8 FAQ & SUPPORT
If no communication is seen or bad data is displayed, please refer to the FAQs below which cover the
most common configuration problems.
Configuration
Is the unit sending data with RS422 or RS232?
The motion sensor is always on and sends data over the RS232 and RS422 channels simultaneously.
The IMU sensor junction boxes are dispatched pre-configured for either RS422 or RS232.
Check the wiring as per the Electrical configuration guide to see which output is being used.
Data is being received but is either seen as bad data or wrong data.
Check which format your sensor has been configured with or contact SMC quoting the units serial
number for confirmation.
When applying a setting change in the SMC IMU Configuration Software the output signals can
display bad data.
This occurs during the automatic restart of the sensor unit, the values will settle after a few minutes.
Data that is being received is missing data or freezing. First check if the Output Rate is set too high for
the configured output string and baud rate. Details are supplied in Section 5.2 for each protocol.
Also check the Serial port, if using a Serial to USB adapter, use a high quality adapter. Contact SMC
for advice.
Parameters changed in the Configuration software are not being set in the IMU.
If after pressing the set button the parameters set in the IMU are not changing, check if the IMU
serial number and software version is displayed in the configuration software.
If not, press the Read Settings button. If the data is still not showing this is typically due to the lack of
two way communication to the IMU. The Receive data lines are connected but not the Transmit data
lines. Check the wiring through to the IMU.
Are the cables connected correctly?
No Communication with the IMU
Check the cable connection and disconnect and reconnect is necessary.
Is the sensor powered up? Voltage should be 9 to 30 VDC
Check what Baud Rate and Output Rate should be used or has been set up. Use the Search IMU
button to scan all available ports.
The default baud rate set when the unit is shipped from SMC is 115200 and the standard output rate
is set to 100Hz. (note for SMCems software the IMU output rate should be 10Hz).
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