[Elecraft] Bluetooth and Elecraft Rig Serial Comms

[Lynn W. Taylor, WB6UUT]

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.