Our driver works with many touch screens, digitizers, pens and whiteboard type devices and operating systems in many system configuration and environments.

This document lists any known issues or configuration considerations.

General issues

Delta mode devices	Controllers that operate in what we refer to as “delta mode” are controllers whereby touch co-ordinates are not transmitted when touch is held steady in the same position. The UPDD Console device Lift off time setting should be disabled to reflect this mode of operation. Delta mode devices that do not have this set will find it difficult to calibrate as the calibration algorithm requires a touch duration of >750ms. Known controllers that operate in this mode are: Elo Touchsystems, Smartset 2216, USB Chengying, IR Touch, USB (Zaagtech touch controller)
Multi-touch devices in non Windows systems.	The vast majority of modern USB touchscreens are now multi-touch and therefore require a multi-touch driver to support them. The standard Windows 7,8 and 10 HID driver supports multi-touch devices but other OS may not. To overcome this issue in non Windows systems some touchscreen devices try to be clever and recognise when they are plugged into a non-Windows system and deliberately switch mode of operation to be that of a single touch 'mouse' like device so as to work in single touch mode. In this case, when UPDD is installed to support the device and queries its capabilities it discovers that it is a single touch mouse and acts accordingly! To overcome this problem we can extract the multi-touch configuration file from the device when plugged into a Windows system and embed it the driver so that it can revert the device back to working as a multi-touch device in non Windows systems.
USB stalls	We have discovered that some devices can stall when initialised and may need to be configured to bypass the initialisation process.

Hardware specific issues

These notes decribe know issues with certain touch hardware:

