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5.3.2 Connection to multiple devices
Multiple inverters are connected to the Logger1000 in the RS485 daisy chain manner. If
more than 15 inverters (14 inverters, for devices other than Logger1000) are connected on
the RS485 bus, it is recommended to connect a 120Ω terminal resistor in parallel on the
RS485A and RS485B lines at the head and tail end of the bus.
With an outdoor device connected to the Logger1000, it is recommended to con-
nect an SPD to protect the Logger1000 from lightning damage.
• The Logger1000 allows for 3 inputs of RS485 buses and 30 devices at most.
• When the number of device types is less than or equal to the number of RS485 ports of
Logger1000, it is recommended to connect different types of devices to different RS485
ports separately.
• The addresses of devices on each RS485 bus must be different from one another and
within the address range set for the Logger1000 (address range of residential inverters
and string inverters manufactured by SUNGROW: 1-247; address range of third-party
devices: 1-255). Otherwise, communication error will occur.
• Serial port parameters of each device on the RS485 bus should be consistent with those
of the Logger1000. The serial port parameters include baud rate, data bit, stop bit, and
check bit.
5.3.3 Connection to Smart Energy Meter
It is recommended to use the Smart Energy Meter whose communication protocol complies
with DL/T645-1997/2007 protocol or Modbus protocol. Logger1000 can be connected to the
5 Electrical Connection User Manual
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