thx Iohannes for looking into it.

what i do to test it:

in PD: [comport 3 9600] - [print]

in Arduino: in setup:Serial.begin(9600) in loop: Serial.println("z"); delay(3000);

more simple it cannot be, i thought.

using the serial monitor of the Arduino IDE the z's are printed.

Pd gives the RXerrors (10 of them).

when i unplug the cable there's no reaction from [comport].

when i do [close( the following 3 lines are printed:

[comport] ** ERROR ** couldn't reset params to DCB of device COM3

[comport] Couldn't reset old_timeouts for serial device [comport] closed COM3

IOhannes wrote:

note, that virtual serial-ports on the client are forwarded to network on the host, so no actual serial hardware is involved. it shouldn't make a difference for the client though.

i'm not sure what this should tell me. my reasoning is that when my virtual XP doesn't have this problem, it's the combination of [comport] & W10 at fault.

(the Arduino on it's own IDE works fine: driver and hardware are apparantly ok).

IOhannes wrote:

i just tested [comport] on a virtual W10 (running on a Debian host),

so your host is Debian, mine is W10. which tells what?

rolf

PS i installed a fresh copy of Pd-ext 43.4