🚀 go-pugleaf

I would like to send very small  messages  over a serial line at 187.5
kbps using V25 hardware  (alias  current-loop,  alias RS-485) (I don't
have control over the target device specs).

I have a half-working  prototype that is a regular serial port where I
replaced  the crystal  (1.8 Mhz) by a 3.0 MHz  version,  (this  should
increase  the max speed from 115.200 to 187.500) and I added a special
V25 line  driver  chip  after the  regular  V24 output (as I only need
output) (I assume the output can drive a TTL input circuit).

The bytes are  received  at the other end, but very  unreliably  (some
values are never received, some after sending them twice).

I replaced the clock circuit by a 3.0 MHz  oscillator  circuit,  which
didn't change anything, so I assume the problem is that the UART can't
follow that speed.

Could  someone point me to a complete  solution  (V25 card  supporting
187.5 kbps) or a regular  serial line card with a  replacable  crystal
and a UART supporting the 3.0 MHz clock and the high baud rate ?

Thanks in advance.
--
Stef Van Vlierberghe.
-- 
Stef VAN VLIERBERGHE            Eurocontrol - Central Flow Management Unit
stef@cfmu.eurocontrol.be        Avenue des Arts 19H
Tel: +32 2 729 33 42            B-1040 BRUSSELS
Fax: +32 2 729 32 16            Belgium