Re: Ability to drive multiple IR transmitters independantly from PC

[nobody@xxxxxxxxxxxx (Dave Houston)]

Alexis <snoopy@xxxxxxxxxxxxxxxxxxxxx> wrote:

>Dave Houston wrote:
>> Windows supports 256 COM ports so this should not be a problem. However,
>> although they use FTDI USB-serial chips, I don't think USB-UIRT uses virtual
>> serial ports. That's why I suggested you contact them to be sure they can
>> distinguish between 20 devices. I believe FTDI provides for this by giving
>> you a way to assign an ID to each device but its been too long since I
>> looked at the details. (These days, a few hours is too long.:()
>
>Hi Dave,
>
>That's interesting, thanks.  I shall definitely get in touch with them
>and see if they can clarify the maximum number of devices a single PC
>can realistically support.

Here are the FTDI ID details from an app note on their website.

<quote>
Each FT232R USB UART IC and FT245R USB FIFO IC has a unique identification
number burnt into it during manufacture, the FTDIChip-ID.

The FTDIChip-ID is readable over USB, but cannot be altered by the end user.
This feature provides a way of tying application software to a specific
device with a high level of security.

The FTDIChip-ID feature can be used without affecting any of the other
device features.
</quote>



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