tapping rs485

F

Fritz Oppliger

Guest
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.

--
Fritz Oppliger
 
"Fritz Oppliger" <invalid@nospam.biz> wrote in message
news:1105727636.ec2303ceacb39978cc292b1f0f0f0ab0@teranews...
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.

--
Fritz Oppliger
Use both comparitors in an LM393.
 

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