Senva EM-RS485 User manual

Modbus Protocol Guide

EM-RS485

Senva Sensors

9290 SW Nimbus Ave

Beaverton, OR 97008

154-0023-0B

Rev.

Release Date

Description of Change

ECR

11/22/2016

DLE

Initial Release

---

0B 4/10/2017 DLE Updated for firmware v1.1.2 ---

information, and may not be reproduced or distributed without written permission.

EM-RS485 Modbus Protocol Guide Page 2 of 52 154-0023-0B

Table of Contents

Readable ..................................................................................................................................R

Access Writable....................................................................................................................................W

Legend Writable with 0 only (statistics reset, see System Readings) ...............................W0

Saved in non-volatile configuration memory ...........................................................NV

Configuration................................................................................................................................................ 6

Holding Registers ......................................................................................................................................... 8

System Configuration.......................................................................................................................................................................8

R102 Reset Reason ......................................................................................UINT16 ...................R .............................8

R103 Reset Count ........................................................................................UINT16 ...................R/NV......................8

R104/05 Up Time ................................................................................................UINT32 ...................R .............................8

R111 Identify Meter ....................................................................................BOOL.......................R/W........................8

R112 Auto Protocol .....................................................................................BOOL.......................R/W/NV ................9

R114 Auto Baud Rate .................................................................................BOOL.......................R/W/NV................9

R116 Auto Parity ..........................................................................................BOOL.......................R/W/NV................9

R117 Auto Data Bits ....................................................................................BOOL.......................R/W/NV................9

R118 Auto Stop Bits ....................................................................................BOOL.......................R/W/NV ............. 10

R122 RS485 Protocol ..................................................................................UINT16 ...................R/W/NV ............. 10

R123 Slave Address .....................................................................................UINT16 ...................R/W/NV............. 10

R124/25 RS485 Baud Rate ...............................................................................UINT32 ...................R/W/NV ............. 10

R126 RS485 Parity ........................................................................................UINT16 ...................R/W/NV ............. 11

R127 RS485 Data Bits .................................................................................UINT16 ...................R/W/NV ............. 11

R128 RS485 Stop Bits ..................................................................................UINT16 ...................R/W/NV............. 11

R133 Temperature Units ...........................................................................UINT16 ...................R/W/NV............. 11

R134 Smoothed Temperature Response Time ................................UINT16 ...................R/W/NV............. 12

R142 Smoothed Frequency Response Time .....................................UINT16 ...................R/W/NV ............. 12

R144 Smoothed Voltage Response Time ...........................................UINT16 ...................R/W/NV............. 12

R152 System Current Sensor Technology ..........................................UINT16 ...................R .......................... 12

R153 Angle Units .........................................................................................UINT16 ...................R/W/NV ............. 13

R154 Smoothed Current Response Time ...........................................UINT16 ...................R/W/NV ............. 13

R161 System Phase Selection .................................................................UINT16 ...................R/W/NV............. 13

R162 Power Spectrum ...............................................................................UINT16 ...................R/W/NV............. 13

R163 Power Units ........................................................................................UINT16 ...................R/W/NV ............. 14

R164 Smoothed Power Response Time ..............................................UINT16 ...................R/W/NV ............. 14

R170 Energy Data Type .............................................................................BOOL.......................R/W/NV ............. 14

R173 Energy Units .......................................................................................UINT16 ...................R/W/NV............. 15

R174/75 Energy Timestamp ...........................................................................FLOAT.....................R .......................... 15

R181 Demand Synchronization Mode .................................................UINT16 ...................R/W/NV............. 15

R183 Demand Window Time ..................................................................UINT16 ...................R/W/NV ............. 16

EM-RS485 Modbus Protocol Guide Page 3 of 52 154-0023-0B

R184/85 Elapsed Demand Window ............................................................UINT32 ...................R/W0 .................. 16

R186/87 Demand Window Count ................................................................UINT32 ...................R/NV................... 16

R190/91 Reset Meter Configuration ...........................................................UINT32 ...................W......................... 17

