[PLUG] com port in guest to usb in host (virtual box)

Denis Heidtmann denis.heidtmann at gmail.com
Sun Dec 10 02:17:53 UTC 2017


The loop-back worked.  Running sigrok-cli --driver
mastech-mas345:conn=/dev/ttyUSB0 --samples 10 w/sudo produced the same
result as earlier--a 10 second silent delay.

Should the results, ascii according to the protocol, appear in the terminal
used to launch the command?

On Sat, Dec 9, 2017 at 5:14 PM, Russell Senior <russell at personaltelco.net>
wrote:

> Try loopback on your usb-serial adapter.  That is, connect pin 2 and
> pin 3 (tx and rx, or vice versa).  Then run something like:
>
>   screen /dev/ttyUSB0 115200
>
> and type some letters on the keyboard and see if they echo back at
> you.  If so, the serial cable is working.  If not, you might need a
> different serial cable.
>
> You can kill off the screen session with Ctrl-A k, or just yank the
> usb connector and screen will helpfully exit.
>
> Another thought, you might need to fix the permissions.  Often the
> usb-serial device file will be created owned by the dialout group.
>
>   ls -al /dev/ttyUSB*
>
> If your user isn't in the dialout group, then you might not be able to
> open it.  Trying it as root will test that theory.  To fix the group
> ownership in the future, try adding your user name to the dialout
> group in /etc/group.  You will need to log out and then back in before
> the change will take effect (unless there is a shortcut I don't know
> about).
>
>
> Russell
>
> On Sat, Dec 9, 2017 at 4:34 PM, Denis Heidtmann
> <denis.heidtmann at gmail.com> wrote:
> > Some progress.  I executed "sigrok-cli --driver
> > mastech-mas345:conn=/dev/ttyUSB0 --samples 10" forgetting that the meter
> > was not plugged into the adapter--got "sr: serial: Didn't find a valid
> > packet (read 0 bytes).
> > No devices found."  Plugged in the meter, then got no response, but
> exactly
> > 10 seconds delay 'till the prompt returned.  And the default data rate is
> > 1/sec.  So it seems something was listening for the 10 samples.  But if
> the
> > samples were acquired I do not know where they went.  I was expecting
> they
> > would appear in the terminal.
> >
> > Clues?
> >
> > -Denis
> >
> > On Wed, Dec 6, 2017 at 11:25 PM, Russell Senior <
> russell at personaltelco.net>
> > wrote:
> >
> >> There is an example on the wiki page:
> >>
> >>   https://sigrok.org/wiki/MASTECH_MAS345
> >>
> >> that says:
> >>
> >>   sigrok-cli --driver mastech-mas345:conn=/dev/ttyUSB0 --samples 10
> >>
> >> I would try that.  That might or might not be the right serial device
> >> (i.e. ttyUSB0)... check dmesg, unplug/replug your cable and check
> >> again, if necessary.
> >>
> >> On Wed, Dec 6, 2017 at 9:14 PM, Denis Heidtmann
> >> <denis.heidtmann at gmail.com> wrote:
> >> > I agree completely.  I have downloaded sigrok-cli.  Now I have to try
> to
> >> > understand how to use it.  (I feel a bit overwhelmed.)
> >> > Where do I put the driver? Is output/input with respect to the
> external
> >> > device or the software?  I assume the device, judging by the longer
> list
> >> of
> >> > output formats.  What is the protocol?  Do  I need to know, or will
> the
> >> > driver decide?
> >> >
> >> > sigrok-cli -V
> >> > sigrok-cli 0.5.0
> >> >
> >> > Using libsigrok 0.3.0 (lib version 2:0:0).
> >> > Using libsigrokdecode 0.3.0 (lib version 2:0:0).
> >> >
> >> > Supported hardware drivers:
> >> >  .
> >> > .
> >> > .
> >> >   mastech-mas345       MASTECH MAS345
> >> >  .
> >> > .
> >> > .
> >> > Supported input formats:
> >> >   binary               Raw binary
> >> >   chronovu-la8         ChronoVu LA8
> >> >   csv                  Comma-separated values (CSV)
> >> >   vcd                  Value Change Dump
> >> >   wav                  WAV file
> >> >
> >> > Supported output formats:
> >> >   analog               Analog data
> >> >   ascii                ASCII
> >> >   binary               Raw binary
> >> >   bits                 Bits
> >> >   chronovu-la8         ChronoVu LA8
> >> >   csv                  Comma-separated values (CSV)
> >> >   gnuplot              Gnuplot
> >> >   hex                  Hexadecimal
> >> >   ols                  OpenBench Logic Sniffer
> >> >   vcd                  Value Change Dump (VCD)
> >> >
> >> > Supported protocol decoders:
> >> >   avr_isp              AVR In-System Programming
> >> >   can                  Controller Area Network
> >> >   dcf77                DCF77 time protocol
> >> >   ds1307               Dallas DS1307
> >> >   edid                 Extended Display Identification Data
> >> >   guess_bitrate        Guess bitrate/baudrate
> >> >   i2c                  Inter-Integrated Circuit
> >> >   i2cdemux             I²C demultiplexer
> >> >   i2cfilter            I²C filter
> >> >   i2s                  Integrated Interchip Sound
> >> >   ir_nec               IR NEC
> >> >   ir_rc5               IR RC-5
> >> >   jtag                 Joint Test Action Group (IEEE 1149.1)
