Ich suche auf diesem Weg jemanden, der mir hilft, bei einem Growatt Mic Wechselrichter den Modbus auszulesen.
Modbus ist für mich absolutes Neuland.
Hintergedanken, ich möchte gerne die aktuelle Leistung des WR an eine Siemens Logo übertragen und auf einem Display anzeigen.
Um die Register des WR auszulesen habe ich mir einen USB RS485 Wandler besorgt.
Als Software habe ich qModMaster.
Und jetzt geht's bei mir nicht weiter, ab hier brauche ich Hilfe.
Via einem SerialSniffer habe ich das ShineBus Tool abgehorcht und habe herausgefunden dass die RS485 vom Growatt MIC komplett andere Daten ausgibt, und auch auf anderes antwortet, als es die verfügbare Doku sagt.
Wenn du inzwischen eine brauchbare Liste was davon was ist hast wäre es nett!
Heute programmiert, in Powershell, damit ich den Wechselrichter direkt auslesen kann anstatt via Cloud Umweg umd besser steuern zu können:
# Read Growatt MIC 500-3300 current wattage via Powershell and RS485 USB adapter.
# I simply don't like relying on cloud, and I want it faster than every five Minutes.
# Joachim Otahal April 2024
#
#$COM = [System.IO.Ports.SerialPort]::getportnames()
[string]$COM = "COM3"
[int]$Timeout = 4
# Modbus command for "give me your data"
[byte[]]$GetGrowattStatus=(0x01,0x04,0x0b,0xb8,0x00,0x7d,0xb2,0x2a)
$port = New-Object System.IO.Ports.SerialPort $COM,9600,None,8,one
$port.Open()
$port.Write($GetGrowattStatus,0,$GetGrowattStatus.Count)
# Response is not fast, but wait no more than $Timeout seconds
for ($i=0;$i -lt $Timeout*4;$i++) {
Start-Sleep -Milliseconds 250
if ($port.BytesToRead -gt 0) {
#Write-Verbose $i -Verbose
$Data=@()
while ($port.BytesToRead -gt 0) {
$Data += [byte]$port.ReadByte()
}
$GrowattWatt = ($Data[7] * 256 + $Data[8])/10
$i=[int]::MaxValue
}
}
$port.Close()
$GrowattWatt
# 7,8 = Watt aktuell, 15,16 Watt aktuell, 53,54 Frequenz, 55,56 = Volt, 79,80 = Volt
Das Modbus-log von der Statusanzeige des Shinebus als "Modbus view" - in der Hex Variante, was sich nicht so gut darstellen lässt, sieht man dass ein Teil der Antworten das Gerät als "String" ist, welche Wattstärke freigeschaltet ist, Seriennummer und so weiter:
Packet 64: MODBUS Request (packet size: 8, data size: 4), 2024-04-04 07:30:05,6238551 +0,0467421 Mode: RTU Address: 1 (Slave) Function: 3 (Read Holding Registers) Starting Address: 0 Number of Registers: 45 Parsed As: Address: 40000-40044 (45) CRC:34263 (OK) Packet 97: MODBUS Response (packet size: 95, data size: 91), 2024-04-04 07:30:05,8433831 +0,0000098 Mode: RTU Address: 1 (Slave) Function: 3 (Read Holding Registers) Parsed As: Register0: 1 Register1: 509 Register2: 0 Register3: 100 Register4: 0 Register5: 10000 Register6: 0 Register7: 20000 Register8: 1000 Register9: 18248 Register10: 12590 Register11: 12288 Register12: 23105 Register13: 16737 Register14: 94 ... CRC:33439 (OK) Packet 98: MODBUS Request (packet size: 8, data size: 4), 2024-04-04 07:30:05,8461831 +0,0028000 Mode: RTU Address: 1 (Slave) Function: 3 (Read Holding Registers) Starting Address: 45 Number of Registers: 45 Parsed As: Address: 40045-40089 (45) CRC:5598 (OK) Packet 131: MODBUS Response (packet size: 95, data size: 91), 2024-04-04 07:30:06,0479129 +0,0000118 Mode: RTU Address: 1 (Slave) Function: 3 (Read Holding Registers) Parsed As: Register0: 2024 Register1: 4 Register2: 4 Register3: 7 Register4: 29 Register5: 33 Register6: 4 Register7: 1840 Register8: 2875 Register9: 4750 