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Appendix
31.5 Digital Interfaces
Solar-Log™provides two interfaces for exporting the current data.
The data is updated every 15-60 seconds.
Warning!
The following descriptions for two interfaces are intended for users with a technical
background. Solare Datensysteme provides these interfaces without any guarantee
and with the exclusion of any legal liability.
We do not offer any telephone support for these two interfaces.
Wikipedia is a source for general information:
http://en.wikipedia.org/wiki/Ajax_(programming)
31.5.1 Modbus TCP
The intention of this interface is to give easy access to the Solar-Log™ internal data for external SCADA
like systems. The interface is designed to read out live data of the attached PV-system.
The interface is not designed to configure the Solar-Log™ or the attached devices. All configuration must
be done via the standard Solar-Log™ Web access either local or remote.
ModbusTCP port:
•
502
Required Solar-Log™ firmware:
•
2.8.1 Build 49
Slave ID:
•
1
Implemented Modbus functions:
•
04 to read one or multiple 16 bit words
•
06 to write one 16 bit word
•
16 to write multiple 16 bit words
The Solar-Log™ Modbus implementation uses different byte and word orders. The Modbus protocol byte
order follows the big-endian Modbus specification and is thus compatible with standard Modbus imple-
mentations. Therefore, the higher byte in value is transferred first.
The proprietary-specific register order for 32-bit values uses a little-endian word order. For a 32-bit value,
the lower value word is stored in the first register and the higher value word in the second register.
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