyzer i get the same result. So never mind its a device issue. Thanks for everyones help tho.

[wiebe@CARYA]

+1 for keeping us informed and posting\accepting a solution.

[PTimmer]

Thanks mate.

[amazed]

I would drop the question mark (AV1[cr] )but would use it as shown when asking value of setpt.