FAQ

G7 does not connect to HumanHand on Linux

The current user usually lacks serial-port access. Identify the actual port, such as /dev/ttyUSB0 or /dev/ttyACM0, then run:

sudo chmod 666 /dev/ttyXXX

Replace /dev/ttyXXX with the real device. This change is temporary and may need to be repeated after reconnecting. For production, have an administrator configure a persistent udev rule.

G7 does not connect to HumanHand on Windows

Exit HumanHand completely. Right-click the shortcut or executable, choose Run as administrator, then select the serial port and reconnect.

Which serial settings should I use?

Select the correct hand and system-assigned COM port, set 921600 baud, and start acquisition. A “serial acquisition started” log message confirms the connection.

What does a red LED mean?

• Solid red: hardware fault, such as IMU self-test failure.
• Slow red flash: critical warning, such as a disconnected finger module.
• Fast red flash: warning, such as missing calibration data or calibration CRC failure.

Stop acquisition and inspect all modules and cables. If the problem persists after reconnecting, retain the log, an LED video, and the serial number for support.

When is calibration required?

Calibrate before the first display or recording session. Results persist across software restarts, and a normal reconnect usually does not require recalibration. Recalibrate for a new wearer, after sensor reassembly, or when motion is visibly offset.

Do both hands use the same coordinate system?

Not for all outputs. FSNH uses RFU for the left hand and LBU for the right hand. FNIM EMF and IMU data use RFU for both. See Coordinate Systems.

How do I identify the hand in UDP data?

Read header hand (same as SDK hh_sdk_hand()): 1 is left and 2 is right. Each packet holds that hand only. Use packet length or joint_count to tell wrist-relative (612 bytes / 21) from forearm-relative (640 bytes / 22). Two hands share one port; split caches on hand.

Can the glove be machine washed?

No. Remove all five fingertip modules, the controller, and the cover, then hand wash only the textile glove at no more than 30°C. See Cleaning and Disassembly.

What should I do if power is lost during an upgrade?

Do not repeatedly reconnect the device or try another firmware. Record the tool message, component, filename, and device state, then follow Firmware Upgrade Procedure and contact technical support.

Can I test finger movements without wearing the glove?

Test only after putting on the glove correctly and completing calibration. This ensures that each sensor is positioned correctly relative to the hand. Results obtained without wearing the glove do not accurately represent real-world performance and should not be used to evaluate the motion-capture performance or accuracy of the G7 glove.