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tapping rs485

F

Fritz Oppliger

Jan 1, 1970
0
Greetings
I am trying to eavesdrop on a RS485 system. Four wire, TX+ TX- RX+ RX- and
GND.
I want to hook up my monitoring device to the system such that I can read
what everyone is saying i.e. receive both TX and RX.
On an unbalanced system I do it with diodes. On this balanced setup I am
not sure how to rig it so that the original lines are not affected.
Thanks for any insights.
 
J

john jardine

Jan 1, 1970
0
Fritz Oppliger said:
Greetings
I am trying to eavesdrop on a RS485 system. Four wire, TX+ TX- RX+ RX- and
GND.
I want to hook up my monitoring device to the system such that I can read
what everyone is saying i.e. receive both TX and RX.
On an unbalanced system I do it with diodes. On this balanced setup I am
not sure how to rig it so that the original lines are not affected.
Thanks for any insights.

Use both comparitors in an LM393.
 
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