R192/93 Reset Meter Statistics ......................................................................UINT32 ...................W......................... 17

R194 Energy Reset Count .........................................................................UINT16 ...................R/NV................... 17

R195 Auto Reset Statistics ........................................................................BOOL.......................R/W/NV............. 17

Binary Inputs .....................................................................................................................................................................................18

R200 Setup Button ......................................................................................BOOL.......................R .......................... 18

R201 Binary Input 1 .....................................................................................BOOL.......................R .......................... 18

R202 Binary Input 2 .....................................................................................BOOL.......................R .......................... 18

Pulse Inputs .......................................................................................................................................................................................18

R208 Pulse Input Debounce Time .........................................................UINT16 ...................R/W/NV............. 18

R210/11 Pulse Input 1 Count .........................................................................UINT32 ...................R/W/NV............. 19

R212/13 Pulse Input 1 Active Elapsed Time .............................................UINT32 ...................R/W0 .................. 19

R214/15 Pulse Input 1 Maximum .................................................................UINT32 ...................R/W/NV............. 19

R216/17 Pulse Input 1 Preset .........................................................................UINT32 ...................R/W/NV............. 19

R218/19 Pulse Input 1 Count Before Preset .............................................UINT32 ...................R/NV................... 19

R220/21 Pulse Input 2 Count .........................................................................UINT32 ...................R/W/NV............. 19

R222/23 Pulse Input 2 Active Elapsed Time .............................................UINT32 ...................R/W0 .................. 19

R224/25 Pulse Input 2 Maximum .................................................................UINT32 ...................R/W/NV............. 19

R226/27 Pulse Input 2 Preset .........................................................................UINT32 ...................R/W/NV............. 19

R228/29 Pulse Input 2 Count Before Preset .............................................UINT32 ...................R/NV................... 19

PowerPrint .........................................................................................................................................................................................20

R240 PowerPrint Alarm .............................................................................BOOL.......................R .......................... 20

R241 PowerPrint Active .............................................................................BOOL.......................R/W/NV............. 20

R242/43 PowerPrint Frequency ....................................................................FLOAT.....................R/W/NV............. 20

R244/45 PowerPrint Frequency Tolerance ...............................................FLOAT.....................R/W/NV............. 21

R246/47 PowerPrint Voltage Tolerance .....................................................FLOAT.....................R/W/NV ............. 21

R248/49 PowerPrint Voltage Angle Tolerance .......................................FLOAT.....................R/W/NV............. 21

Miscellaneous ...................................................................................................................................................................................21

R276-91 Location String ..................................................................................ASCII........................R/W/NV ............. 21

R292-99 User Data .............................................................................................UINT16 ...................R/W/NV ............. 21

System Readings .............................................................................................................................................................................22

R310/11 Temperature .......................................................................................FLOAT.....................R/W0 .................. 22

R380/81 Power Supply Voltage ....................................................................FLOAT.....................R/W0 .................. 22

R400 Active Conditions .............................................................................UINT16 ...................R .......................... 23

R401 Previous Conditions ........................................................................UINT16 ...................R/W0 .................. 23

R410/11 Line Frequency ..................................................................................FLOAT.....................R/W0 .................. 23

R420/21 Phase Average RMS Voltage ........................................................FLOAT.....................R/W0 .................. 23

R450/51 Phase to Phase Average RMS Voltage ......................................FLOAT.....................R/W0 .................. 24

R520/21 Phase Average RMS Current ........................................................FLOAT.....................R/W0 .................. 24

R540/41 Phase Average Current Angle .....................................................FLOAT.....................R/W0 .................. 24

EM-RS485 Modbus Protocol Guide Page 4 of 52 154-0023-0B

R550/51 System Power Factor ......................................................................FLOAT.....................R/W0 .................. 25

R600/09 Total Real Power ...............................................................................FLOAT.....................R/W0 .................. 25

R610/11 Phase Average Real Power ...........................................................FLOAT.....................R/W0 .................. 25

