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Endless data loop from dev/ttyUSB while sending AT commands

I have problem sending AT commands to my USB modem. At first I tried php-serial class, but when i was reading data, I got endless loop with strange data. Then I tried to debug problem and opened putty ...
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Can I get an 8-bit clean connection with 'socat'?

This question is mostly about "socat", but here's some background to go with it: I am trying -- for reasons having mostly to do with nostalgia -- to write a virtual modem driver for use with ...