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Installation of the CheckWatt CM10 and the electricity meter from Eastron should be
done according to their respective installation manuals. The following documentation
specifically describes how communication is established between the CheckWatt
CM10 and the electricity meter from Eastron. For measurement via current
transformers, please note that the order in which phases L1, L2, L3 are connected for
voltage measurement must match the order in which they are connected for current
measurement. LA and NA are connected to phase and neutral respectively for the
meter's internal power supply.
Communication between the CM10 and the electricity meter from Eastron is done
using Modbus RTU via a shielded twisted pair cable.
Eastron SDM630 Modbus
Connect the bus cable (shielded twisted pair
cable) between the electricity meter and the
CM10:
Connect the cable from the meter's
●
terminal 'A+' to terminal COM1: (+) on the
CM10 (Note: rear row).
Connect the cable from the meter's
●
terminal 'B-' to terminal COM1: (-) on the
CM10 (Note: rear row).
Eastron SDM630MCT
Connect the bus cable (shielded twisted pair
cable) between the electricity meter and the
CM10:
Connect the cable from the meter's
●
terminal 14 (A/TX+) to terminal COM1: (+) on
the CM10 (Note: rear row).
Connect the cable from the meter's
●
terminal 13 (B/TX-) to terminal COM1: (-) on
the CM10 (Note: rear row).
Installation manual
CheckWatt CM10 and Eastron SDM 630(MCT)
Updated 2023-11-17
Gamlestadsvägen 18B
415 02 Göteborg
SWEDEN
www.checkwatt.se
info@checkwatt.se
+46 101 88 65 65
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Summary of Contents for CheckWatt CM10
- Page 1 CheckWatt CM10 and Eastron SDM 630(MCT) Updated 2023-11-17 Installation of the CheckWatt CM10 and the electricity meter from Eastron should be done according to their respective installation manuals. The following documentation specifically describes how communication is established between the CheckWatt CM10 and the electricity meter from Eastron.
- Page 2 Daisy Chain If multiple electricity meters and/or inverters are connected via Modbus RTU, connect them in a daisy chain with the CM10 as the master according to the diagram in the image below. Always ensure that (+) is connected to (+) and (-) is connected to (-), and that each meter has a unique Modbus address (1, 2, 3, etc.) set to ensure proper communication.
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