[SOLVED] usb serial port emulation

Hello
I'm an Arch newbie. I just purchased an HP Neoware CA21 thin client, replaced the small DOM unit by a 1GB module, and installed Arch on it. I would like to use this device as a kind of data logger, 24x7 continuous operation.
The device I'm reading is an ADC connected via a USB port, which provides a CDC/ACM interface. When I plug it into the CA21 USB port, /dev/ttyACM0 does appear. Under Ubuntu on a normal PC the same happens but I find I can only use it via the usbserial driver, which provides serial port emulation for a USB device, creating /dev/ttyUSB0. That's because I can't get the java serial port interface rxtx to recognise a ttyACMn device, for reasons I don't understand and am still investigating.
So, I have a couple of newbie questions about Arch ...
1/ is there an equivalent to usbserial, ie a serial port emulation for USB ports?
2/ if not, or perhaps more correctly, how can my java app interface to ttyACM0? The Arduino crowd may know about this.
3/ I'm kind of assuming rxtx works under Arch - is that right?
Thanks for any help.
Andrew
Last edited by mistertransistor (2011-11-12 16:43:03)

Well, kind of solved. I found that
- adding the "options usbserial ..." line does not prevent ttyACM0 from appearing when the device is plugged in
- once ttyACM0 is there, no amount of "modprobe usbserial ..." will make ttyUSB0 appear
- however, if you "rmmod cdc-acm" and then "modprobe usbserial ..." you will get a ttyUSB0
Having figured that out, I got a test app reading the USB port with no problems. However my real app gave some odd 'Main class not found ...' error even though the exact same jarfile runs fine under Windows XP (you may be wondering why I develop there rather than under Ubuntu. Well, I have a dual-boot machine XP/Ubuntu and NetBeans runs *much* better under XP - quite puzzling). Eventually I solved this by creating a new NetBeans project/application and copying in the code from the existing one - a total mystery to me).
So now the device is in my garage collecting data from my seismograph. I'm writing to a USB stick, not sure about how long that will last but as I don't delete files much it's always writing in a new area and any given area gets very few write cycles.
This is marked SOLVED but I still have not found how to read ttyACM0 and I would like to do that.
Andrew

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SysB1 wrote:
Hi, I have an instrument which has a usb connection. When I connect it to a Windows 7 PC, it automatically picks up the driver and shows up as a "USB Serial Port (COM7) (Manufacturer is FTDI).
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However, the VI (which just sends a VISA command "*IDN?") gives me a time out error (0XBFF0015) or a device/resource not present error ( 0XBFFF0011). Attached is a screenshot of the VI.
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Thanks.
PS: I went through the process to create the VISA-USB driver, but that has some other issue, but I am trying to understand why this occurs. This device also has a GPIB port and when I use a USB-GPIB adapter, it works very well.
Look up the examples that ship with LabVIEW. What you have there isn't quite complete - for serial VISA. While GPIB will work great with what you have, serial VISA requires you to configure your serial port and is a little more complicated to read.
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[SOLVED] usb serial port emulation

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