Register10: 5150 Register11: 1035 Register12: 2875 Register13: 4750 Register14: 5150 ... CRC:51585 (OK) Packet 132: MODBUS Request (packet size: 8, data size: 4), 2024-04-04 07:30:06,0489403 +0,0010274 Mode: RTU Address: 1 (Slave) Function: 3 (Read Holding Registers) Starting Address: 90 Number of Registers: 45 Parsed As: Address: 40090-40134 (45) CRC:42436 (OK) Packet 165: MODBUS Response (packet size: 95, data size: 91), 2024-04-04 07:30:06,2494084 +0,0000071 Mode: RTU Address: 1 (Slave) Function: 3 (Read Holding Registers) Parsed As: Register0: 0 Register1: 5020 Register2: 50 Register3: 2369 Register4: 2461 Register5: 2231 Register6: 2139 Register7: 20 Register8: 5 Register9: 2415 Register10: 2300 Register11: 10000 Register12: 10000 Register13: 10000 Register14: 10000 ... CRC:55179 (OK) Packet 166: MODBUS Request (packet size: 8, data size: 4), 2024-04-04 07:30:06,2659701 +0,0165617 Mode: RTU Address: 1 (Slave) Function: 3 (Read Holding Registers) Starting Address: 23 Number of Registers: 5 Parsed As: Address: 40023-40027 (5) CRC:13773 (OK) Packet 179: MODBUS Response (packet size: 15, data size: 11), 2024-04-04 07:30:06,7818032 +0,0000069 Mode: RTU Address: 1 (Slave) Function: 3 (Read Holding Registers) Parsed As: Register0: 0 Register1: 0 Register2: 0 Register3: 0 Register4: 0 CRC:9398 (OK) Packet 180: MODBUS Request (packet size: 8, data size: 4), 2024-04-04 07:30:06,7910590 +0,0092558 Mode: RTU Address: 1 (Slave) Function: 3 (Read Holding Registers) Starting Address: 3001 Number of Registers: 15 Parsed As: Address: 43001-43015 (15) CRC:54799 (OK) Packet 197: MODBUS Response (packet size: 35, data size: 31), 2024-04-04 07:30:07,2975296 +0,0000066 Mode: RTU Address: 1 (Slave) Function: 3 (Read Holding Registers) Parsed As: Register0: 18002 Register1: 18999 Register2: 17228 Register3: 17712 Register4: 19010 Register5: 0 Register6: 0 Register7: 0 Register8: 0 Register9: 0 Register10: 0 Register11: 0 Register12: 0 Register13: 0 Register14: 0 CRC:49442 (OK) Packet 198: MODBUS Request (packet size: 8, data size: 4), 2024-04-04 07:30:08,5621386 +1,2646090 Mode: RTU Address: 1 (Slave) Function: 4 (Read Input Registers) Starting Address: 3000 Number of Registers: 125 Parsed As: Address: 33000-33124 (125) CRC:45610 (OK) Packet 275: MODBUS Response (packet size: 255, data size: 251), 2024-04-04 07:30:08,9717808 +0,0000104 Mode: RTU Address: 1 (Slave) Function: 4 (Read Input Registers) Parsed As: Register0: 1 Register1: 0 Register2: 491 Register3: 664 Register4: 7 Register5: 0 Register6: 491 Register7: 0 Register8: 0 Register9: 0 Register10: 0 Register11: 0 Register12: 0 Register13: 0 Register14: 0 ... CRC:8463 (OK) Packet 276: MODBUS Request (packet size: 8, data size: 4), 2024-04-04 07:30:08,9965740 +0,0247932 Mode: RTU Address: 1 (Slave) Function: 4 (Read Input Registers) Starting Address: 3125 Number of Registers: 125 Parsed As: Address: 33125-33249 (125) CRC:9077 (OK) Packet 353: MODBUS Response (packet size: 255, data size: 251), 2024-04-04 07:30:09,4101219 +0,0000092 Mode: RTU Address: 1 (Slave) Function: 4 (Read Input Registers) Parsed As: Register0: 0 Register1: 0 Register2: 0 Register3: 0 Register4: 0 Register5: 0 Register6: 0 Register7: 0 Register8: 0 Register9: 0 Register10: 0 Register11: 0 Register12: 0 Register13: 0 Register14: 0 ... CRC:14275 (OK) Packet 354: MODBUS Request (packet size: 8, data size: 4), 2024-04-04 07:30:09,5808511 +0,1707292