If it's just two PICs, Point-to-Point, proper RS232 will easilly work down 100m of junk Telephone or Burglar Alarm cable. It should have a range of about 1km without Repeaters (using decent screened Cable).
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If it's just two PICs, Point-to-Point, proper RS232 will easilly work down 100m of junk Telephone or Burglar Alarm cable. It should have a range of about 1km without Repeaters (using decent screened Cable).
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