R620/21 Net Real Power ..................................................................................FLOAT.....................R/W0 .................. 25

R640/41 Total Reactive Power .......................................................................FLOAT.....................R/W0 .................. 25

R650/51 Phase Average Reactive Power ...................................................FLOAT.....................R/W0 .................. 26

R660/61 Total Apparent Power ....................................................................FLOAT.....................R/W0 .................. 26

R670/71 Phase Average Apparent Power .................................................FLOAT.....................R/W0 .................. 26

R700/01 Total Real Energy ..............................................................................FLOAT*...................R/NV................... 26

R720/21 System Real Energy .........................................................................FLOAT*...................R/NV................... 26

R740/41 Total Reactive Energy .....................................................................FLOAT*...................R/NV................... 27

R760/61 Total Apparent Energy ...................................................................FLOAT*...................R/NV................... 27

R800/01 Demand Real Power ........................................................................FLOAT.....................R/W0 .................. 27

R820/21 Demand System Real Power ........................................................FLOAT.....................R/W0 .................. 28

R840/41 Demand Reactive Power ...............................................................FLOAT.....................R/W0 .................. 28

R860/61 Demand Apparent Power .............................................................FLOAT.....................R/W0 .................. 28

R Phase Configuration...................................................................................................................................................................28

R1010-19 CVT Serial Number ...........................................................................ASCII........................R .......................... 28

R1020-29 CVT Model ...........................................................................................ASCII........................R .......................... 28

R1102 CVT Present .........................................................................................BOOL.......................R .......................... 28

R1103 CVT Status ...........................................................................................UINT16 ...................R .......................... 28

R1104 PowerPrint Identity Status ............................................................UINT16 ...................R .......................... 29

R1140/41 Voltage Rating ...................................................................................FLOAT.....................R .......................... 29

R1142/43 Voltage Multiplier .............................................................................FLOAT.....................R/W/NV............. 29

R1144/45 PowerPrint Voltage ..........................................................................FLOAT.....................R/W/NV............. 29

R1146/47 PowerPrint Voltage Angle ............................................................FLOAT.....................R/W/NV............. 30

R1150/51 Current Rating ...................................................................................FLOAT.....................R .......................... 30

R1152/53 Current Multiplier .............................................................................FLOAT.....................R/W/NV............. 30

R1154 Current Sensor Technology ..........................................................UINT16 ...................R .......................... 30

R1161 Power Multiplier Override .............................................................BOOL.......................R/W..................... 31

R1162/63 Power Multiplier ...............................................................................FLOAT.....................R/W/NV............. 31

R1192/93 Statistics Reset ...................................................................................UINT32 ...................R/W..................... 31

R Phase Measurements.................................................................................................................................................................32

R1400 Active Conditions .............................................................................UINT16 ...................R .......................... 32

R1401 Previous Conditions ........................................................................UINT16 ...................R/W0 .................. 32

R1420/21 Phase RMS Voltage ..........................................................................FLOAT.....................R/W0 .................. 32

R1440/41 Phase to Phase Voltage Angle .....................................................FLOAT.....................R/W0 .................. 33

R1450/51 Phase to Phase RMS Voltage ........................................................FLOAT.....................R/W0 .................. 33

R1520/21 Phase RMS Current ..........................................................................FLOAT.....................R/W0 .................. 34

R1540/41 Phase Current Angle .......................................................................FLOAT.....................R/W0 .................. 34

R1550/51 Phase Power Factor .........................................................................FLOAT.....................R/W0 .................. 35

R1600/01 Phase Real Power .............................................................................FLOAT.....................R/W0 .................. 35

EM-RS485 Modbus Protocol Guide Page 5 of 52 154-0023-0B

R1640/41 Phase Reactive Power .....................................................................FLOAT.....................R/W0 .................. 35

R1660/61 Phase Apparent Power ...................................................................FLOAT.....................R/W0 .................. 36

R1700/01 Total Phase Real Energy .................................................................FLOAT*...................R/NV................... 36

