Do you use direct with a Tiptel phone with serial interface that is connected to your Mac via a USB serial adapter?

Then you need a driver for this adapter.


Support from your vendor

Because of the large number of available USB serial adapters, we cannot support these adapters and their drivers. Please always contact your vendor where you purchased the adapter, or the adaptor's manufacurer.

In addition, we have collected all information that we know about the USB serial adapter drivers on this page. Many questions of our customers can be answered with this information.


New driver for macOS High Sierra?

After past OS updates, some customers reported that direct no longer worked after the upgrade.

In some cases the driver of the USB serial adapters just needed to be reinstalled after the OS update. In other cases, a new driver version was required.

This might be the case with the update to macOS High Sierra as well.

Since the adapter's manufacturers often only provide sparse information about OS compatibility of specific driver versions, we recommend to use the update to macOS High Sierra to also update your USB serial adapter's driver. Even in those cases where your current driver version seems to run under macOS High Sierra.


macOS High Sierra requires user approval to load new hardware drivers

Please note: macOS High Sierra introduced a new security feature that requires user approval before loading new hardware drivers.

A warning panel will pop up when the system tries to load the new driver for the first time. Depending on the driver this may be during driver installation, after the next system reboot, or when the USB serial adapter is first plugged in. At this time you will need to open System Preferences, select the Security & Privacy section, and click Allow.

You will only need to do this once. You may not have to do this at all if a previous version of the driver had already been installed on your computer before you upgraded to macOS High Sierra.

Possible pitfalls:

  • The approval UI in System Preferences will only be visible for 30 minutes. If you wait too long, you will no longer be able to approve loading of the driver. Try unplugging and reconnecting the USB serial adapter, then going back to the System Preferences main page, and then reopening the Security & Privacy section. This may cause the UI to reappear.
  • The warning panel will only pop up when the system tries to load the driver for the first time. If you did not approve then, no warning panel will be shown in the future (the approval UI in System Preferences will reappear though).
  • You may need to quit direct and unplug and reconnect the USB serial adapter after having approved loading of the driver.

See Apple Technical Note TN2459 (User-Approved Kernel Extension Loading) for details.


Driver versions

Please first check what kind of USB serial adapter you are using. The important thing here is not the manufacturer of the adapter (of which there are many), but the manufacturer of the adapter's chip set.

We are aware of adapters with chip sets of three manufacturers: FTDI, Keyspan, and Prolific.

Please use our instructions at the end of this page to determine the type of USB serial adapter that you are using.

FTDI adapter

If you are using an adapter with an FTDI chip set (e.g. from DeLock or Digitus), please install FTDI's current driver version.

Here is FTDI's overview page.

As of October 2017 FTDI offers:

  • driver version 2.4.2 for macOS 10.9 and above
  • driver version 2.2.18 for macOS 10.3 to 10.8

Usage with macOS High Sierra (10.13)
Driver version 2.4.2 for macOS 10.9 and above can be installed under macOS High Sierra where it works as intended.

But please review the note on the required user approval under macOS High Sierra.

Keyspan adapter

If you are using a Keyspan adapter (USA-19HS), please install the manufacturer Tripp Lite's current driver version.

Here is Tripp Lite's overview page. We found the current drivers of the USA-19HS by searching by model number for "USA" (searching for "USA-19HS" did not yield any results).

As of October 2017 Tripp Lite offers:

  • a driver for macOS 10.12 Beta (driver version 4.0b4),
  • a driver for macOS 10.9 to 10.11 (driver version 4),
  • a driver for macOS 10.7 to 10.8.x (driver version 3.0.757),
  • a driver for macOS 10.6 (also driver version 3.0.757), as well as
  • various drivers for older macOS releases

Usage with macOS High Sierra (10.13)
Driver version 4.0b4 for macOS 10.12 Beta can be installed under macOS High Sierra.

We did not verify that this driver actually works but we assume it does. If you successfully use this driver with macOS High Sierra, please let us know.

In any case please review the note on the required user approval under macOS High Sierra.

Note: Driver version 4 for macOS 10.9 to 10.11 could only be installed as long as the installer package was not located in a folder with space characters in its path name (!). This no longer seems to be a problem in the installer of driver version 4.0b4 for macOS 10.12 Beta.

Prolific adapter

If you are using an adapter with a Prolific chip set (e.g. from Manhattan or Hama), please install Prolific's current driver version.

Here is Prolific's overview page (if you are asked to log in, please use GUEST als user name and password). Click on the link to PL2303 USB to Serial Drivers.

As of October 2017 Prolific offers:

  • driver version 1.6.1 for macOS 10.9 to 10.13

Usage with macOS High Sierra (10.13)
Driver version 1.6.1 for macOS 10.9 to 10.13 can be installed under macOS Sierra.

We did not verify that this driver actually works but we assume it does. If you successfully use this driver with macOS Sierra, please let us know.

In any case please review the note on the required user approval under macOS High Sierra.

Which USB serial adapter do I have?

There are various ways to try to find out what kind of USB serial adapters or what driver you are using.

1.

The easiest way, of course, would be if you would remember, or would find the driver's installer package ;-)

2.

If the adapter is connected to your Mac, the adapter's manufacturer as well as the chip set may be displayed in System Information (Apple menu -> About this Mac -> System Report...). Please check under Hardware / USB.

3.

The third option is to look for the installed driver. Typically the driver is located in /System/Library/Extensions.

If you find a file "FTDIUSBSerialDriver.kext", an FTDI driver is installed.
If you find a file "KeyspanUSAdriver.kext", a Keyspan driver is installed.
If you find a file "ProlificUsbSerial.kext", a Prolific driver is installed.

Depending on your driver's version, the kext file name may not be identical to this, but it should at least be similar.

Tip:

    If you have purchased direct from TKR before March 2008, you are likely using an adapter from Manhattan, which uses a Prolific chip.

    If you have purchased direct from TKR in March 2008 or later, you are likely using an adapter from DeLock or Digitus, both of which use an FTDI chip.





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