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newuhenewuhe Posts: 2 Recruit
my pc system is ubuntu14.04, ros version is indigo, and I used robotiq package to control my gripper using this command
rosrun robotiq_c_model_control CModelRtuNode.py /dev/ttyUSB0
however I received 
AttributeError: 'ModbusIOException' object has no attribute 'getRegister'
I checked and found the issue is caused by this line of comModbusRtu.py in /home/username/catkin_ws/src/robotiq/robotiq_modbus_rtu/
response = self.client.read_holding_registers(0x07D0, numRegs, unit=0x0009)
this line throws 'ModbusIOExcption'.

I don't understand why it happens, I check my usb port with 
dmesg | grep tty & lsusb
and get  
[2483608.973947] usb 1-13: FTDI USB Serial Device converter now attached to ttyUSB0
Bus 001 Device 005: ID 0403:6015 Future Technology Devices International, Ltd Bridge(I2C/SPI/UART/FIFO)
and the LED in gripper is always red, however when I connect the RS485 to usb cable of gripper to ur robot controller, the LED turns blue and I can control it using polyscope.

Can anybody help me figure the issuem, I'm really confused.


  • carlosjosergcarlosjoserg Tactile Sensor Beta Testers Posts: 37 Handy
    Hi @newuhe

    Saw your post on github as well.. did you make sure you have write access to the USB port?

    You can do it temporarily with something like:
    sudo chmod 777 /dev/ttyUSB0
    And you can add permanently with:
    sudo adduser YOUR_USER_NAME dialout

  • newuhenewuhe Posts: 2 Recruit
    I'm absolutely sure I've done all you mentioned.
  • carlosjosergcarlosjoserg Tactile Sensor Beta Testers Posts: 37 Handy
    Don't know what else it can be then. If you want, we can set a skype/hangout and try to figure out whats happening. Let me know.
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