When using Q68 to QPC2 on a PC using Sernet, I have found it is the PC serial 
port that limits the serial port speed to 115200 Baud.
But Q68 to Q68 can achieve higher serial speeds.
Sernet requires RTS/CTS for flow control, which on the Q68 is pulled high and 
not available.
Pity the Sernet source code was not available so a software flow control could 
used like XON/XOFF.
But on saying all that Sernet does work on Q68 to QPC2, QXL. Not tried Atari ST 
QL emulator yet.
-------- Original message --------From: Peter Graf via Ql-Users 
<ql-users@lists.q-v-d.com> Date: 20/01/2018  11:19  (GMT+00:00) To: 
ql-us...@q-v-d.com Cc: Peter Graf <pg...@q40.de> Subject: Re: [Ql-Users] Q68 
Hi Fabrizio,

> Finally what is the theoretically max ser speed of the Q68 is?

460 kBaud for the hardware itself (UART and RS-232 driver). But for the
overall system, max. 115 kBaud is specified in the Manual. Beyond that
it has not been sufficiently tested.

Please note that many USB-SER converters for PC start getting unreliable
at 230 kBaud already.

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