Xbus FAQ

1. General Topics
   • Is the Xbus system compatible with the MT9 SDK?
   
   
2. Communication Topics
   • Why can't the MT9 software detect my Xbus Master using the serial cable?
   • Why can't the MT9 software detect my Xbus Master using Bluetooth?
   • Why can't the MT9 software detect my Xbus Master using the serial cable? I am using a USB<>RS-232 converter to connect to the host.
   • Why does the Xbus Master shut itself off automatically after I turned it on?
   • My Xbus Master is set into Bluetooth mode but the previously connected Bluetooth device is unavailable. How can I use the MT9 software to reset the Xbus Master settings?
   • I am using my own serial cable software. Why can't I read any data?
   • What is the "Advanced" option in the Xbus Master Settings?
   • Why do I hear a beep in the middle of my measurement?
   • What Bluetooth devices does the Xbus Master support (interoperability)?
   
   

General Topics

Is the Xbus system compatible with the MT9 SDK?

Yes, both the MT9 Software and the SDK fully supports the Xbus system, making it easy for you to develop your own application using multiple MT9's with the Xbus system.

Communication Topics

Why can't the MT9 software detect my Xbus Master using the serial cable?

First check if the Xbus Master is turned on (LED flashes). If the LED is solid the Xbus Master may be in Bluetooth mode. Restore to factory defaults to select serial cable mode. Check if the serial cable is correctly attached to the Xbus Master and the host. Use the twist-lock at the Xbus Master side to attach it properly. Make sure that the RS-232 (COM) port used by the Xbus Master is not used by other software installed on your computer, e.g. ActiveSync.

Why can't the MT9 software detect my Xbus Master using Bluetooth?

Is the Xbus Master set in Bluetooth mode? If not, use the MT9 software to enable Bluetooth mode. Check if the Xbus Master is turned on (LED flashes). If the LED is solid (on) for more than 10 seconds the Xbus Master could not connect to the remote Bluetooth device. Decrease the distance between the Bluetooth devices and ensure line-of-sight. To retry, turn the Xbus Master off and on again. If the LED still doesn't flash, check the host Bluetooth device and its driver software.

Why can't the MT9 software detect my Xbus Master using the serial cable? I am using a USB<>RS-232 converter to connect to the host.

Some converter drivers have an "auto RTS/CTS" flow control. Disable this option for proper communication with the Xbus Master.

Why does the Xbus Master shut itself off automatically after I turned it on?

If the Xbus Master detects no devices (e.g. MT9's) connected on the bus, it automatically turns itself off.

My Xbus Master is set into Bluetooth mode but the previously connected Bluetooth device is unavailable. How can I use the MT9 software to reset the Xbus Master settings?

Restore the factory default settings (Serial cable mode, 115k2 bps, 100Hz) and use the Xbus Master serial cable to connect to the host.

I am using my own serial cable software. Why can't I read any data?

First of all check if the Xbus Master is in serial cable mode. If you use your own cable you must use a null-modem cable with at least five conductors. The following signals must be connected TX, RX, GND, RTS and CTS of which the first two and the last two are crossed! To log data from the Xbus Master the RTS line (host side) must be active.

What is the "Advanced" option in the Xbus Master Settings?

If this option is selected the serial port output signals will also be active during Bluetooth connection. NOTE: you can only read from the serial port (log data) and use the sampling moment notification signal. You can not use the serial port to communicate with Xbus Master. If the Advanced option is selected the baudrate will always be 460k8 bps.

Why do I hear a beep in the middle of my measurement?

This is either the low battery warning or an error beep. Check signal LED for more information. If the LED is solid an error occurred (error on the Xbus). This may also occur if the sampling frequency is set too high!

What Bluetooth devices does the Xbus Master support (interoperability)?

The Xbus Master equipped with a Bluetooth® module has been successfully tested with the following products:

• TDK Bluetooth USB Adapter (installed software version 1.3.2.19)
• Belkin Bluetooth USB Adapter
• TDK Bluetooth PC Card (installed software version 1.3.2.19)
• MSI PC2PC Bluetooth Transceiver Key MS-6967 (installed software version 1.3.1)
• iPAQ PocketPC model 3870/3970/5455/4150

Xsens recommends to use one of these products to connect with the Xbus Master Bluetooth for maximum ease of use and performance. These products have been tested with the XM in house. Other products that are known from 3rd party testing to work correctly are:

• Anycom PC-card, Bluecard
• DLINK USB-dongle
• Brainboxes CF

However, most products compliant with Bluetooth v1.1, supporting "Serial Port Profile (SPP)" should be compatible with the XM but please note that other Bluetooth products may not be fully compliant although they claim to support Bluetooth version 1.1 including the serial port profile. Problems that could occur are connection failures or loss of data.