IBC SOLAR SolControl Pro, Руководство пользователя

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6
4 Cabling
4.1 RS485 and RS232/422
The two RS485 and RS232/422 interfaces are used to query information recorded on various bus devices
such as inverters, power quality analyzers, etc.
The RS232/422 interface can also be used as an RS485 interface. In order to do this the interface has to
be operated in RS422 mode (for this, please refer to the manual of your IBC-SolControl data logger).
Which interface you should use to connect inverters and accessories depends on your specific driver.
Please refer to the appropriate driver datasheet
Please note the following regarding the bus cabling:
§
All devices on a bus must use the same protocol to communicate.
§
The data logger functions exclusively as a master on the bus.
§
The maximum permitted number of bus devices has to be observed (see driver
datasheets).
§
The order of the bus devices on the bus is unimportant.
§ The use of a repeater is necessary for every 32nd bus device and for long cable runs.
§
The bus should be cabled with a twisted and shielded pair of wires.
§
The shield of the bus cable must be grounded at one end of the connection only. The
data logger does not have its own grounding
§
When you wire the bus wires, make sure that AC and DC cables are routed separately.
§
Do not switch the buses signal wires.
§ Different manufacturers interpret the RS485 interface’ s underlying standard differently.
A and B wire labels may be different for different manufacturers. The + and – indicators,
on the other hand, are unambiguous.
§
To prevent reflections, the bus must always be terminated with a parallel terminator.