bkc@image.soe.clarkson.edu (Brad Clements) (09/12/89)
I need to pass RS-232 data over an audio line of dubious quality. 300 baud is the minimum (and acceptable) speed of transmission. I was thinking of using a phase-lock-loop detector tacked onto an RS-232 line driver on the output end, and a RS-232 receiver and tone generator on the source end. This seems to work ok, except that the PLL circuit has a holding cap and doesn't drop the output line fast enough. I've heard of FSK chips, but don't know where to start. Can anyone recommend a simple chip set that would allow me to pass RS-232 over an audio line (not a phone line, actually a television intercom system). I only need one direction. Flow control will not be needed. I don't need a modem. This line will be carrying other audio signals at the same time. I'll be sending short (5 character) sequences that can be retransmitted if garbled by noise. Thanks Brad Clements Network engineer Clarkson University -- | Brad Clements bkc@omnigate.clarkson.edu bkc@clutx.bitnet | Network Engineer Clarkson University (315)268-2292