Serial Obj, more than 115200 baud rate.

Oct 11, 2013 at 11:50am

Serial Obj, more than 115200 baud rate.

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 http://www.madrix.com/), 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 (2.8.30.0).
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

#267780
Oct 12, 2013 at 6:54pm

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

https://github.com/natcl/dmx_midi

#267887
Oct 12, 2013 at 7:01pm
#267888
Oct 13, 2013 at 2:28pm

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.!

#267944
Oct 13, 2013 at 6:46pm

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 (https://sites.google.com/site/terminalbpp/).
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…

#267955
Oct 14, 2013 at 10:28am

Hi to all, last news. Imp.dmx.usbpro is not working. The interface uses the same protocol as the Open DMX Usb interface (http://www.enttec.com/?main_menu=Products&pn=70303)….

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

#268030

You must be logged in to reply to this topic.