Siemens SEM3 Single Phase Modbus register map

Device identity

What a tool can read to check that this map fits the connected device (SPEC.md section 4.7). Registers with a role are read like any other register.

Sources and notes

• SEM3 - Embedded Micro Metering Module User Manual
  file SIE_MA16_SEM3UserManual_201707060739103020.pdf, Modbus Information: alarm, monitor data, system and double precision energy registers

Source: Siemens, "SEM3 Embedded Micro Metering Module User Manual", chapter Modbus Information

• Addresses are the wire addresses: the manual's external addresses (40001 for the first register) minus 40001. The double precision energy registers are given by the manual with an internal address, which is used as it is.
• Each monitor has its own block of registers: single-pole monitors start at a fixed base address plus the size of the block times the monitor number.
• The mini-monitor registers (10 registers per monitor, from address 40301) hold up to 10 data points chosen in the web interface, so their content depends on the configuration and they are not in this map.
• The manual does not state the order of the two registers of a 32-bit value or the byte order of floats; this map assumes the most significant register first.
• Factory settings of the RS-485 port: address 126, 38400 baud, even parity.
• The manual lists the monitor values in kilowatts, kilovolt-amperes and kilovolt-ampere-hours with a resolution of 0.001; the units shown are those names.