[1000mp] FT1000mp serial port communication

[Pete Smith]

Just a side-note - this is often true of parallel ports, too, particularly add-in's.  Logic 1 may be 5 volts, or it may be 3.3.  I had an add-in port that wouldn't work with one of my band decoders, because of this difference.

Since both hardware serial and parallel ports are on the way out, it would be interesting to know if USB adapters powered from the motherboard are standardized on 5 or 3.3 volts, and if they deliver whatever maximum voltage the motherboard gives them to the serial output.

73, Pete N4ZR

73At 09:45 AM 5/14/2006, you wrote:
>I had a problem communicating between my laptop and my Mark V serial port. I
>checked everything - the laptop worked fine with everything else, the cables
>were fine, all the pini outs were right, etcetra. Turns out these radios
>require an unusually high serial signal input level, and my laptop, although
>it works fine with everything else, just wasn't shouting loud enough to get
>any response from the rig. I switched to an old tower computer and the rig
>talks to it fine, never a problem.
>
>Perhaps your home brew serial port is just 'on the edge' of your rig's
>signal level requirement. If it is, the only fix is a different (higher
>output) serial port.
>
>I remember muttering what about the RS232 standard, and being advised that
>it is often referred to as the RS232 non-standard...
>
>Just a thought
>
>Robert Murray    VA7RMM
>RR1 S5 C16
>Edgewood, BC    V0G 1J0
>Phone/Fax (250) 269-7698
> 
>
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