question

jkrammer avatar image
jkrammer asked

Hallo! I try to read the firmware version from a MPPT 75/15 with command 3 using the Vi.direct (HEX) protokoll

I'm trying to read the firmware version from a mppt 75/15 via Vi.direct (hex). I' was trying the 3 command "App version" but I don't know what the data bites are. With the get command 7 it's clear using the register i.e 0xEDEC for battery temp, but how is this done with comamnd 3?


Get: :7D5ED00[checksum]\n is working for charger voltage

how is the syntax for command 3? :300 [checksum]\n is not working


thanks in advance


Juergen

VE.Direct
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1 Answer
jkrammer avatar image
jkrammer answered ·

some addition information...

I'm sending this:

:300000052

and get this as response:

:AA9ED00C505EB


:AD5ED00C605BE


:13741DC

maybe this is the firmware version information. In fact my fw version is 1.37 but ":1" ist the done response but how to interpret the rest? is DC the checksum and 3741 in little endian means 4137? what is the 4 then?

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VE.Direct protocol FAQ