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My question seems simple but i can't find the answer on documentation. (or I don’t have enough skillz)

I have this energy meter with pulse output: https://cdn.store-factory.com/www.compteur-energie.com/media/Ketler-KE3205-45A-MID-compteur-energie.pdf The doc says: EN 62 053-31. (Tension 12-27V DC/ courant <27mA) Each pulse duration is 30 ms

My inputs are on a LT-22222 from dragino: https://www.dragino.com/downloads/downloads/LT_LoRa_IO_Controller/LT22222-L/LoRa_IO_Controller_UserManual_v1.5.5.pdf the doc says: The DI port of LT-22222-L can support NPN or PNP output sensor. More info page 34. I have make those input works with a simple 24 V generator.

My question is: Can they work together?

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  • \$\begingroup\$ Digital Input ( Detect Low signal , Max, 6V) Yes if you scale to this range \$\endgroup\$
    – D.A.S.
    Commented Aug 12, 2021 at 22:22
  • \$\begingroup\$ according to page 34, the doc says that i can input 24v. I dont really understand ... (exemple 2) "Example2: Connect to a High active sensor. This type of sensor will output a high signal (example 24v) when active. " If i understand, you read for LT-33222. Mine are LT-22222:Interface for Model: LT22222-L: ➢ 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor). I dont really understand if, LT-22222 can detect 30ms pulse. \$\endgroup\$
    – user3178486
    Commented Aug 12, 2021 at 23:33
  • \$\begingroup\$ i am also interested in why my question was downvoted :(... i am sorry if i did something wrong. Can you explain ? \$\endgroup\$
    – user3178486
    Commented Aug 12, 2021 at 23:47
  • \$\begingroup\$ I don’t know , maybe you can find better manuals or specs on measurements for this \$\endgroup\$
    – D.A.S.
    Commented Aug 12, 2021 at 23:51
  • \$\begingroup\$ Downvotes are applied when questions "do now show research effort; are unclear or not useful" - in this case my guess is 'unclear.' \$\endgroup\$
    – JYelton
    Commented Aug 12, 2021 at 23:51

1 Answer 1

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IF your deice is a LT22222-L then

Interface for Model: LT22222-L: then page 7 of the data sheet says the two inputs can withstand up to 50V directly.

➢ 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, ...
➢ 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
➢ 2 x Relay Output (5A@250VAC / 30VDC)
➢ 2 x 0~20mA Analog Input (res:0.01mA)
➢ 2 x 0~30V Analog Input (res:0.01v)
➢ Power Input 7~ 24V

In the data sheet

Page 34 shows how to connect inputs.

Page 23 shows how to set minimum trigger length

AT+TRIG2 1,10

= Set channel to input triggering on rising edge, with 10 ms minimum pulse.

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  • \$\begingroup\$ Thx, my doubt is about the "duration of the pulse": 30ms. Is is short ? or ok to detect ? \$\endgroup\$
    – user3178486
    Commented Aug 13, 2021 at 5:24
  • \$\begingroup\$ With simple 24v generator, the inputs WORKS !!! My Doubt are with 24V PULSE of 30MS ! \$\endgroup\$
    – user3178486
    Commented Aug 13, 2021 at 5:29
  • \$\begingroup\$ Ok, i missed that.. dont know how but this is ok. All things works now. thx you. \$\endgroup\$
    – user3178486
    Commented Aug 13, 2021 at 19:39

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