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Topic: ModBus and Pulse Counter (Read 686 times) previous topic - next topic

jamgood96

This is probably a simple question, but I'm a noob with this... is it possible to monitor a pulse counter and a ModBus enabled sensor at the same time? I've got a WattNode that uses ModBus as well as a metrima gas meter that outputs pulses for kWh's consumed.

Thanks!

James

robtillaart


depends on the length of the pulses and the details of the sensor. sounds like doable.
Post more infor to get a better answer.

Do you have a datasheet of the sensor?
Specs of the MODbus?
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

jamgood96

#2
Mar 29, 2012, 11:41 pm Last Edit: Mar 29, 2012, 11:53 pm by jamgood96 Reason: 1
I can't find a datasheet on the sensor. Here's a link to it. It has two pulse outputs, but it doesn't specify much else

http://tctsolar.com/tctmetrima.htm

As for the ModBus, what type of specs would be helpful? It's a WattNode ModBus. It measures current, voltage, frequency, etc.

http://www.ccontrolsys.com/w/WattNode_Modbus

UPDATE:

Based on a spec sheet I found, the pulse outputs for the Metrima are "open collector" types and have specs as follows:

      Pulse duration 250 ms
      Max. voltage 30 V
      Max. current 20 mA

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