R1740/41 Total Phase Reactive Energy ........................................................FLOAT*...................R/NV................... 36

R1760/61 Total Phase Apparent Energy ......................................................FLOAT*...................R/NV................... 37

R1800/01 Demand Real Power ........................................................................FLOAT.....................R/W0 .................. 37

R1840/41 Demand Reactive Power ...............................................................FLOAT.....................R/W0 .................. 38

R1860/61 Demand Apparent Power .............................................................FLOAT.....................R/W0 .................. 38

S Phase.................................................................................................................................................................................................38

R2000 – 2999...............................................................................................................................................................................38

T Phase ................................................................................................................................................................................................38

R3000 – 3999...............................................................................................................................................................................38

Functions.....................................................................................................................................................39

Data Types .........................................................................................................................................................................................39

0x03 Read Holding Registers......................................................................................................................................................40

0x06 Write Single Register...........................................................................................................................................................41

0x08 Diagnostics .............................................................................................................................................................................42

0x00 | Return Query Data .......................................................................................................................................................42

0x01 | Restart Communications...........................................................................................................................................42

0x03 | Change ASCII Input Delimiter .................................................................................................................................43

0x04 | Force Listen Only Mode.............................................................................................................................................43

0x0A | Clear Counters and Diagnostic Register.............................................................................................................44

0x0B – 0x12 | Return Diagnostic Counters ......................................................................................................................44

0x10 Write Multiple Registers.....................................................................................................................................................46

0x11 Report Server ID....................................................................................................................................................................47

0x17 Read/Write Multiple Registers.........................................................................................................................................48

Appendix A: Common Registers ................................................................................................................49

Appendix B: Condition Flags Decoding.....................................................................................................51

Appendix C: Hex Conversions....................................................................................................................52

See Also:

152-0291 EM-RS485 Installation Instructions

154-0022 EM-RS485 BACnet Protocol Guide

EM-RS485 Modbus Protocol Guide Page 6 of 52 154-0023-0B

Configuration

EM-RS485

POWER

GND

A (+)

COM

B (–)

To CVTs

R S T

Device

Status

Line

Status

RS485

Status

CVT

Status

Setup

Button

✓Get In ✓Get Out Get Data

Congratulations on installing your new Senva EM-RS485 energy meter!This Modbus Protocol Guide assumes

the first stage of installation is complete, with the meter and any CVTs connected and powered. A green

Device Status indicates the meter is powered and ready. If not, refer to the separate Installation Instructions

before continuing. Now, only the network configuration remains between you and the data.

Each meter ships with a default Slave Address. To identify this address, add “100” to the last two digits of the

unique serial number printed on the label. When installing a meter on a dedicated Modbus network with no

other slave devices, the global address 255 (0xFF) may also be used (see R123).

SN 123456

+100

156

3456

Figure 1: Example Default Address

WARNING:Before connecting a meter to an existing network, ensure the default Slave Address will not

conflict! If necessary, select an alternate seed address with the Setup Button interface (see Installation

Instructions). Regardless of whether the default Slave Address, the global address, or an alternate seed

address is used, the meter may be programmed with any supported address after an initial connection is

established (see R123).

Leave the meter in the default factory mode for automatic network configuration:

•Automatic Baud Rate detection (see R114, R124): 9600 – 115200 baud

•Automatic Parity detection (see R116, R126): Even, Odd, No Parity

•Automatic Data Bits detection (see R117, R127): 7, 8 Bits

•Automatic Protocol detection (see R112, R122): Modbus RTU, ASCII

EM-RS485 Modbus Protocol Guide Page 7 of 52 154-0023-0B

To begin automatic configuration, simply connect the RS485 terminals to an active Modbus network. An

active Modbus network consists of a Modbus master device that regularly polls at least one Modbus slave

(whether the slave replies or not).

IMPORANT: If a Modbus network has devices communicating with multiple baud rates and/or formats,

the automatic configuration result is unpredictable. Set the configuration manually with the Setup Button

interface (see Installation Instructions) before connecting the meter in such an environment.

