The "gold standard" for RS-232 levels is the 1489 -- once literally
every serial port had a 1488 and a 1489 handling driver and receiver
duties, respectively.
.... and while technically the levels are +3 to +15, and -3 to -15 with
any voltage between +3 and -3 being "undefined" the 1489 worked fine
with TTL levels.
... and I'd expect the Bluetooth adapter to be built right onto DE-9 or
DB-25, so the cable lengths should be really short.
-- Lynn
On 4/12/2013 3:30 PM, Don Wilhelm wrote:
Unfortunately, many PC type devices do not conform to true RS-232 levels
and speeds, and will work with some devices over short distances, but
fail on other devices that expect the minimum RS-232 switching voltages.
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