request for clarification re. user manual errata corrige

4 years 10 months ago #29531564 by LROBBINS
When I originally wired my system, I used an SPDT relay controlled by a supervisor MCU to turn an HDC2450 on and off - grounding yellow to black for OFF, and connecting yellow to B+ for ON. I now have two newer HDC2450 and have seen this note:

P. 24, Fig. 2, Note 1:

Power control and ground connection will only be used as the controller on/off switch. Applying voltage on this line will no longer power on the controller. Some controllers already out in the field will not apply, but all recent purchases made from Roboteq as of 10/2/15 will have this change in effect.


I gather that this means that the yellow lead should be connected to black (ground) for OFF, and LEFT FLOATING for ON. Two questions: (1) is my interpretation correct? and (2) will harm be done by having the relay connect the yellow wire to B+ rather than floating, or should I dig into my circuit boards to remove that trace?

BTW: don't you think it's about time to issue a revised User's Manual? There have been a number of enhancements since the current version, and there also remain a number of erroneous or misleading paragraphs (you might do a search on these forums to find some).

Ciao,
Lenny

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4 years 10 months ago #29531568 by niko
On the hdc2450, pulling the power control to VBat is the same as floating the wire. The controller will be on.

The only thing you need to do is ground for power off.

We are working on updating the manual.

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4 years 10 months ago #29531571 by LROBBINS
Thanks for the quick response. I take it that Fig. 1 on p. 22 remains an accurate description for the HDC2450. Ciao, Lenny

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