==== Modbus communication ====
**Read Limits:** Do not attempt to read more than 40 parameters (80 registers) in a single Modbus request to avoid exception errors.

RS485 communication interface, MODBUS RTU protocol:
  * Baudrate: 9600 Baud (default, can be set)
  * Parity: Even
  * Databits: 8
  * Stopbits: 1
  * Default slave ID: 1 (SMD72D), 45 (SDM72CTM)
  * Number of Drivers and Receivers: 32 Drivers, 32 Receivers (without repeater)
  * Maximum Cable Length: 1200 m
  * Maximum Data Rate: 10 Mbaud
  * Maximum Common Mode Voltage: 12 V .. –7 V
  * Minimum Driver Output Levels (Loaded): +/– 1.5 V
  * Minimum Driver Output Levels (Unloaded): +/– 6 V
  * Drive Load: Minimum 60 ohms
  * Driver Output Short Circuit Current Limit: 150 mA to Gnd, 250 mA to 12 V, 250 mA to -7 V
  * Minimum Receiver Input Resistance: 12 kΩ 
  * Receiver Sensitivity: +/- 200 mV

==== Convert word array to real array ====
The Input registers are in a word format and must be converted into real numbers in pairs. This conversion involves straightforward bit-level merging, which can be implemented in LabView, for example, as shown below: 

{{:sensor:conv_word_array_to_real_array_labview.png|Convert word array (input registers) to real array in labView}}

