[svlug] Bar code reader

William R Ward bill at wards.net
Tue Jul 1 18:44:46 PDT 2003

Rick Schultz writes:
>On Tue, Jul 01, 2003 at 02:53:28PM -0700, William R Ward wrote:
>> it uses RS-232 at TTL voltages, so it just needs a 1488/1489 circuit
>> or the modern equivalent.
>Does it?
>The lirc receiver circuit (cf. my last message) outputs 0-5V, and it's
>meant to plug into a serial port.  The page says:
>    "It should be noted that the circuit described above does not fully
>    comply to the RS232 standard as latter demands a voltage swing of at
>    least -3V/3V for the signals. This circuit will provide
>    approximately 0V/5V which the majority of serial ports will also
>    accept."

Interesting...  maybe I should just plug it in and cross my fingers...

William R Ward            bill at wards.net          http://www.wards.net/~bill/
"A foolish consistency is the hobgoblin of little minds, adored by
 little statesmen and philosophers and divines."        - Emerson

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