Baanto, Optical	It is our understanding that this device can be placed in Mac mode – we are unsure exactly what mode this is (some sort of single touch mode) but our driver requires that this device is running in multi-touch mode. The Apple Mac setting is in Baanto Dash board software.
Cocopar Y156UH7R	Monitor has an OSD option for MAC. With this enabled the device runs in single touch mode. Once disabled it is important is to turn monitor power off then power cycle computer so thie single touch mode is fully cleared.
CVTE	We embed HID Report Descriptors for touch devices that outout 38 and 62 byte touch packets but there is also a 64 byte device for which we do not have the HID RD and therefore the CVTE driver does not work. Ideally we would like a HID RD extracted from a Windows system for this device but in the meantime we have modified driver with manual HID definitions that does work available on request.
DMC DUS serial	When using this controller you may need the heartbeat set to keep the device alive. See RS232 settings. rs232.macro.keepalive.ms=2000 - set using upddutils set rs232.macro.keepalive.ms 2000. rs232.macro.keepalive=02 4C 02 04 00 02 4C 02 81 01 - set using upddutils set rs232.macro.keepalive "02 4C 02 04 00 02 4C 02 81 01" After setting these values you need to reload the driver or reboot the system. We can supply software with the above settings preset if required.
eGalax old Single Touch	The old eGalax single touch device (USB vendor id 0EEF, product id 0001) comes in a number of flavors, both HID and non-HID compatible. For HID compatible devices UPDD V6 will work automatically with the device. For non-HID we pre-configure the device and we have 3 configurations, one 5 byte touch data packet version and two different 6 byte data packet versions. It is important that the correct one is supplied when a non-hid device is in use.
ELO, APR 7000 series	This series is not supported by our drivers - USB vendor / product id 4E7/71,73,74. We do however support the APR 7010 series 4E7/7A device.
ELO, 2515 iTouch Plus, USB	This is not a HID compatible device and needs a special driver from ELO to support multitouch under Windows. With UPDD driver, we only support a single touch. This controller was superseded with 2521 iTouch Plus and offers full multitouch with UPDD.
Ilyama TF6537UHSC-B1AG	We have encountered this device on two occasions under MacOS. On one occasion the device showed USB hardware errors when plugged into the Mac. On another occasion, single touch worked fine with the native HID device but as soon as UPDD was loaded and requested the device enter multi-touch mode then no touch data was sent from the device. Currently UPDD v6 does not support this device.
iiyama, T2754MSC	When plugged into the latest macOS version, the touch screen used on this monitor refuses to send out touch data. We have customers on 10.14 that are OK, but later versions cause problems. We believe that whatever the mac PnP manager is sending out to the driver requesting device information, causes the touch interface to disable. This could be a deliberate decision or a bug in the touchscreen's firmware. By the time the OS hands control of this device to our driver, it is already in this non-working state. We tried for 2 days without success to coax this device to work in these later versions!
Multitou.ch MultiTaction	This device is not directly supported by the driver but can be utilized in Mac OS X via our gesture software (configured to receive co-ordinate data in from TUIO). A ‘dummy’ UPDD driver needs to be installed to allow our gesture software to work. You have to set the incoming TUIO port to that defined by the Multitou.ch software. We have also experimented with a modified gesture engine to interface directly with this device via the Cornerstone SDK which appeared to work well (albeit the development was not completely finished) as the TUIO interface worked equally well. The incoming TUIO data is associated with a specific display so can only be used to control one Mac OS X desktop.
Pisichen, 16 inch	Runs in single touch mode under macOS and ignores all USB requests to switch back into multi-touch mode!
PQLabs	PQlabs have various touch screen products, starting at G3 and, at the time of writing - May 2018, shipping G9. Some of the early versions of the PQlabs hardware are not-HID compatible and need a custom driver to work as supplied by PQlabs. PQlabs never shared the touch data format of the non-HID devices with us so we have never been able to support them with our drivers, therefore we can only support HID compatible versions. We believe these to be G5 and above. Unfortunately, it is our understanding that both non-hid and HID versions can share the same USB vendor and product id so it is difficult to distinguish which is which when connected to a system other than to know some work and some don’t. When a device does not work we can capture touch data to confirm if it is a non-hid compliant device. We have further discovered that some PQLabs devices can run in both 'non-hid' and 'HID' mode. A customer wanted to use UPDD to support the device in multi-touch mode in MacOS and installed UPDD and reported touch was not working. We ran our diagnostics procedure and could see the device was registered in the Mac as USB device 1EF1/0001 and the captured data was non-HID. Rebooting the system did not change the situation. However, physically unplugging and replugging the device resulted in the device switching to HID mode, USB device 1EF1/0057 (presenting a different HID descriptor to the system), and touch worked in multi-touch mode. We are unsure why a reboot did not give the same results but physically disconnecting did as our driver would be issuing the same USB requests (to switch to MT mode) in both cases. These are the files captured by are diagnostics program showing the switch from 0001 to 0057 USB devices:
Samsung Flip2 WM85R	The display itself has its own operating system with whiteboard functionality. You can connect multiple external sources and run them in separate windows on top of the display's own OS. An external OS, such as macOS starts its own window in full screen mode on the display. The touch-out port of the display is connected to the external system. Users have reported that when running an external video source (e.g. HDMI) in full screen mode on the display, you need to enable the monitor's onscreen menu for touch functionality to work. This menu is always visible for a few seconds when you start the display and hides automatically. You can re-enable it and it stays present until disabled. This menu allows you to change the current window mode (e.g. disable full screen mode) and to take screenshots of the currently active window. This is the built in functionality of the display's OS and not of the connected external system and you have to use the touch functionality of the display to interact with it. It would appear that only if this menu is enabled the touch signal is passed to the connected external system. The menu can be dragged to the corner of the display and reduced in size, which uses significantly less space on the display. In addition to the above, user reports that if the video from the external display (PiP (Picture in Picture) function) is not in fullscreen then the touch-out port works. If it is in full screen then external touch does not work.
Sharp devices	The old UPDD V5 driver worked well with these devices but V6 has been intermittent. In V6 there are various device settings to control some of the USB initialisation features and these values seem to be the best combination: disable_get_max_contacts: 1 disable_remote_wakeup: 0 disable_set_alt0: 1 disable_set_device_mode: 1
Slate Digital Raven	To connect an additional touch monitor to this device you will need a custom driver from us that supports the Slate touch screen and the touch screen on your touch monitor. The driver will then support both devices. Thereafter in the Raven software you will need to select the ‘Dual’ mode option during Raven startup. This is in the same dialog where you select the desired DAW.
Surface Hub 2	If used as an external monitor, it has been reported that the Surface Hub 2 only sends TouchBack through the USB when the Windows TeamsOS “Connect” application is active and foreground, not when using HDMI+USB or USB-C (contrary to documentation).
SiW/BOE touch chip controller	SiW / BOE manufacturer chips (SBC) that are used in touch screens. These chips contain software (firmware) that interacts with the host operating system at a low level. One such chip is used in the USB device with Vendor ID 29BD, product id 9302 and Vendor id 424F, product ID 9301 and give a low level USB inteface error 'Device not responding, error 0x02ed' when touched. To the end user touch just does not work :( This issue affects the following known devices: ASUS, BE24ECSBT, USB - 424F Viewsonic, TD2455 (BOE), USB - 424F - Viewsonic have a Windows firmware update tool to correct this issue. Dell, P2424HT, USB - 1FD2 - this has been addressed by Dell with a firmware update (version 7.7) in the chip HP, E24t G5, USB - 29BD
Wing Cool Touch	The driver supports many touch devices from this touch manufacturer and they have USB vendor id 27C0 and product ids 616,818,819,858,859,868 (there could be others). However, we are aware that in some instances, the devices that use the 859 chip stay in single touch mode, even though the driver sends the 'Windows' USB requests to switch to multi-touch mode. If the UPDD Test program shows single touch, then you are likely to be stuck in single touch mode. If you run UPDD diagnostics and open up the resultant .zip file and look at the captured data in updd.raw.txt and it is in the format '07 01 D4 26 9B 15 00' then this will confirm it's running in single touch. Known to be in use on: Pisichen, 16 inch, USB Prechen, 14.0" FHD/HRD, USB Prechen, 15.6" 1920x1080, USB ZSUS, PM14T-2K, USB
Zaagtech/Chengying	Some Zaagtech/Chengying multi-touch devices switches to single touch mouse mode in MacOS and will not switch back. Regarding the device with USB product code C021 earlier versions of the device were fixed single touch in MacOS but a later release introduced a 'forced multi-touch' switch that allows it to work in MT. The C031 controllers also work in multi-touch mode with UPDD. If the UPDD Test program shows single touch then you are likely to be stuck in single touch mode. If you run UPDD diagnostics and open up the resultant .zip file and look at the captured data in updd.raw.txt and it is in the format '03 01 59 12 99 38' then this will confirm its running in single touch. When in single touch mode, it appears that the device runs in delta mode meaning that it sends an initial data packet when touched, further data packets when the stylus is moving, and a final data packet when the stylus is removed. However, when holding a steady touch, no data is sent and the driver will automatically generate a 'pen up' based on device settings 'liftoff_time_ms', that by default is set to 500ms. With delta mode devices we recommend that liftoff_time_ms is disabled so that only a real lift off will generate a pen up. This setting can be disabled in the UPDD Console, device, liftoff time setting. Further, for calibration points to be accepted a touch must last >750ms, so with delta mode devices either the liftoff_time_ms setting must be disabled or be >750.

Known Hardware Issues

General issues

Hardware specific issues