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OPERATION
The PVmet-500is designed to work with an RS-485 SunSpec compliant host. The PVmet-500communicates with a host logger, DCS or
SCADA via Modbus RTU interface. The system requirements are listed in
Table 2.
SUNSPEC REGISTER MAP
The PVmet-500was designed to follow SunSpec models outlined by the SunSpec Alliance. Other registers other than SunSpec specified
ones are provided for extra features if desired.
SUPPORTED SUNSPEC MO DELS
The PVmet-500is SunSpec compliant and supports several environmental and irradiance models 302, 303 and 307.
The 302 model is for solar irradiance. The PVmet-500provides data for global horizontal irradiance, plane-of-array irradiance and other
irradiance, all other data should be ignored. The 302 model has the following data characteristics shown in Table 3.
Table 2: Default Modbus RS-485 Communication settings
Baud Rate:
Parity:
Stop Bits:
Data bits:
Slave Address:
Interface mode:
Max Modbus Poll Rate:
- 17 -
9600 or 19200bps
None
1
8
60
2-wire half duplex
100ms
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