Dear list members I am a very novice and inexperienced user and I apologize in advance for what may seem an abomination in the land of python and serial interfaces.
I need to drive a USB device (valve controller) which is operated by d2xx type ftdi driver. I installed python 2.6 and original PyUSB module http://bleyer.org/pyusb/ is it the same PyUSB that is discussed here? I ran an original short test script # import the PyUSB module import d2xx # list devices by description, returns tuple of attached devices description strings d = d2xx.listDevices(d2xx.OPEN_BY_DESCRIPTION) print d # list devices by serial, returns tuple of attached devices serial strings d = d2xx.listDevices() # implicit d2xx.OPEN_BY_SERIAL_NUMBER print d h = d2xx.open(0) print h # read eeprom print h.eeRead() # get queue status print h.getQueueStatus() # set RX/TX timeouts h.setTimeouts(1000,1000) # write bytes (serial mode) print h.write('Hello world!\r\n") # read bytes (serial mode) print h.read(5) it seems that my device is visible and here is the output IDLE 2.6 >>> ================================ RESTART ================================ >>> ('ValveLink8.2',) ('FTT6NW6D',) <FtobjType object at 0x01E8D160> {'useExtOsc': 68, 'ifAIsFifoTar7': 0, 'powerSaveEnable': 149, 'ifBIsFastSer7': 2, 'maxPower': 0, 'bSlowSlew': 0, 'invertTXD': 202, 'manufacturerId': 'FT', 'signature1': 0, 'signature2': -1, 'invertRI': 248, 'cSlowSlew': 1, 'ahSchmittInput': 3, 'dSchmittInput': 0, 'bRIIsTXDEN': 0, 'dIsVCP8': 2, 'ahDriveCurrent': 1, 'vendorId': 1027, 'invertDCD': 2, 'highDriveIOs': 59, 'usbVersionEnable': 1, 'pullDownEnableR': 30, 'endpointSize': 3, 'aRIIsTXDEN': 0, 'invertDSR': 18, 'cRIIsTXDEN': 0, 'bhSlowSlew': 253, 'alSchmittInput': 39, 'version': 2, 'serNumEnableR': 224, 'cSchmittInput': 30, 'ifBIsFastSer': 0, 'usbVersion': 512, 'serNumEnable5': 0, 'isoOut': 0, 'dDriveCurrent': 0, 'invertRTS': 2, 'serNumEnable8': 2, 'manufacturer': 'AutoMate Scientific', 'cDriveCurrent': 1, 'bDriveCurrent': 3, 'cIsVCP8': 19, 'rIsD2XX': 68, 'ifAIsFifoTar': 0, 'serNumEnable7': 176, 'remoteWakeup': 0, 'bhDriveCurrent': 0, 'cbus0': 23, 'cbus1': 253, 'cbus2': 1, 'cbus3': 232, 'cbus4': 45, 'bIsVCP8': 167, 'alSlowSlew': 245, 'ifAIsFastSer7': 0, 'usbVersion5': 0, 'isoInA': 199, 'isoInB': 18, 'aDriveCurrent': 39, 'bIsVCP7': 180, 'ifAIsFifo': 0, 'bIsVCP': 0, 'selfPowered': 1, 'pnp': 1, 'ahSlowSlew': 51, 'invertCTS': 40, 'alDriveCurrent': 0, 'pullDownEnable': 0, 'bhSchmittInput': 1, 'aSlowSlew': 200, 'invertDTR': 199, 'serNumEnable': 1, 'aIsHighCurrent': 0, 'pullDownEnable8': 133, 'pullDownEnable7': 0, 'pullDownEnable5': 0, 'blDriveCurrent': 23, 'ifAIsFastSer': 0, 'aIsVCP7': 48, 'bSchmittInput': 51, 'ifBIsFifo7': 167, 'aIsVCP8': 48, 'ifBIsFifo': 0, 'isoIn': 0, 'usbVersionEnable5': 0, 'dRIIsTXDEN': 0, 'productId': 54872, 'invertRXD': 133, 'description': 'ValveLink8.2', 'dSlowSlew': 0, 'bIsHighCurrent': 0, 'ifAIsFifo7': 0, 'aIsVCP': 0, 'blSchmittInput': 248, 'rev5': 0, 'ifBIsFifoTar7': 19, 'serialNumber': 'FTT6NW6D', 'blSlowSlew': 30, 'aSchmittInput': 245, 'isoOutA': 2, 'isoOutB': 248, 'ifBIsFifoTar': 0, 'rev4': 1 I also know the control chars that need to be sent to device to open and close the valves "\nFv\r" <- toggle valve v, so \nF1\r toggles valve 1 "\nC\r" <- gives the details on the valvelink system, such as the controller address "\nI\r" <- Turns off all valves I modified the script to have print h.write("\nF2\r") but nothing happens – the valves do not respond any help would be vastly appreciated Thanks!! Iov ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
