OK, I tried putty with 2 & 3 tied together and it loops back and shows
keystrokes while tied. So the NUC's RS232 port IS functional.
I found an FTDI USB RS232 but it ends in female pins, I need male.
Found a knockoff PL2303 USB-to-DB9 cable, I hope it's RS232 level, it
does end in a DB9. No luck there either. Same "Modbus timed out" error.
There is an isolated RS232-Modbus bridge there in between. I know it
works because it's fine with the existing Dell and 2.7. I did speculate
if the electrical signal levels are somehow different it might not work
on the new machine, but that doesn't make much sense.
I guess I need to bring the oscilloscope out- if the baud rate is wrong,
that would do it, but I don't see how 2.8 would change that. Same
code. But I'm running out of other things to check.
Danny
On 4/10/2022 1:19 PM, andy pugh wrote:
On Sun, 10 Apr 2022 at 18:29, Danny Miller <dan...@austin.rr.com> wrote:
Nothing to unplug- it's a built-in RS232 DB9. Nothing enumerates across it.
https://superuser.com/questions/131044/how-do-i-know-which-dev-ttys-is-my-serial-port
suggests "cat /proc/tty/driver/serial" will tell you which ttyS* has
hardware in it.
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