Problem with Com port

[inuyasha84]

Hi guys. I have written a driver to communicate with a COM port (FTDI serial adapter).  On the pc from which I'm writing now (windows XP) it works properly, but when I try to use the same driver on another pc (win 7) labview see the port but isn't able to comunicate . I tried also to use a software like Tera Term to see if the com works and trying the echo it works good...so I don't understand where the problem is on this w7 pc... 

should I install some labview drivers on the w7 pc? I have already installed
NI run time installer
NI max
NI Visa run time

[LV_Pro]

NI Serial?

[inuyasha84]

ehm...where is it?

[Dennis_Knutson]

NI Serial is only for serial devices from NI. You don't need it.

Check in MAX if the com port name is different.

[JÞB]

NI Serial won't help (its for NI serial cards not 3rd party USB-Serial bridges)

LabVIEW sees the VCP in Win7 but does not communicate: Works on XP: "Something" happens with Echo on from teraterm.

I'l guess either:

• Wrong serial cable or settings and you are fooling yourself with the tereterm app and are seeing the echo only.  With Echo on any character sent should be doubled.
• Outdated FTDI Driver that does not support Win7.

[inuyasha84]

Already checked. The thing that is strange is that I see it in max COM25 when the driver is launched I can select it in the Visa control like COM25 but when it try to access phisically  I get the error like if the instrument isn't connected

[inuyasha84]

well the problem is on W7 only because as I told on Xp it works. 

do you think that it could be a problem of the driver? 

The com port is the FTDI USB to 232 Adapter TTL232RG-VREG3V3

According to the productor homepage

http://www.ftdichip.com/FTDrivers.htm

it supports the W7

[Eric1977]

Like others have said, have you verified that the driver your using is compatible with Windows 7?

[JÞB]

FTDI Link

the driver download page is linked.  Worth a shot to get it and try it

[inuyasha84]

I have already installed them as I have written before they should support the W7.

the problem is elsewhere.

Is it possible that the visa control see the port (when I click refresh the port is there) but can't open it?