==== 32-bit (2 words) input registers ====
The registers are read-only. All values are 4-byte IEEE 754 float type.
|< 100% 6% 6% 60% 10% 18%>|
^Register Nr^32 bit address^Description^Unit^Type SDM...|
|30001|1|Phase 1 Line to Neutral Volts|V|72, 230, 630|
|30003|2|Phase 2 Line to Neutral Volts|V|72, 630|
|30005|3|Phase 3 Line to Neutral Volts|V|72, 630|
|30007|4|Phase 1 Current|A|72, 230, 630|
|30009|5|Phase 2 Current|A|72, 630|
|30011|6|Phase 3 Current|A|72, 630|
|30013|7|Active Power Phase 1|W|72, 230, 630|
|30015|8|Active Power Phase 2|W|72, 630|
|30017|9|Active Power Phase 3|W|72, 630|
|30019|10|Apparent Power Phase 1|VA|72, 230, 630|
|30021|11|Apparent Power Phase 2|VA|72, 630|
|30023|12|Apparent Power Phase 3|VA|72, 630|
|30025|13|Reactive Power Phase 1|VAr|72, 230, 630|
|30027|14|Reactive Power Phase 2|VAr|72, 630|
|30029|15|Reactive Power Phase 3|VAr|72, 630|
|30031|16|Power Factor Phase 1 \\ (pos: forward Current, neg: reverse Current)|-|72, 230, 630|
|30033|17|Power Factor Phase 2 \\ (pos: forward Current, neg: reverse Current)|-|72, 630|
|30035|18|Power Factor Phase 3 \\ (pos: forward Current, neg: reverse Current)|-|72, 630|
|30037|19|Phase 1 Phase angle|Degrees|230, 630|
|30039|20|Phase 2 Phase angle|Degrees|630|
|30041|21|Phase 3 Phase angle|Degrees|630|
|30043|22|Average Line to Neutral Volts|V|72, 630|
|30047|24|Average Line Current|A|72, 630|
|30049|25|Summary of Line Currents|A|72, 630|
|30053|27|Total System Power|W|72, 630|
|30057|29|Total System Apparent Power|VA|72, 630|
|30061|31|Total System Reactive Power|VAr|72, 630|
|30063|32|Total System Power factor \\ (pos: forward Current, neg: reverse Current)|-|72, 630|
|30067|34|Total System Phase angle|Degrees|630|
|30071|36|Frequency of Supply Voltages|Hz|72, 230, 630|
|30073|37|Total Import Energy|kWh|72, 230, 630|
|30075|38|Total Export Energy|kWh|72, 230, 630|
|30077|39|Total Import Reactive Energy|kVArh|230, 630|
|30079|40|Total Export Reactive Energy|kVArh|230, 630|
|30081|41|Total Power|kVAh|630|
|30083|42|Current Hour|Ah|630|
|30085|43|Total System Power Demand \\ (Power sum Demand calculation is for Import – Export)|W|230, 630|
|30087|44|Maximum total System Power Demand \\ (Power sum Demand calculation is for Import – Export)|VA|230, 630|
|30089|45|Current System positive Power Demand|W|230, 630|
|30091|46|Maximum System positive Power Demand|W|230, 630|
|30093|47|Current System reverse Power Demand|W|230, 630|
|30095|48|Maximum System reverse Power Demand|W|230, 630|
|30101|51|Total System Apparent Power Demand|VA|630|
|30103|52|Maximum Total System Apparent Power Demand|VA|630|
|30105|53|Neutral Current Demand|A|630|
|30107|54|Maximum Neutral Current Demand|A|630|
|30201|101|Line 1 to Line 2 Volts|V|72, 630|
|30203|102|Line 2 to Line 3 Volts|V|72, 630|
|30205|103|Line 3 to Line 1 Volts|V|72, 630|
|30207|104|Average Line to Line Volts|V|72, 630|
|30225|113|Neutral Current|A|72, 630|
|30235|118|Phase 1 L/N Volts THD|%|630|
|30237|119|Phase 2 L/N Volts THD|%|630|
|30239|120|Phase 3 L/N Volts THD|%|630|
|30241|121|Phase 1 Current THD|%|630|
|30243|122|Phase 2 Current THD|%|630|
|30245|123|Phase 3 Current THD|%|630|
|30249|125|Average Line to Neutral Volts THD|%|630|
|30251|126|Average Line Current THD|%|630|
|30259|130|Phase 1 Current Demand|A|230, 630|
|30261|131|Phase 2 Current Demand|A|630|
|30263|132|Phase 3 Current Demand|A|630|
|30265|133|Maximum Phase 1 Current Demand|A|230, 630|
|30267|134|Maximum Phase 2 Current Demand|A|630|
|30269|135|Maximum Phase 3 Current Demand|A|630|
|30335|168|Line 1 to Line 2 Volts THD|%|630|
|30337|169|Line 2 to Line 3 Volts THD|%|630|
|30339|170|Line 3 to Line 1 Volts THD|%|630|
|30341|171|Average Line to Line Volts THD|%|630|
|30343|172|Total Active Energy \\ (total kWh / kVarh equals Import + Export)|kWh|72, 230, 630|
|30345|173|Total Reactive Energy \\ (total kWh / kVarh equals Import + Export)|kvarh|72, 230, 630|
|30347|174|L1 Import Active Energy|kWh|630|
|30349|175|L2 Import Active Energy|kWh|630|
|30351|176|L3 Import Active Energy|kWh|630|
|30353|177|L1 Export Active Energy|kWh|630|
|30355|178|L2 Export Active Energy|kWh|630|
|30357|179|L3 Export Active Energy|kWh|630|
|30359|180|L1 total Active Energy \\ (total kWh / kVarh equals Import + Export)|kWh|630|
|30361|181|L2 total Active Energy \\ (total kWh / kVarh equals Import + Export)|kWh|630|
|30363|182|L3 total Active Energy \\ (total kWh / kVarh equals Import + Export)|kWh|630|
|30365|183|L1 Import Reactive Energy|kvarh|630|
|30367|184|L2 Import Reactive Energy|kvarh|630|
|30369|185|L3 Import Reactive Energy|kvarh|630|
|30371|186|L1 Export Reactive Energy|kvarh|630|
|30373|187|L2 Export Reactive Energy|kvarh|630|
|30375|188|L3 Export Reactive Energy|kvarh|630|
|30377|189|L1 total Reactive Energy \\ (total kWh / kVarh equals Import + Export)|kvarh|630|
|30379|190|L2 total Reactive Energy \\ (total kWh / kVarh equals Import + Export)|kvarh|630|
|30381|191|L3 total Reactive Energy \\ (total kWh / kVarh equals Import + Export)|kvarh|630|
|30385|193|Current Resettable Total Active Energy|kWh|72, 230, 630|
|30387|194|Current Resettable Total Reactive Energy|kvarh|72, 230, 630|
|30389|389|Resettable Import Active Energy|kWh|72|
|30391|391|Resettable Export Active Energy|kWh|72|
|30397|397|Netto Energy (Import - Export)|kWh|72|
|31281|1281|Total Import Active Power|W|72|
|31283|1283|Total Export Active Power|W|72|

The additional energy meters with Easton-type Modbus communication: [[eastron_sdm_72|SDM72]], [[eastron_sdm_230|SDM230]], [[eastron_sdm_630|SDM630]]

Source: https://www.eastroneurope.com/images/uploads/products/protocol/SDM630_MODBUS_Protocol.pdf

{{ :meas:sdm630.csv |SDM630/SDM230 Modbus Import registers in .csv file-format}}


{{page>:tarhal}}

==== 32-bit (2 words) holding registers ====
Registers are classified as read-only (**r**), read/write (**rw**), or write-only (**w**). All values are 4-byte IEEE 754 floating-point numbers.

