Forums > MaxMSP

Serial Obj, more than 115200 baud rate.

Oct 11 2013 | 11:50 am

Hi, I’m trying to set the baud rate of the Serial object at a value greater than his maximal value (should run at 250Kb rate) to make it communicate to a FTDI usb serial interface mounting a RS485 chip, for DMX data sending from Max.
The interface is perfectly running with other DMX softwares (see Madrix, and that from a Sony Vaio i7 with 8 Mb Ram – 2 GHz.
Also the FTDI driver is perfectly installed and running, with the last drivers version (
From Max nothing works, in VCP mode or not, the maximum baud rate is 115200b, and I get flashing data only at 57600baud, but that it’s not correct for DMX data transmission. Any idea about that? Thanks in advance.
P.S. The interfaces name is FTDI ENTTEC DMX USB (#A101L8D0) ms/FPS 30/33.3 Optimized Frames

Oct 12 2013 | 6:54 pm

If you’re motivated you could build the interface I just designed, comes with max examples and even works directly with an ipad :)

Oct 13 2013 | 2:28 pm

Hi Nat, many thanks for your support and your links, I’ll give it a try, maybe it will work, I’ll let you know.!

Oct 13 2013 | 6:46 pm

For what its worth, here at Sensacell we’ve been using a USB-RS485 adapter with the serial object set to 230400 baud for years without any issues, so the maximum baud rate should not be an issue. Our standard adapter is the ATC820, which also has the FTDI chipset.
I have a test setup where I plugin two adapters to my laptop and push serial data out of my Max patcher on one and read the data in on the other using the free app Bray’s Terminal (
This may be helpful to you for testing vanilla serial transmission using the serial object. DMX on the wire is just uni-directional rs485, right? I thought that it ran at 230400 baud also…

Oct 14 2013 | 10:28 am

Hi to all, last news. Imp.dmx.usbpro is not working. The interface uses the same protocol as the Open DMX Usb interface (….

And thanks to Madbutter, I’ll try Brays’s Terminal app, just downloaded.

Jul 01 2015 | 7:04 am

Hello everybody,
I assembled a patcher to output DMX from Max following the guidelines I found here: (nice and easy).
Using a FTDI Usb to serial converter the patcher works fine on my i7 Windows7 64bit machine while it does not work on my i5 Yosemite MacBookPro 13" late 2013.
The [serial] object on the OSX machine seems to work only at the baudrates written in the object reference (it does not accept either the 250K or the 96K rates) , making it impossible to generate a DMX compliant output.

Any suggestion would be really appreciated.


Dec 30 2015 | 4:47 pm

Hi Tom ,
Any issues with your problem ?
I use a ftdi rs485 usb cable and the vpc drivers , using mac os9 and max 6.1 .
I don’t understand what kind of message i have to send to my serial object to have a simple straight connection with my dimmer .
Macbutter says that a 230400 baud serial should work , anyone test it ?

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Forums > MaxMSP