Different baud rates for PL-2303 HX (D)

Hello, I have a cable with a PL-2303 HX (D) chip. I need to change the baud rate to 12000 bps. How can this be done? Is there a way to change the standard baudrates in the drivers? Or maybe a registry entry?

Hi Julien,

Thanks for contacting us! Each operating system (Windows, Mac, Linux) has a different mechanism for setting baud rate – and it’s often set in the specific software of the device you’re connecting to.

Can you say what operating system you’re using and what device?

For some general tips on Windows and Mac, check out …

Windows: http://plugable.com/2011/07/04/how-to…
Mac: http://plugable.com/2011/07/12/instal…


Hi Bernie!

Thanx for your reply. My OS is Windows 7 (32-bit), so the options for setting the baud rate are exactly the same is in the tutorial “How to change the com port” in the above mentioned link. It’s a pull down menu with fixed values. 9600, 14400, etc

I use a Plugable USB to RS-232 DB9 Serial Adapter (Prolific PL2303HX Chipset).

The device is an NAD s170 pre-amplifier that operates at 12000 bps.

I have seen with other suppliers that there are ways to change the driver to set to a specific baud rate. Can this be done with your driver?

Hi Julien,

Are you using the NAD s170 PC control software from the following page?

Will it work if you set the baud to 9600?

Plugable Technologies

a) Yes I am,
b) No, it won’t, see screenshot below


In the manual is stated that in the past, hardware bit-rate converters were available, but nowadays these are obsolete, can’t find them anyware. The conversion to 12000 bps needs to be done in the software / drivers …

Hi Julien,

It may be tough to get this working without a bit-rate converter. I’ve opened a support ticket with NAD and also with Prolific to see if we can figure out a way to set the baud to 12000 in software. I’ll post back when I know more.

Sorry I don’t have a better answer.
Thanks for your patience,

Plugable Technologies

Okay, thanx in advance!

Hi Julien,

It looks like we can’t set the baud rarte to 12000 in software but I did speak with support at NAD and they suggested that the amplifier should be able to connect at 9600 directly, even without a bit rate converter. Is it possible this could work?

Sorry we don’t have a better answer.

Thanks for your patience,





Thanx, for all your help. I really dig your support!! Unfortunately, as you can see in the screenshots. It doesn’t work … that’s a real bummer. My only hope is now on a German company who claim to use a FTDI FT232R chip in their cables, that can be set to 12000 … if I ever get it to work, i’ll post again …

Thanx for now.

Can you send me the details from NAD, maybe I can figure it out with them directly?

Sure, just shoot an email over to support@plugable.com.



I can confirm that with a standard serial cable (no null-modem cable!) and a HARDWARE serial port a working connection can be made. You have to set the serial port to 9600 bps (standard settings worked out of the box for me, but check 8 bits, 1 stop bit, no parity, no flow control)

The s170 PC control software has to be set to 12000 bps. I have succesfully upgraded my software from version 2.32 to 3.03, using the upgrade utility.

The only thing now, is that I have to get an old PC with hardware serial to control from my home (brought the unit to work an performed the upgrade there).

Me happy :slight_smile:


Thanks for the update Julien!

Glad to hear you got it working.