> >> >   jtag_stm32           Joint Test Action Group / ST STM32
> >> >   lm75                 National LM75
> >> >   lpc                  Low-Pin-Count
> >> >   maxim_ds28ea00       Maxim DS28EA00 1-Wire digital thermometer
> >> >   midi                 Musical Instrument Digital Interface
> >> >   mlx90614             Melexis MLX90614
> >> >   mx25lxx05d           Macronix MX25Lxx05D
> >> >   mxc6225xu            MEMSIC MXC6225XU
> >> >   nunchuk              Nintendo Wii Nunchuk
> >> >   onewire_link         1-Wire serial communication bus (link layer)
> >> >   onewire_network      1-Wire serial communication bus (network layer)
> >> >   pan1321              Panasonic PAN1321
> >> >   parallel             Parallel sync bus
> >> >   rgb_led_spi          RGB LED string decoder (SPI)
> >> >   rtc8564              Epson RTC-8564 JE/NB
> >> >   sdcard_spi           Secure Digital card (SPI mode)
> >> >   spi                  Serial Peripheral Interface
> >> >   tlc5620              Texas Instruments TLC5620
> >> >   uart                 Universal Asynchronous Receiver/Transmitter
> >> >   usb_packet           Universal Serial Bus (LS/FS) packet
> >> >   usb_signalling       Universal Serial Bus (LS/FS) signalling
> >> >   xfp                  10 Gigabit Small Form Factor Pluggable Module
> >> (XFP)
> >> >   z80                  Zilog Z80 CPU
> >> >
> >> >
> >> > On Wed, Dec 6, 2017 at 3:17 PM, Russell Senior <
> >> russell at personaltelco.net>
> >> > wrote:
> >> >
> >> >> The sigrok route is probably a better investment of your time than a
> >> >> vendor-software horror show, imho.
> >> >>
> >> >> On Wed, Dec 6, 2017 at 3:02 PM, Denis Heidtmann
> >> >> <denis.heidtmann at gmail.com> wrote:
> >> >> > here is the link:
> >> >> >
> >> >> > https://sigrok.org/wiki/Multimeter_ICs#Metex_14-byte_ASCII
> >> >> >
> >> >> > I would need to study it and educate myself on how to make use of
> it.
> >> >> >
> >> >> > -Denis
> >> >> >
> >> >> > On Wed, Dec 6, 2017 at 2:29 PM, Denis Heidtmann <
> >> >> denis.heidtmann at gmail.com>
> >> >> > wrote:
> >> >> >
> >> >> >> I have found this:
> >> >> >> Protocol
> >> >> >>
> >> >> >> The protocol is (partially) documented in the vendor software's
> >> "Help"
> >> >> >> window (seems to apply to MAS343, MAS344, and MAS345; the M9803R
> >> >> protocol
> >> >> >> is different).
> >> >> >>
> >> >> >> See Multimeter_ICs#Metex_14-byte_ASCII for the DMM IC protocol.
> >> >> >>
> >> >> >> I looked in the software's help window, but with the sw I have
> there
> >> is
> >> >> no
> >> >> >> discussion of protocol.  Maybe the note above is referring to
> other
> >> >> >> software.  The MAS344 is not a current instrument.
> >> >> >>
> >> >> >>
> >> >> >> On Wed, Dec 6, 2017 at 2:15 PM, Russell Senior <
> >> >> russell at personaltelco.net>
> >> >> >> wrote:
> >> >> >>
> >> >> >>> Have you googled at all about the protocol?  You might be able to
> >> just
> >> >> >>> talk ASCII at it from Linux and get what you need.
> >> >> >>>
> >> >> >>> On Wed, Dec 6, 2017 at 1:22 PM, Denis Heidtmann
> >> >> >>> <denis.heidtmann at gmail.com> wrote:
> >> >> >>> > I want to use a DMM with a serial connection.  The sw for the
> DMM
> >> is
> >> >> for
> >> >> >>> > windows. It runs under Win2k (guest) on the desktop which has a
> >> >> serial
> >> >> >>> > port.   Is it possible to get it to run under Win2k (guest) on
> the
> >> >> >>> laptop
> >> >> >>> > which does not have a serial port?  I purchased a Sabrent usb
> to
> >> >> serial
> >> >> >>> > adapter that I hoped to use for this.
> >> >> >>> >
> >> >> >>> > I expect the problem is that I cannot get VB to pass the
> virtual
> >> com
> >> >> >>> port
> >> >> >>> > data from the guest to the usb port in the host (ubuntu).  If
> >> this is
> >> >> >>> > impossible or too difficult to be practical I will pursue
> linux sw
> >> >> for
> >> >> >>> the
> >> >> >>> > DMM, although I may run into a similar problem.  The DMM is
> >> Mastech
> >> >> >>> MAS-344.
> >> >> >>> >
> >> >> >>> > Thanks for any clues.
> >> >> >>> >
> >> >> >>> > -Denis
> >> >> >>> > _______________________________________________
> >> >> >>> > PLUG mailing list
> >> >> >>> > PLUG at pdxlinux.org
> >> >> >>> > http://lists.pdxlinux.org/mailman/listinfo/plug
> >> >> >>> _______________________________________________
> >> >> >>> PLUG mailing list
> >> >> >>> PLUG at pdxlinux.org
> >> >> >>> http://lists.pdxlinux.org/mailman/listinfo/plug
> >> >> >>>
> >> >> >>
> >> >> >>
> >> >> > _______________________________________________
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> >> >> > PLUG at pdxlinux.org
> >> >> > http://lists.pdxlinux.org/mailman/listinfo/plug
> >> >> _______________________________________________
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> >> >>
> >> > _______________________________________________
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