SDM320C Single phase Din Rail Energy Meter with RS485 Modbus
Contents
1. HEX OxOf Send 01 10 00 OF 00 01 02 00 OF CRCLCRCH Receive 01 10 00 OF 00 01 CRCL CRCH How to change Baud rate Send 01 10 F8 00 00 01 02 XX XX CRCL CRCH XX XX 00 01 Baud rate 1200 XX XX 00 02 Baud rate 2400 XX XX 00 03 Baud rate 4800 XX XX 00 04 Baud rate 9600 Receive 01 10 F8 00 00 01 CRCL CRCH 1 10 Technical support Any questions please contact 0086 573 83698881 0086 573 83698883 www eastrongroup com Email sales eastrongroup com JIAXING EASTRON ELECTRONIC INSTRUMENTS CO TLD Address No 1369 Chengnan Road Nanhu Jiaxing Zhejiang China Tel 86 573 83698881 83698882 Fax 86 573 83698883 Email sales eastrongroup com Web www eastrongroup com2. eight bits of a 16 bit number representing the first register requested in the query Second Register Hi The top most significant eight bits of a 16 bit number representing the second register requested in the query Second Register Lo The bottom least significant eight bits of a 16 bit number representing the second register requested in the query Error Check Lo The bottom least significant eight bits of a 16 bit number representing the error check value Error Check Hi The top most significant eight bits of a 16 bit number representing the error check value JIAXING EASTRON ELECTRONIC INSTRUMENTS CO TLD Address No 1369 Chengnan Road Nanhu Jiaxing Zhejiang China Tel 86 573 83698881 83698882 Fax 86 573 83698883 Email sales eastrongroup com Web www eastrongroup com Single phase din rail meter SDM320C user manual 1 9 3 2How to communicate with SDM320C meter This part describes the register map for SDM 320C the function codes 0x03 to read register and 0x10 to write register Address hex Length Parameters Access R W _ Data Format OxO11E Total Energy R HEX Kwh 100 0x000F Modbus ID 0xF800 Example How to Read Total Energy Send 01 03 01 1E 00 02CRCL CRCH Receive 01 03 04 XX XX XX XX CRCL CRCH XX XX XX XX is Energy information if XX XX XX XX 00 00 00 FF The 00 OO OO FF converted into decimal 255 So Total Energy is255 100 2 55Kwh How to change 01 to 15 First 15 converted into
3. operation For this external voltage source the voltage Ui should is 5 27V DC and the maximum input current Imax is 27MA DC To connect the impulse output connect 5 27V DC to connector 6 anode and the signal wire S to connector 5 cathode The meter pulses is indicated on the front panel Communication port SDM320C has equipped a far infrared port and a RS485 port we can program the meter s operation data or reading via these 2 ports The communication protocol conforms MODBUS RTU protocol Far infrared communication port The far infrared communication port is on the left of LCD screen It is infrared wireless communication port The TP800 hand held programmer can directly communicate the data between the meter and this port The data transmission speed is 1200bps default 9600bps option The communication distance is no more than 5m Rs485 output RS485 communication port is between the meter terminal 8 and 7 It is a synchronization wire port Installing a software in PC via RS485 adapter Connecting the terminal 8 and 7 PC can communicate with the meter immediately 1 9 Protocol SDM320C has a RS485 port with Modbus RTU protocol RS485 is a balanced line half duplex transmission system allowing transmission distances of up to 1 km The following table summarizes the RS485 Standard PARAMETER a Mode of Operation Differential Number of Drivers and Receivers 32 Drivers 32 Receivers Minimum Driver Output Levels uploa
4. the data being requested As registers are used in pairs and start at zero then this must be an even numberNumber of Points Hi The top most significant eight bits of a 16 bit number specifying the number of registers being requested Number of Points Lo The bottom least significant eight bits of a 16 bit number specifying the number of registers being requested As registers are used in pairs then this must be an even number Error Check Lo The bottom least significant eight bits of a 16 bit number representing the error check value Error Check Hi The top most significant eight bits of a 16 bit number representing the error check value Response The example illustrates the normal response to a request for two 16 bit Modbus Protocol Registers First Last Byte Byte Slave Functio First First Second Second Address n Code Register Register Register Register Hi Lo Hi Lo Slave Address 8 bit value representing the address of slave that is responding Function Code 8 bit value which when a copy of the function code in the query indicates that the slave recognised the query and has responded See also Exception Response Byte Count 8 bit value indicating the number of data bytes contained within this response First Register Hi The top most significant eight bits of a 16 bit number representing the first register requested in the query First Register Lo The bottom least significant
