Monitorizar con raspberry

Conectamos el cable que viene con el inversor. Al inversor el exttremo RJ45 y por el otro lado es serial. Compramos un cable serial a USB y lo conectamos a este cable (por el serial) y a la raspberry

Ahora miramos los puertos USB de la raspberry

pi@raspberrypi:~ $ lsusb 
Bus 001 Device 004: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 001 Device 005: ID 0665:5161 Cypress Semiconductor USB to Serial
Bus 001 Device 006: ID 0424:7800 Standard Microsystems Corp. 
Bus 001 Device 003: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
Bus 001 Device 002: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Nos quedamos con la línea que pone USB to Serial:

Bus 001 Device 005: ID 0665:5161 Cypress Semiconductor USB to Serial

La que pone “Prolific Technology, Inc. PL2303 Serial Port” es del puerto RJ45 que veremos mas tarde.

Como root buscamos el puerto:

root@raspberrypi:~# ls -l /dev/hidraw*
crw------- 1 root root 244, 0 Jun 22 15:41 /dev/hidraw0

Es el puerto hidraw0

Ahora ejecutamos python y lanzamos estos comandos:

Python 2.7.16 (default, Oct 10 2019, 22:02:15) 
[GCC 8.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

import os,sys
fd = open('/dev/hidraw0', 'r+')
fd.write('QPIGS\xB7\xA9\r')
res = fd.read(110).encode('string-escape')
res = res.split("\\")
res = res[0][1:].split(" ")
print 'res=', res

Nos tiene que devolver algo como esto:

res= ['000.0', '00.0', '230.0', '50.0', '0252', '0246', '005', '370', '53.30', '001', '100', '0044', '0006', '127.6', '53.18', '00000', '00010110', '00', '00', '00319', '010']

El mapeo de los valores sería el siguiente:

0		000.0
1		00.0
2	AC output voltage	230.0
3	AC output frequency	50.0
4	AC output apparent power	0184
5	AC output active power	0109
6	Output load percent	003
7	BUS voltage	370
8	Battery voltage	53.20
9	Battery charging current	000
10	Battery capacity	100
11	Inverter heat sink temperature	0043

Pruebas del puerto:

root@raspberrypi:~# lsusb -v -d 0665:5161

Bus 001 Device 005: ID 0665:5161 Cypress Semiconductor USB to Serial
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x0665 Cypress Semiconductor
  idProduct          0x5161 USB to Serial
  bcdDevice            0.02
  iManufacturer           3 STMicroelectronics
  iProduct                1 HID in FS Mode
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0022
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.11
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      27
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              32
can't get device qualifier: Resource temporarily unavailable
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0001
  Self Powered