|< 100% 4% 4% 8% 50% 20% 15%>|
^Register Nr^32 bit address^Parameter^Valid range^type^Type SDM…|
|40003|3|Demand period|Specify demand periods as 0, 5, 8, 10, 15, 20, 30, or 60 minutes, with 60 as the default. Setting the period to 0 displays the current parameter value for demand, while demand max shows the highest parameter value since the last reset.|Length: 4 byte \\ Data Format: Float \\ Mode:rw|630|
|40011|11|System type|Write system type: 3p4w = 3, 3p3w = 2, and 1p2w= 1. \\ Requires password, see parameter "password".|Length: 4 byte \\ Data Format: Float \\ Mode:rw|72, 630|
|40013|13|Pulse 1 width|Specify pulse1 duration in milliseconds: 60, 100, or 200, with 100 as the default.|Length: 4 byte \\ Data Format: Float \\ Mode:rw|230, 630|
|40015|15|Password lock|Enter any value to access password lock-protected registers. \\ To check the lock status: 0 indicates locked, 1 indicates unlocked. \\ Reading this status will also reset the password timeout to one minute.|Length: 4 byte \\ Data Format: Float \\ Mode:rw|630|
|40019|19|Network Parity Stop|Specify the network port parity and stop bits for the MODBUS Protocol as follows: \\ 0 = One stop bit, no parity (default). \\ 1 = One stop bit, even parity. \\ 2 = One stop bit, odd parity. \\ 3 = Two stop bits, no parity. \\ A restart is required for changes to take effect.|Length: 4 byte \\ Data Format: Float \\ Mode:rw|72, 230, 630|
|40021|21|Network Node|Write the network port node address: 1 to 247 for MODBUS Protocol, default 1. Requires a restart to become effective.|Length: 4 byte \\ Data Format: Float \\ Mode:rw|72, 230|
|40023|23|Pulse1 Divisor1|Write pulse divisor index: n = 0 to 5 \\ 0: 0.0025 kWh(kVArh)/imp \\ 1: 0.01 kWh(kVArh)/imp \\ 2: 0.1 kWh(kVArh)/imp \\ 3: 1 kWh(kVArh)/imp \\ 4: 10 kWh(kVArh)/imp \\ 5: 100 kWh(kVArh)/imp|Length: 4 byte \\ Data Format: Float \\ Mode:rw|630|
|40025|25|Password|Enter the password to access protected registers. **Default: 0000.**|Length: 4 byte \\ Data Format: Float \\ Mode:rw|630|
|40029|29|Network Baud Rate|Write the network port baud rate for MODBUS Protocol, where: \\ 0: 2400 baud \\ 1: 4800 baud \\ 2: 9600 baud, default \\ 3: 19200 baud \\ 4: 38400 baud \\ Requires a restart to become effective|Length: 4 byte \\ Data Format: Float \\ Mode:rw|72, 230, 630|
|40063|63|Current Transformer ratio|Configurable scale from 1 to 2000, example: 200A:5A -> 200 divided by 5 -> Set value: 40|Length: 4 byte \\ Data Format: Float \\ Mode:rw|630|
|40087|87|Pulse 1 Energy Type|Write MODBUS Protocol input parameter for pulse output 1: \\ 1: import active energy \\ 2: total active energy \\ 4: export active energy, default \\ 5: import reactive energy \\ 6: total reactive energy \\ 8: export reactive energy|Length: 4 byte \\ Data Format: Float \\ Mode:rw|630|
|461457|-|reset|00 00 ：reset the Maximum demand|Length: 2 byte \\ Data Format: Hex \\ Mode:w|630|
|462721|-|Demand Interval|Slide Time, Automatic Scroll Display Interval (Scroll Time), Backlight Time \\ Scroll Time=0: the display does not scroll automatically \\ Backlight Time=0: Backlight is Always On.|Length: 4 byte \\ Data Format: BCD "min-min-s-min"\\ Mode:rw|230|
|463761|-|System Power|Default Format: Hex \\ 0000: 0.001kWh (kVArh) /imp (default) \\ 0001: 0.01kWh (kVArh) /imp \\ 0002: 0.1kWh (kVArh) /imp \\ 0003: 1kWh (kVArh) /imp|Length: 4 byte \\ Data Format: Float \\ Mode:rw|230|
|463776|-|Measurement Mode|Data Format: Hex \\ 0001: Mode 1 (Total = Import) \\ 0002: Mode 2 (Total = Import + Export) \\ 0003: Mode 3 (Total = Import - Export)|Length: 4 byte \\ Data Format: Float \\ Mode:rw|230|
|463792|-|Pulse Output & LED Indicator Mode|Data Format: Hex \\ 0000: Import & Export Energy, LED flashes for Import & Export Energy \\ 0001: Import Energy, LED flashes for Import Energy only \\ 0002: Export Energy, LED flashes for Export Energy only|Length: 4 byte \\ Data Format: Float \\ Mode:rw|230|
|464513|-|Serial number|Serial number|Length: 4 byte \\ Data Format: unsigned int32 \\ Mode:r|630|