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akidder

1519 Posts
Posted - 13 Mar 2002 :  15:59:37  Show Profile  Email Poster
Q: Is RS-485 terminated on your systems?

No. You must provide proper termination yourself at the ends of your RS-485 network.

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Drew Kidder
ADS Technology Transfer

akidder

1519 Posts
Posted - 17 Sep 2002 :  17:51:11  Show Profile  Email Poster
Revisions D and later of the GC Plus include a jumper to add termination to the network. When you place a shunt across the header, it adds a 120 ohm terminator between the RS-485 RX+ and RX- pins.

On rev D GC Plus systems, the header is J20, a 0.100 inch Molex header. On rev F GC Plus systems, the terminator is J23, a two-pin 2mm header.

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Drew Kidder
ADS Technology Transfer

Edited by akidder 11-Jul-2003: Add information about rev F J23 and include image.
Edited by ljoy 27-Sep-2007: Deleted image.
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