Mac's and serial TTY's Mac's are excellent tools for accessing serial device TTY ports (to console into PBX's, switches, and routers). You just need a serial to USB adapter, the right driver, and some Terminal. You can use, although (or a ) offer more features and functionality. Drivers: Most Serial-to-USB adapters will work on a Mac with one of the following OS X drivers. UPDATE: Mavericks (10.9) includes a driver for FTDI-based Serial-to-USB adapters.

Prolific PL2303: FTDI USB Serial: NOTE: It may be necessary to remove any previous driver before installing a newer one, eg: $ sudo rm -rf /System/Library/Extensions/ProlificUsbSerial.kext If your adapter doesn't work with either of these, try the following sources: • - CP210x USB to UART Bridge Virtual COM Port (VCP) drivers. • - USB Serial Adapters: F5U257, F5U103, F5U003 (poor OS X support).

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• serial-USB adapter drivers can be found in their Support Section. After installing the correct driver, plug in your USB-Serial adapter, and open a Terminal session (Applications/Utilities). Enter the command ls /dev/cu.*, and look for something like usbserial (or similar): $ ls /dev/cu.* /dev/cu.Bluetooth-Modem /dev/cu.iPhone-WirelessiAP /dev/cu.Bluetooth-PDA-Sync/dev/cu.usbserial This indicates the USB-Serial driver is working.

Select this port name in a terminal program. Note: Check your adapter works after an OS Update, as you may have to re-install the driver. You might notice that each serial device shows up twice in /dev, once as a tty.* and once as a cu.*. So, what's the difference? Well, TTY devices are for calling into UNIX systems, whereas CU (Call-Up) devices are for calling out from them (eg, modems). We want to call-out from our Mac, so /dev/cu.* is the correct device to use.

The technical difference is that /dev/tty.* devices will wait (or listen) for DCD (data-carrier-detect), eg, someone calling in, before responding. /dev/cu.* devices do not assert DCD, so they will always connect (respond or succeed) immediately. Software: Having installed the right driver, our USB-Serial adapter will show up in /dev/cu.* (shown above).

We now need to install some terminal emulation software before we can connect to anything. • Two terminal methods are and • For a GUI solution, see Note: If you can't find a driver for your adapter (eg, Belkin), try which has built-in support for many USB-Serial devices. Screen It's not actually necessary to download an install extra software, as you can use the Mac OS X built in Terminal and screen. Screen lacks some features, but it does include VT100/ANSI terminal emulation, and can be extremely useful.

• Open an OS X terminal session (window) • Find the right TTY device. Type: ls /dev/cu.* With the USB-Serial adapter plugged in, you'll get a list, including something like this: $ ls /dev/cu.* /dev/cu.Bluetooth-Modem /dev/cu.iPhone-WirelessiAP /dev/cu.Bluetooth-PDA-Sync/dev/cu.usbserial. • Then type: screen /dev/cu.usbserial 9600 (in this example). The 9600 at the end is the baud rate.

You can use any standard rate, eg, 9600, or 19200 for a Sig Server! • To quit the screen app, type CTRL-A, then CTRL-. Type man screen in Terminal for further information on screen.

(use 'enter' or 'space' to scroll, and 'q' to quit). Minicom Alternatively, if you'd like a few more features, and a retro feel, you can install. Minicom supports VT100 emulation, which means it sorta kinda works with Meridian Mail (Function keys: fn + f-key). • Download and run the package installer. • Then manually edit your $PATH with sudo nano /private/etc/paths. • Add the following line to the bottom of the file: /opt/minicom/2.2/bin, save and exit - then relaunch the terminal. Run minicom -s first to configure your serial interface device name, and other options.

Then, Save setup as dfl (default) and Exit. Your serial interface device name is found with ls /dev/cu.* (as shown above). Always launch minicom, with your selected serial adapter plugged in and available to avoid an error. In the example below, the serial device is /dev/cu.usbserial. Franco Belge Lorraine Manual Lymphatic Drainage here.

Command Summary In minicom, commands can be called by CTRL-A, for example, change your serial port settings with CTRL-A P Press CTRL-A Z for a Command Summary, and help on special keys. Enter CTRL-A X to quit.

HINT: Change your OS X terminal window size to 80x25 (1 line more) so you can see the bottom Minicom status bar. (Terminal Preferences ► Settings ► Window). Open a new window for this change to take effect. Note, the minicom installer creates /opt, and its not hidden in the OS X finder. Rectify this with: sudo chflags hidden /opt Connecting With handshaking set to software ( xon/xoff) or none, which covers most devices, serial data communication needs just 3 wires: RXD (2), TXD (3), and GND (5). Generally, hitting should cause a response, or should 're-draw' the screen. If you don't get any characters, try adding a Null-Modem cable or adapter, which swaps RXD and TXD (pins 2 and 3).