>
>>   I want to serially communicate two pic16f628s, but the distance
>> between them is  long, i.e, more than 30 meter, do you know any
>> integrated cicuit for obtaining greater voltages-currents from
>> pic16f628 output pins (i.e., amplify)  and at the receiver side
>> convert it to the pic16f628 input level.
> use proper RS-232 level converters (e.g. max232) and decent cable and you
> should have no probems at that distance.

Actually, depending on data rate, I don't think there's any problem having
a PIC send serial data 30 meters. You may have a ground loop problem,
though. Optical isolation could help with that, or go to an EIA422 or
EIA485 bus. Typical chips for this are the MAX488 and similar.

Harold


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