{  
    "rtype":  0,   // 0 = modbus, 1 = http/json

    "name": "MyPV ELWA 2",   // as displayed in the config dialog
    "manufacturer": "MyPV",
    "dev_type": "mypv_elwa2",   // will be prefixed by "meter_"

    // modbus parameters
    "rtu": {
        "silence_period": 50,    // msec
        "silence_same_slave": false,
        "retries": 4,
        "rcv_timeout": 120       // msec
    },
    "modbus_read": 3,            // function code to read registers
    "modbus_read_max_registers": 60, 
    "modbus_allow_gaps": false,    
    "modbus_write": 10,          // function code to write register(s)
    "modbus_write_max_registers": 48,
    
    // values used to build the model string
    "type_designation": {
       "fixed": "Battery"
    },
    "version": {
       "fixed": "1.0"
    },
    "firmware_version": {
       "fixed": "1.0"
    },
    "serial": {
       "address": 1013,
       "type": "int16",
    },
    
    // instantaneous values
    "power_w": {
       "address": 1000,
       "type": "int16",
    },
    "temp1": {
       "address": 1001,
       "type": "int16"
    },
    "status": {
       "address": 1003,
       "type": "int16"
    },
    "temp2": {
       "address": 1030,
       "type": "int16"
    },
}