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

Well, just in case...I wired a switched connector. That found no communication: denis@denis-ThinkPad-L420:~$ sigrok-cli --driver mastech-mas345:conn=/dev/ttyUSB0 --samples 10 sr: serial: Didn't find a valid packet (read 0 bytes). No devices found. For completeness, here are the interface

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

On Sat, Dec 16, 2017 at 3:48 PM, Denis Heidtmann wrote: > Yes, Russell, I thought of that. I first need to install the driver for > the usb-serial device, recall how I did that on the laptop, and try to do > it the same way. But I will pursue that when I get access to

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

Denis, In Unix-manpage-speak, [] around something means it's optional. Regards, NealS ___ PLUG mailing list PLUG@pdxlinux.org http://lists.pdxlinux.org/mailman/listinfo/plug

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

>From man stty: [-]parenb generate parity bit in output and expect parity bit in input [-]parodd set odd parity (or even parity with '-') I thought the "-" preceded every control; not meaning negative. Your interpretation makes more sense. The parodd entry

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

Denis, I believe "-parenb" means no parity, as shown in your stty -a output, looks good to me. I'm just guessing, not having anything serial or scope-ial to hook up to my linux box at the moment. The cooked/raw/echo/xyzzy settings are way beyond my scope of experience. NealS

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

Galen, thanks for the Clinic offer, but I will not be able to make it there. Since my last report I have set the baud rate and bits: denis@denis-ThinkPad-L420:~$ stty -F/dev/ttyUSB0 -a speed 600 baud; rows 0; columns 0; line = 0; intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = ;

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

On 12/14/17 21:24, Denis Heidtmann wrote: > Measuring with a 'scope with the laptop issuing the command sigrok-cli > --driver mastech-mas345:conn=/dev/ttyUSB0 --samples 10: > > triggering on DTR > > DTR goes from -6.6V to +7.6V and remains there 'till 9.64s > RX goes from -2.6V to +6.4V for

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

Measuring with a 'scope with the laptop issuing the command sigrok-cli --driver mastech-mas345:conn=/dev/ttyUSB0 --samples 10: triggering on DTR DTR goes from -6.6V to +7.6V and remains there 'till 9.64s RX goes from -2.6V to +6.4V for .48s then again at 2.6s,3.12s, etc 'till 7.32s (10 groups

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

The optocouplers in the dmm are reportedly TLV817B. The emitter resistor on the output npn is shown on the schematic to be 1.5K. I measured it to be 7.35K. The input resistor in series with the LED is listed as 3.3K. I have not opened the dmm to see if the schematic is accurate. I agree that

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

On 12/13/17 23:03, Russell Senior wrote: > The precise levels are not supposed to make a difference. Below a > negative threshold and above a positive threshold should be enough. > From memory, original RS232 was +/- 12V, but any remotely modern PC > would use +/- 5V-ish. And the reality is that

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

To step back a bit I fabricated a little fixture to make it convenient to test the lines going into the dmm. I found a description of those lines: 5-pin inline connector. pin 1 Gnd pin 2 TX pin 3 RTS (must be off) pin 4 DTR (must be on) pin 5 RX The connections are through optical couplers in

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

On Mon, Dec 11, 2017 at 11:21 AM, Denis Heidtmann wrote: > Is it possible that your command /dev/ttyUSB0 600,cs7,cstopb,-parenb has an > error? Not only possible, but likely. > I executed stty 600 then stty -a : > denis@denis-ThinkPad-L420:~$ stty -a > speed 600 baud;

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

Is it possible that your command /dev/ttyUSB0 600,cs7,cstopb,-parenb has an error? I executed stty 600 then stty -a : denis@denis-ThinkPad-L420:~$ stty -a speed 600 baud; rows 24; columns 80; line = 0; intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = ; eol2 = ; swtch = ; start = ^Q;

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

Tried it. No response. Not sure how I got back to a functioning terminal, but now: denis@denis-ThinkPad-L420:~$ sigrok-cli --driver mastech-mas345:conn=/dev/ttyUSB0 --scan sr: serial: Error opening port (16): Device or resource busy. denis@denis-ThinkPad-L420:~$ On Sun, Dec 10, 2017 at 11:32

