Leviton 3300 series, Инструкция по установке и эксплуатации, Страница: 34 / 48

8 Communications – History Data Extraction
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When communicating with the meter base unit for historical data extraction, always send messages
to Modbus address 83 regardless of the meter’s normal Modbus address configuration.
For diagnostic purposes, history data can be extracted from the meter using a Modbus RTU connection to
the meter base unit. This feature is intended for trained field service personnel only. Contact Leviton
Customer Support for assistance.
8.1 Connecting for History Data Extraction
WARNING: TO AVOID FIRE, SHOCK OR DEATH , turn off all power supplying equipment before
working on or inside the equipment. Use a properly rated voltage sensing device to confirm
power is off.
1. Install meter as outlined in Section 3.
2. Change the JP1 and JP2 jumper settings as shown in Figure 18.
3. Use shielded twisted-pair cable to prevent interference. Connect Inverting (-), Non-Inverting (+),
and Signal Common (C) wires using the 6-pin removable terminal block shown in Figure 18. Do
not over-tighten the terminal screws. Modbus output is electrically isolated from input power.
4. Before energizing the meter close and secure the enclosure door.
To restore the meter to normal operation, jumpers at JP1 and JP2 must be returned to their default settings.
Figure 18. Base Unit Modbus RTU Connections for History Data Extraction
Move jumpers
at JP1 and JP2
to “ModBus”
position as
shown.
Inverting (-)
Non-Inverting (+)
Signal Common (C)
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