Once connected, the meter observes RS485 activity to learn baud rate, serial format, and protocol. Without

activity, the meter cannot learn! The meter will not interfere with existing network traffic during the

observation phase. As configuration proceeds, the RS485 Status LED indicates progress with a combination

of color and blinking activity patterns. Diagnostic mode conditions can help identify the current auto

configuration step (see Figure 2, and also the Installation Instructions).

Waiting For

Activity

Detecting

Baud Rate

Detecting

Protocol Re ady

Figure 2: Automatic Configuration Conditions

The RS485 Status LED turns green after at least one full frame successfully passes a CRC* integrity test.

Assuming no conflicts, the master can then use Modbus functions to query or configure registers.

The meter stores any discovered automatic configuration result in non-volatile memory and reloads them

whenever the meter resets (e.g. after power loss). The automatic configuration can be cleared by holding

down the Setup Button while resetting the meter (e.g. removing and reapplying power). User-configured

parameters will not be affected, but the meter must redetect any missing parameters before reestablishing

communication.

For permanent installations, the protocol configuration parameters (see R122 – R128) may be set to lock the

baud rate, format, and protocol. However, this will prevent the meter from adapting to future changes in

the network environment.

The EM-RS485 supports the following Modbus device functions:

•0x08 Diagnostics

•0x11 Report Server ID

*Cyclical Redundancy Check

EM-RS485 Modbus Protocol Guide Page 8 of 52 154-0023-0B

Holding Registers

The EM-RS485 supports the following Modbus functions:

•0x03Read Holding Registers

•0x06 Write Single Register

•0x10 Write Multiple Registers

In this document, Modbus addresses (beginning with “R”) represent raw protocol addresses. Some Modbus

conventions offset protocol addresses to form a register ID (e.g. 40001, Modicon notation). Refer to the

relevant controller documentation to determine any required programming offset for each installation.

Constructed registers (see Data Types) span multiple Modbus address. The notation RXX/YY specifies a pair

of aligned registers. The notation RXX-YY specifies a range of consecutive registers, inclusive.

Unless otherwise specified, changes to RS485 parameters are effective after the response (i.e. a client must

maintain the original parameters for the remainder of the current transaction).

System Configuration

R102 Reset Reason UINT16 R

Returns a reason determined at the time of the last reset:

1. Configuration Reset (see R190)

2. (reserved)

3. Power Loss

4. (reserved)

5. Hardware Watchdog

R103 Reset Count UINT16 R/NV

Returns a lifetime count of firmware resets for any reason. The meter maintains this count in a

protected section of non-volatile memory unaffected by Configuration Reset (see R190).

At each reset, the meter restores accumulated energy, demand statistics, and pulse input counts

from non-volatile memory. However, all the analog statistics reset, plus the Up Time (see R104),

Energy Timestamp (see R174), and pulse input Elapsed Active Time (see R212).

R104/05 Up Time UINT32 R

Returns the time since the last meter reset, in seconds. To determine the cause, read R102.

R111 Identify Meter BOOL R/W

Sets the LED status interface into a visually identifiable mode:

0. Inactive

1. Active

When set to Active, all status LEDs (see Installation Guide) begin slowly blinking green together.

This pattern is distinct from any other interface pattern the meter may display during normal

operation. The LEDs will remain in identify mode until the reset to Inactive or the Setup Button is

pressed.

This feature may be useful if several meters are connected on a single network and the association

between discovered device IDs and physical meters is uncertain.

Default: Inactive (normal LEDs)

EM-RS485 Modbus Protocol Guide Page 9 of 52 154-0023-0B

R112 Auto Protocol BOOL R/W/NV

Sets the state of automatic protocol detection:

0. Inactive

1. Active

When Active, the RS485 receiver initially allows frames of any supported protocol. On establishing

confidence in a particular protocol (about 10 consecutive frames of the same type), this becomes

the preferred RS485 Protocol (see R122).

