From: ian <ian>
Date: Thu, 1 Dec 2005 00:26:54 +0000 (+0000)
Subject: note which way round polarity is for detection
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ijackson/git?a=commitdiff_plain;h=611485542c456f6f6105274886306f520b6d3f89;p=trains.git

note which way round polarity is for detection
---

diff --git a/cebpic/README.circuitry b/cebpic/README.circuitry
index d5b07a6..e96cd5e 100644
--- a/cebpic/README.circuitry
+++ b/cebpic/README.circuitry
@@ -32,9 +32,12 @@ If the following conditions are true, the track will be
 supplied with power:
 	* Shutdown is L
 	* The overcurrent cutout permits
-The polarity of the power is controlled by the Direction pin.  (There
+
+The polarity of the power is controlled by the Direction pin.  There
 is no need to specify which polarity is which, as this is not
-meaningful in NMRA DCC.)
+meaningful in NMRA DCC.  However, for debugging it is useful to know
+that for block sense to be effective on unreversed segments, the
+direction output from the PIC should be L.
 
 Booster Overload Cutout and Shutdown
 ------------------------------------