Modbus register map for Power Meter (EM)
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Know your energy Modbus Register Map EM – eTactica Power Meter

EM -SC/FC Modbus Register Map

EM -SC/FC Modbus Register Map Introduction All eTactica hardware devices are standard Modbus/RTU server devices, with a half-duplex RS485 serial interface. This document covers the following products: • EM-SC: the eTactica Power Meter with split-core current sensors • EM-FC: the eTactica Power Meter with flexible-coil current sensors The eTactica measurement devices implement a register table with both configurable and readonly parameters. These parameter values are accessible via standard Modbus requests. As the eTactica measurement devices are standard Modbus/RTU, you can use them with...

EM -SC/FC Modbus Register Map Data Encoding According to the Modbus protocol specification the Big-Endian representation of both data and addresses is used. This means that the most significant byte (MSB) is sent first. Addressing The addresses used in this document are native register address. Not the register number, nor Modicon formatting with 30000/40000. For example, register 0x2000, the Vendor ID, could also be described as register 8192 (decimal) 8193 (decimal, register number) or 48192 (Modicon holding register format) See these pages for more of information: • • The Register Map...

EM -SC/FC Modbus Register Map Example 16bit value Read a 16-bit value, Line frequency on EM-xxx, data address 0x200F.

EM -SC/FC Modbus Register Map Common Registers Below you find the registers, common to all eTactica measurement devices.

EM -SC/FC Modbus Register Map Modbus Registers - EM Specific The following section, continuing on from the "common" block above contains some aggregate readings, and has been available on all EM's The registers containing Power factor values are signed. Active import of energy is given a positive factor, and active export of energy is negative. The number of decimal places depends on the register itself. Distinction of leading/lagging/capacitive/inductive is provided via separate "sign" registers, that are simply -1 or 1.

EM -SC/FC Modbus Register Map

EM -SC/FC Modbus Register Map Active In micro Watt Hours – phase 1 Active In micro Watt Hours – phase 2 Active In micro Watt Hours – phase 3 Active Out micro Watt Hours – phase 1 Active Out micro Watt Hours – phase 2 Active Out micro Watt Hours – phase 3 Reactive In micro VAr hours – phase 1 Reactive In micro VAr hours – phase 2 Reactive In micro VAr hours – phase 3 Reactive Out micro VAr hours – phase 1 Reactive Out micro VAr hours – phase 2 Reactive Out micro VAr hours – phase 3 RMS Voltage in mV – phase 1 – 60 second average RMS Voltage in mV – phase 2 – 60 second average RMS Voltage in...

EM -SC/FC Modbus Register Map RMS Current in mA – phase 1 – last line cycle RMS Current in mA – phase 2 – last line cycle RMS Current in mA – phase 3 – last line cycle Power factor phase 1 – latest value – *10000 Power factor phase 2 – latest value – *10000 Power factor phase 3 – latest value – *10000 Sign of power factor phase 1 Sign of power factor phase 2

EM -SC/FC Modbus Register Map Detailed Register Descriptions Register 0x2006 - Command The command register is a 16 bit value. You use this register to permanently store new configuration settings in EEPROM or reload factory default. The meaning of each bit and bit combination is described in the table below.

EM -SC/FC Modbus Register Map Register 0x2008 - Serial communication settings The serial communication register is a 16 bit value. It allows you to edit the protocol settings for the RS485 serial interface. Take care modifying these settings. It can be tedious to rediscover what the settings are, for an unknown device. Default settings for all devices is: 19200 - 8 - Even - 1 Firmware Limitation The editable feature is only available for devices with firmware version 3.2 or above. After writing a value to this register, you must write to the Command register (0x2006) to store settings in...

EM -SC/FC Modbus Register Map Baud Rate Table Values to write as the lowest byte in this register that represent pre-defined baud rates.

EM -SC/FC Modbus Register Map Register 0x2009 - Modbus slave ID The Modbus slave ID register, is a 16 bit value. It is a configurable register where you can modify the default slave ID for your device. Only the lower byte for this 16 bit value is valid for the slave ID. Take care to preserve the upper byte as is. According to the Modbus protocol, it is only allowed to use addresses from 1 - 247. Register 0x2028 - Cumulative milli Watt hours The cumulative milli Watt hours is a 64 bit signed integer value and is stored in 4 registers from 0x2028 to 0x202B. Although this value is a 64 bit...

EM -SC/FC Modbus Register Map Register 0x2021 - Status In register 0x2021 you find the status bitmap for the EM device family. The bitmap indicates possible error states, as explained below. When the following bit position of the bitmap is set, or ‘1’, this indicates an error accordingly. For no errors, the readings are all zeroes. Any of these bits being set results in the status LED blinking faster than normal (every 0,2 sec instead of every 0,5 sec).