Mac os x usb serial port terminal

Furthermore, using the third party application Serial to just write plain text to the terminal works without issue - no garbage, and newlines are handled correctly. Something about Mac OS's configuration with getty is causing issues with this terminal. I found a way to get a usable terminal session.

Run screen , pointed at the serial port like so:. The prompt line is doubled.

Setting up a Serial Console in Mac OS X

There's also still a ton of noise on the line - any commands that dump a lot of text at once like an ls results in garbled output. After much fiddling around, I finally figured out the right combination of things to use for a fully usable terminal. This made troubleshooting much easier, since the serial port stopped getting stuck after each experiment, meaning no more reboots to become usable again. Note: A previous version of this guide suggested using a different cable - this particular cable will let us use the modem port on the terminal, correcting some various display glitches! I was left wondering how to set the terminal type for the login, since as described above, just using the std.

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This sets the login banner to a simple CRLF, sets the line speed to baud, and most importantly, sets the terminal to vt This will become important later. Now we need to actually start this. As described elsewhere, you can't just run getty , since that's restricted to launchd. We have to make and load a daemon plist. If you do this yourself, the third string will almost certainly be different, since this is the serial number of the adapter.

Controlling a RS232 device from a terminal on Mac

Also note the setting of KeepAlive to true - this means that when the process exits say, we log out , a new instance will spawn. Without this, you have to manually start the job. Finally, the terminal itself has to be configured. This is a Wyse WY50, but it can emulate many other terminal types. I find that VT mode gives the best experience.

We're ready to go. Make sure the terminal is on and plugged in to the port, verify the settings are as described above both gettytab and the plist file you created. You might notice that certain applications still write garbage onto the screen, especially if they do anything fancy like bold text or certain ASCII characters. Most recent machines, macs included, use UTF-8 for their character set.

But this venerable glass terminal has no idea what that is! You'll need to set the locale to the appropriate legacy codepage for your region.

Using USB to RS232 Cable with Mac Terminal

You really don't want to set this system wide, but only on sessions where your glass terminal is being used. Home Questions Tags Users Unanswered. Background I've got a Wyse WY terminal here that, for various nolstagia and productivity reasons really!

Running getty by hand: No output. Different baud rates set on the getty command and the terminal from to : No output. Using the tty. On another port So, I can get basic communication if the computer is connected to the terminal by way of the AUX port.

Getting a getty running

With settings as follows: getty running under launchd with the above plist Terminal personality set to VT Flow control disabled However, this results in a lot of garbage characters on the terminal screen. With the settings as described above, here's an example of what I mean on the terminal output: You can see some noise once the port is initialized, and then a "clean" login display. Any ideas? Update 1 I found a way to get a usable terminal session. However, this method still has some drawbacks. I'm still searching for a way to have the terminal Just Work on login.

Mikey T. I wonder if that could be UTF-8 you're seeing there? Actually if I try just blasting text to it over the device node, I get nothing. I'm guessing it's very particular about the baud rate used. Of the two, I found the open source PL driver to be slow and observed occasional data corruption I did not try the closed source driver but heard worse things.

I have found FTDI devices to perform more consistently. Starting with Drivers for other converters may also be present, but I have not used them. If not, you will have to alter the expected device ID in the driver configuration. If you encounter strange issues of any kind with the built-in driver, try the official FTDI driver as well.

Supposedly, the driver priority of the built-in driver is set so that installing the official driver will override it without causing any conflicts, however I have not conclusively verified this. For an example of how to alter the device ID or disable the built-in driver follow just step 1 , see this blog post. In the process of doing this myself, I learned a bit about the kernel extension of which these drivers are each an instance system in OS X.

The basic idea is that each has a [drivername]. For an immediate load or unload, run kextload [path to. To see the list of currently installed extensions, run kextstat e. After re-enabling a driver, the driver may not reload even after the next reboot because a separate cache of kernel extensions is kept to speed up enumeration on boot. The next step is to test the serial port using some sort of terminal emulation program. I used goSerial , which happened to be the first one I found.

It worked fine for my purposes, but better ones may exist.

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In the Unix world, getty is the program that presents a login prompt. It appears that as of Instead, I found that creating a script to spawn the getty that is run by launchd does the trick. I therefore created a file called serialconsole. Note that first bit sets the daemon name, the second bit sets the program arguments one "string" per argument , and the last bit keepalive instructs launchd to restart the daemon when it exits eg, the user logs out of the console. As noted later, the "cu. Initially, this was reported in only some cases but seems to be the norm as of Using the program launchctl, you can manually reload these configuration files and restart daemons.

Here are some self-explanatory commands you might use, of which only the first two should be necessary to start the getty manually after creating the configuration file above. Of course, rebooting should also work if you're lazy. However, the next time it attempts to restart it within a minute or so , it should succeed. Check that log file for other errors.

As of Supposedly the following is the preferred sequence:. However, in my case these did not seem to be sufficient, whereas launchctl load did the trick.