Why do all register values read zero or max-range garbage?

The 7KT1665 uses 32-bit INT32 and UINT32 values spread across two consecutive 16-bit Modbus registers. If your gateway or polling software reads only one register per address, values will be wrong. Ensure the template is set to read 2 holding registers per data point and that big-endian (high word first) byte order is selected.

The gateway connects but no live values appear in the portal. What now?

Confirm the slave address in the portal matches the address programmed on the meter front panel. Then check baud rate and parity: the PAC1600 supports 300 to 38400 bps and defaults to a specific baud rate set during commissioning. A mismatch in either parameter causes a complete communications blackout. Also verify RS-485 polarity on A/B terminals.

Energy readings look correct but the power register fluctuates wildly. Why?

The power register (address 57) returns signed INT32 data representing instantaneous active power. Short polling intervals combined with load switching can produce rapid swings. Increase the poll interval to 5 to 10 seconds and confirm the portal is not applying an additional scaling factor, as the raw register value already reflects the device's internal scaling.

Phase current readings for L2 and L3 seem identical to L1. What is wrong?

Each phase current occupies its own 32-bit register at distinct addresses (L1 at 7, L2 at 9, L3 at 11). If all three return the same value, check that the template is polling all three addresses independently and that the RS-485 bus is not dropping responses mid-frame, which can cause the gateway to reuse the last valid value for subsequent registers.

Free Modbus template: Siemens 7KT1665 (grid)

The Siemens 7KT1665 is a DIN-rail mounted, three-phase SENTRON PAC1600 energy meter rated for direct measurement up to 80 A, used in industrial plants, commercial buildings, and apartment blocks. This template reads the device over Modbus RTU via RS-485, collecting total active power, cumulative grid energy, and per-phase currents on L1, L2, and L3. With these five registers visible in your ModbusCloud portal, you can track grid consumption, detect phase imbalances, and feed accurate meter data into energy reporting workflows without adding external current transformers.

Name	Address	Function	Type	Unit	Access
power Instantaneous total active power, signed, at grid connection point.	57	FC04	int32	W	R
energy Cumulative active energy imported from the grid.	6687	FC04	uint32	Wh	R
currents_a RMS current on phase L1.	7	FC04	uint32	A	R
currents_b RMS current on phase L2.	9	FC04	uint32	A	R
currents_c RMS current on phase L3.	11	FC04	uint32	A	R