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

The signaling on a PC RS232 line is +nV and -nV, where n is somewhere between 5 and 12, inclusive. So, I think -6V would be a zero and a +6V would be a one. I think you can use GNU screen here, with the following options (serial parameters are from the manpage from stty(1): screen

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

I notice that 12 V is mentioned. I measure ~6 V from ground to every pin except RxD, which is zero. (All DC; when not sending data.) Could this be the issue? On Sun, Dec 10, 2017 at 6:28 PM, Denis Heidtmann wrote: > Here is the protocol description I recall finding:

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

Here is the protocol description I recall finding: MAS345: data format: 7n2 at 600 baud (7 bits, no parity, 2 stop bits). Control lines: DTR and RTS lines are used to power the TX line: RTS is clear for -12 supply; DTR is set for +12 supply. Data transmission is solicited sending

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

The protocol I recall seeing documented was 7n2, 600 baud. I must confess I do not know how to talk directly over serial. I tried Google, but there were too many options and opinions. What do you recommend for this simple task? On Sun, Dec 10, 2017 at 3:01 PM, Russell Senior

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

Try talking to the DMM directly over serial. The protocol description says: Various multimeters from Metex (and rebadged ones) use this common 14-byte packet based ASCII protocol. The actual multimeter ICs in the devices have different names (e.g. "MASTECH M343-01" or "Metex KS57C2016") but

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

Thanks for the -help. I got part of that -help when I entered an incorrect option, but somehow missed the -- entries at the end. Here is what I get: denis@denis-ThinkPad-L420:~$ sigrok-cli --driver mastech-mas345:conn=/dev/ttyUSB0 --scan The following devices were found: mastech-mas345 -

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

russell@vanhorn:~$ sigrok-cli --help Usage: sigrok-cli [OPTION...] Help Options: -h, --help Show help options Application Options: -V, --version Show version and support list -l, --loglevel Set loglevel (5 is

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

The Fluke example certainly sends the data to the screen. The example the sigrok site gave (sigrok-cli --driver mastech-mas345:conn=/dev/ttyUSB0 --samples 10) has --samples 10 tacked on. It is not clear to me which sw reads that. I tried changing that to other stuff but I just get sigrok help

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

https://www.youtube.com/watch?v=TWwuiIfq_Z4 On Sat, Dec 9, 2017 at 6:19 PM, Russell Senior wrote: > I don't actually know what sigrok does, but I would naively expect it > to blurt data out onto the screen. Time to go looking for helpful > youtube videos. > > On Sat,

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

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

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

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

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

Is the USB-RS232 adapter known to work? Several years back I had a no-name adapter. Couldn't get it to work. Found out it had a fake Prolific chip in it. No wonder it had such an attractive price. Try looping it back to itself and see if it works before you go too far down a rabbit hole.

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

I did as suggested with the lsusb/dmesg. It looks to me that the adapter is detected but the presence of the DMM into the adapter is not sensed. Agree? Maybe it does not matter. Just proceed as if the DMM is seen? denis@denis-ThinkPad-L420:~$ lsusb Bus 002 Device 003: ID 5986:03b4 Acer, Inc

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

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

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

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 wrote: > here is the link: > > https://sigrok.org/wiki/Multimeter_ICs#Metex_14-byte_ASCII > > I would need to study

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

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 wrote: > I have found this: > Protocol > > The protocol is

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

It looks like it speaks the same protocol as the MAS345 which is supported by Sigrok if you want to just use it under Linux. https://sigrok.org/wiki/MASTECH_MAS345 On Wed, Dec 6, 2017 at 2:34 PM Russell Senior wrote: > I guess we should establish what you want to use

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

I guess we should establish what you want to use this for? I may be presuming wrongly. My bias is usually towards capture into handy formats I can manipulate easily with unix shell tools. Maybe that's not at all what you want to do. On Wed, Dec 6, 2017 at 2:29 PM, Denis Heidtmann