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Renaming serial ports in unix

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Operating Systems OS X (Apple) Renaming serial ports in unix
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Old 05-24-2012
Renaming serial ports in unix
Hello everyone, this is my first post and I am by no means a unix expert, so I hope I explain my issue well.

I'm on a mac (mac mini), 10.7.

My question is about serial port names. I have an arduino microcontroller plugged in via usb, and every time the computer is shut down it gives the arduino a new auto-generated name (some variation of tty.usbmodem111 or tty.usbmodem121).

The problem is that I am communicating with my arduino via firmata with an external program where I have set the correct serial port name by hand. So of course, whenever the computer restarts and then renames the serial port that my arduino is on, my program can no longer find it!

So I need to find a way to manage this issue, either by making sure it always names the arduino serial port consistently. Or, maybe a script that can be executed to re-name the serial port to something pre-set. Or any other ideas for dealing with this renaming issue.

I really need to solve this problem, as I will not be able to rename the serial port by hand each time.

Any help would by very greatly appreciated, I really need to solve this issue.

Best,
Erik
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LEARN ABOUT ULTRIX

dc

dc(4)							     Kernel Interfaces Manual							     dc(4)

Name
       dc - serial line/mouse/keyboard

Syntax
       device	 dc0  at ibus?	vector dcintr

Description
       The  serial line controller provides four ports, with modem control on two of the ports.  The DECstation 3100 and DECstation 2100 only pro-
       vide partial modem control.  The DECstation 5000 provides full modem control. The ports are used as follows:

       Port	 Usage
       0	 Graphics device keyboard at 4800 BPS
       1	 Mouse or tablet at 4800 BPS
       2	 Communications port 1 (w/modem control)/local terminal
       3	 Communications port 2 (w/modem control)/local terminal

       Each communication port from the serial line controller behaves as described in and can be set to run at any of 16 speeds.  For the  encod-
       ing, see

       When  a	graphics device is not being used as the system console, communications port 2 becomes the system console.  In this configuration,
       the port can only be used at 9600 BPS and no modem control is supported.

       The serial line driver operates in interrupt-per-character mode (all pending characters are flushed from the silo on each interrupt).

Restrictions
       Speed must be set to 9600 BPS on the console port and 4800 BPS on ports used by graphics devices.  The serial  line  driver  enforces  this
       restriction; that is, changing speeds with the command may not always work on these ports.

Files
       console terminal

       local terminal

       local terminal

See Also
       console(4), devio(4), tty(4), ttys(5), MAKEDEV(8)

								       RISC								     dc(4)