the ones I played with used the CH340 chipset:
https://sparks.gogo.co.nz/ch340.html
https://cdn.sparkfun.com/datasheets/Dev/Arduino/Other/CH340DS1.PDF
do you know what chipset it's using?
On Mon, 20 Aug 2018 at 11:32, Paul van den Bergen <
paul.vandenber...@gmail.com> wrote:
> Yeah, that's probably fine - but it's still something I'd look at for
> workarounds... that whole "connect then fail to interact" thing sounds
> familiar... it's waiting for something that never comes, or the return is
> swallowed by the USB serial chip...
>
>
> On Mon, 20 Aug 2018 at 10:47, cory seligman <coryms....@gmail.com> wrote:
>
>> Yes, I am using a USB serial dongle. It's a known reasonably good quality
>> brand that otherwise works fine interactively.
>>
>>
>>
>>
>>
>> On Mon, Aug 20, 2018 at 10:33 AM, Paul van den Bergen <
>> paul.vandenber...@gmail.com> wrote:
>>
>>> are you using a USB to Serial dongle? for some time now they've been a
>>> standardised SoC that apparently handles breaks poorly... so if the system
>>> is expecting a break...
>>>
>>> (found this out for Unify PABX and Cisco serial - in the latter case,
>>> dropping the speed to 2400 and holding down space bar for 15 seconds was
>>> enough to fake a break - go figure... weird )
>>>
>>>
>>> On Mon, 20 Aug 2018 at 10:29, cory seligman via luv-main <
>>> luv-main@luv.asn.au> wrote:
>>>
>>>> Hi All,
>>>>
>>>> I'm having some trouble making expect work.
>>>>
>>>> I need it to talk to some vintage equipment over usb serial, and I
>>>> think I'm getting hung up on opening the port.
>>>>
>>>> When the script runs, it just connects to the device and sits there. I
>>>> can drive it interactively, but it doesn't attempt to automate anything.
>>>>
>>>> Any ideas? Thanks.
>>>>
>>>> My expect script looks like this:
>>>>
>>>> #!/usr/bin/expect -f
>>>>
>>>> # device
>>>> set modem /dev/ttyUSB0
>>>>
>>>> # keep it open
>>>> exec sh -c "sleep 3 < $modem" &
>>>>
>>>> # serial port parameters
>>>> exec stty -F $modem 2400 raw -clocal -echo -istrip -hup
>>>>
>>>> # connect
>>>> send_user "connecting to $modem, exit with ~,\n"
>>>> spawn -open [open $modem w+]
>>>> interact {
>>>> ~, exit
>>>> ~~ {send "\034"}
>>>> }
>>>>
>>>> set force_conservative 1 ;# set to 1 to force conservative mode even if
>>>> ;# script wasn't run conservatively originally
>>>> if {$force_conservative} {
>>>> set send_slow {1 .1}
>>>> proc send {ignore arg} {
>>>> sleep .1
>>>> exp_send -s -- $arg
>>>> }
>>>> }
>>>>
>>>> set timeout -1
>>>> match_max 100000
>>>> send -- "\r"
>>>> send -- "\r"
>>>> expect ">"
>>>> send -- "p 7d91\r"
>>>> expect ">"
>>>> send -- "p b2ff\r"
>>>> expect ">"
>>>> send -- "h\r"
>>>> expect ">"
>>>> send -- "td\r"
>>>> expect "td\r
>>>> 18 215 12 24 33\r
>>>> >"
>>>> send -- "gd 215\r"
>>>> expect eof
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> luv-main mailing list
>>>> luv-main@luv.asn.au
>>>> https://lists.luv.asn.au/cgi-bin/mailman/listinfo/luv-main
>>>>
>>>
>>>
>>> --
>>> Dr Paul van den Bergen
>>>
>>>
>>
>
> --
> Dr Paul van den Bergen
>
>
--
Dr Paul van den Bergen
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