Generally, having a preferred protocol disallows other protocols. This reduces uncertainty in the

unlikely event that a particular frame or sequence could be interpreted as more than one protocol.

However, should the protocol really change (e.g. by moving the meter to a different network), the

meter will eventually lose confidence in the preferred protocol. After temporarily allowing all

protocols, automatic protocol detection will establish a new preference. To avoid the delays

associated with changing protocol, set the RS485 Protocol to some option that permanently allows

multiple protocols.

When changing this value, the meter keeps the current RS485 Protocol to avoid communication

loss. Setting Inactive disables further automatic protocol changes and only allows the protocol(s)

specifically set in RS485 Protocol.

Default: Active

R114 Auto Baud Rate BOOL R/W/NV

Sets the state of automatic baud rate detection:

0. Inactive

1. Active

When Active, the meter may automatically change the Baud Rate (see R124) in response to RS485

communication errors. When changing this value, the meter always keeps the current Baud Rate to

avoid communication loss.

Default: Active

R116 Auto Parity BOOL R/W/NV

Sets the state of automatic parity detection:

0. Inactive

1. Active

When Active, the meter may automatically change the Parity (see R126) in response to RS485

communication errors. When changing this value, the meter always keeps the current Parity to

avoid communication loss.

Default: Active

R117 Auto Data Bits BOOL R/W/NV

Sets the state of automatic data bits detection:

0. Inactive

1. Active

When Active, the meter may automatically change the Data Bits (see R127) in response to RS485

communication errors. When changing this value, the meter always keeps the current Data Bits to

avoid communication loss.

Default: Active

EM-RS485 Modbus Protocol Guide Page 10 of 52 154-0023-0B

R118 Auto Stop Bits BOOL R/W/NV

Sets the state of automatic stop bits:

0. Inactive

1. Active

Returns Active when Stop Bits is Auto (see R128).

Default: Active

R122 RS485 Protocol UINT16 R/W/NV

Sets the communication protocol(s):

1. Auto

2. BACnet

3. Modbus RTU

4. Modbus ASCII

5. BACnet and Modbus RTU

6. BACnet and Modbus ASCII

7. Modbus RTU and ASCII

8. Any Protocol

If Auto Protocol is Active (see R112), returns the auto-detected protocol (typically Modbus RTU or

Modbus ASCII). Otherwise, returns the user-configured protocol option.

Setting any value other than Auto also sets Auto Protocol to Inactive. Setting Auto copies any

previously set protocol option to the automatic protocol detector, and sets Auto Protocol to Active.

Setting an option with multiple protocols (5 – 8) reduces the Auto Protocol re-detection delay.

Default: Auto

R123 Slave Address UINT16 R/W/NV

Sets the Modbus slave address, 1 – 254.

Assign unique addresses to each Modbus slave device on a network. The Modbus specification

only allows slave addresses 1 – 247. Although the meter supports the assignment of reserved

addresses 248 – 254, undefined network behavior may result.

In the default configuration, returns the factory default slave address (see Configuration).

Otherwise, returns the user-configured slave address. Before setting the address, ensure that the

new address will not conflict with any other slave devices on the Modbus network.

In addition to the assigned slave address, the meter will respond to Modbus commands addressed

to the global address 255 (0xFF). Only use this address if the meter is installed on a dedicated

Modbus network with no other slave devices.

Default: Varies

R124/25 RS485 Baud Rate UINT32 R/W/NV

Sets the communication baud rate, 1200 – 460800.

When Auto Baud Rate is Active (see R114), returns the auto-detected baud rate (see Configuration).

Otherwise, returns the user-configured baud rate.

Almost by definition, successfully reading baud rate implies a correct value, with no further action

required. However, when transitioning a Modbus network to a new baud rate, it may be useful to

remotely configure the new baud rate before transitioning the gateway/controller. Setting any

user-configured baud rate also sets Auto Baud Rate to Inactive.

WARNING: The meter provides no facility to revert the baud rate remotely. Once written, the

meter will lose communication until the client baud rate matches the new configuration.

Default: Varies

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