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Subject: interface problem

Date: 09/11/02 at 10:21 PM
Posted by: rupeshacharya
E-mail: rupeshacharya@hotmail.com
Message Posted:

i am using 8870 to decode dtmf tone and interfacing with pc using printer port.The dtmf works well when i don't connect it to the printer prt cable.But when i connect printer port cable to dtmf decoder output the IC don't work
When i used the buffer between dtmf decoder and printer cable the printer port read all data as 1.
when i used optocoupler the port read all as 0
what's the problem and how can i solve it

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