Do I need ZC?

[ikabod]

I have a [Ren T] connected to [Ren C] connected to [grinch]
do I need to worry about ZC for Ren C? Based on what I read on the wiki, Ren T will supply the ZC to Ren C.
So I don't need to these options:

* Option 1

ZC can be generated on the board, by connecting a 9VDC (unregulated and unfiltered) supply to pins #7,8 of the RS IN RJ45 socket. This input signal (green trace in picture below) is a pulsating signal, rising from 0V to 9V and back in time with the AC power line (100 or 120 times per second, depending on your locale). This signal is the normal output from the Ren-T or it can be created using this circuit.

* Option 2

ZC can be generated on the board, by connecting a 9VDC (unregulated and unfiltered) supply to The "ZC In" pin (#3) of JP3. This signal (green trace in picture below) can be created using a schematic like this circuit. With this option, you will need to install a 10K resistor in location R1 instead of R9.

* Option 3

ZC can be connected directly to the board, by connecting a ZC Signal (purple trace in picture below), to the "ZC" pin (#2) of JP3. With this option, you can remove R1, R9 and Q1.

[deplanche]

You'd be using option 1, just like me.

[RichF]

The Ren-T is supplying your ZC to the REN-C. Also if you have it cofigured to do so the Ren-T is also a RS-485 transmitter.