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Pavel Richter avatar image

Modbus TCP address 777 problem

modbus-problem.jpgGood day,I have a problem reading the charger current. 777 is listed in the modbus TCP address list, but venus reports an error.
Do you have any idea where the problem is?

Thank you

Modbus TCP
modbus-problem.jpg (344.0 KiB)
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What GX firmware are you using?


Is your MPPT at id 233? Normally it will be lower like 223.
3 Answers
matess4rs avatar image
matess4rs answered ·

Is reading of other modbus addresses working successfully? I have the same issue with the reading of addresses (3704,3705) related to trackers current on MPPT´s 450/100. It looks like some kind of FW issue. No MPPT tracker currents are possible to read on addresses listed in the register overview. Or at least I have not found any which would provide tracker current information.

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My 450/100 is at ID 100 which is strange but I can read 771-777 and 3700-3705 without any problems. But current always returns 0.

450/100 firmware v1.05
GX firmware v2.80~16-large-21

Hi Shaneyake, correct, 3704,3705 returns 0. But I have two 450/100, so as described in the register list, 777 is not available for multiple VE.can systems. Voltage readings on 3700,3701 are without problems. I´m running FW 2.73 on Cerbo and v1.05 on MPPT´s.

Now I tried v2.80-29 on Cerbo, and getting error on asking for registers 3704, 3705 1638310710483.png

1638310710483.png (35.7 KiB)
Pavel Richter avatar image
Pavel Richter answered ·

Hi

Yes. the address is 233 and 235.
I use octo GX and these IDs are also written in the list. directly in GX.
The FW version is 2.80 -21-large-23.

It is strange that reading other values goes without problems.

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seriusrod avatar image
seriusrod answered ·

Same result here. 150/85 mppt at Id 223. Requesting from 776 onwards throws an error bc 777.
I don't know if PV Current shouldn't be available or if that's an error. I suppose that is difficult to manage adding new registers.

@mvader (Victron Energy) shouldn't be possible to add empty "placeholders" to those isolated "holes" in the register list? That way one could request the required complete list in one row and avoid using several connections and simultaneous requests. I think that's bad for the system.

For getting the complete com.victronenergy.system, you need 7 connections/requests (and gridLossAlarm is also broken)

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