5. the protection cover is placed after installation Installation maintenance and reparation should only be done by qualified personnel Never break the seals and open the front cover as this might influence the function of the meter and will cause no warranty Do not drop or allow strong physical impact on the meter as the high precisely components inside may be damaged 44 4444 JIAXING EASTRON ELECTRONIC INSTRUMENTS CO TLD Address No 1369 Chengnan Road Nanhu Jiaxing Zhejiang China Tel 86 573 83698881 83698882 Fax 86 573 83698883 Email sales eastrongroup com Web www eastrongroup com Single phase din rail meter SDM320C user manual 1 2 Introduction The Eastron SDM320C DIN rail single phase two wire energy meter with modbus protocol Output is LCD displayed based on kWh and the data can be transported by isolated RS485 The meter is provided with a non volatile memory system that ensures that the readings are not lost or altered when power off The meter allows up to 100A direct load in single phase application It is perfect measuring instruments for AMR system or Energy monitoring and control system 1 3 Performance criteria Operating humidity Storage humidity 2 Operating temperature Storage temperature International standard IEC 62053 21 Accuracy class 0 5 or 1 0 Protection against penetration of dust and water IP51 Insulating encased meter of protective class 1 4 Meter specifications Meter
6. voltage sensing device to confirm that power is off Installation should be performed by qualified personnel familiar with applicable codes and regulations Use isolated tools to install the meter Fuse or thermal cut off or single pole circuit breaker can t be fitted on the Supply line and not the neutral line Don t put your finger into the hole because there is a screw inside Please choose the available adapter which is supplied with the meter to suit the diameter of the cable lt We recommend that the connecting wire which is used to connect the meter to the outside circuit should be sized according to local codes and regulations for the amp city of the circuit breaker or over current device used in the circuit lt An external switch or a circuit breaker should be installed on the inlet wire which will be used as a disconnection device for the meter And there it is recommended that the switch or circuit breaker is JIAXING EASTRON ELECTRONIC INSTRUMENTS CO TLD Address No 1369 Chengnan Road Nanhu Jiaxing Zhejiang China Tel 86 573 83698881 83698882 Fax 86 573 83698883 Email sales eastrongroup com Web www eastrongroup com Single phase din rail meter SDM320C user manual near the meter so that it is more convenience for the operator The switch or circuit breaker should comply with the specifications of the building electrical design and all local regulations lt An external fuse or thermal cut off which
7. Single phase din rail meter SDM320C user manual SDM320C DIN rail single phase two wire energy meter with RS485 MODBUS RTU Four modular User Manual Safety instruction Introductions Performance criteria Specifications Basic errors Dimension amp material Installation Operating Protocol O Technical support es a oo Me OcnN OO UB WN Fe JIAXING EASTRON ELECTRONIC INSTRUMENTS CO TLD Address No 1369 Chengnan Road Nanhu Jiaxing Zhejiang China Tel 86 573 83698881 83698882 Fax 86 573 83698883 Email sales eastrongroup com Web www eastrongroup com Single phase din rail meter SDM320C user manual 1 1 Safety instructions Information for Your Own Safety This manual does not contain all of the safety measures for operation of the equipment module device because special operating conditions and local code requirements or regulations may necessitate further measures However it does contain information which must be read for your personal safety and to avoid material damages This information is highlighted by a warning triangle and is represented as follows depending on the degree of potential danger Caution This means hazard of electric shock and failure to take the necessary safety Warning This means that failure to observe the instruction can result in death serious injury or considerable material damage A precautions will result in death serious injury or considerable material damage Qualified
8. contains the device or broadcast address a function code defining the requested action any data to be sent and an error checking field The response contains fields confirming the action taken any data to be returned and an error checking field If an error occurred in receipt of the message then the message is ignored if the slave is unable to perform the requested action then it will construct an error message and send it as its response The following example illustrates a request for two 16 bit Modbus Protocol Registers JIAXING EASTRON ELECTRONIC INSTRUMENTS CO TLD Address No 1369 Chengnan Road Nanhu Jiaxing Zhejiang China Tel 86 573 83698881 83698882 Fax 86 573 83698883 Email sales eastrongroup com Web www eastrongroup com Single phase din rail meter SDM320C user manual First Last Slave Function Start Start Address Code Address Address Hi Slave Address 8 bit value representing the slave being addressed 1 to 255 O is reserved for the broadcast address The Integra Digital meters do not support the broadcast address Function Code 8 bit value telling the addressed slave what action is to be performed 3 4 8 or 16 are valid for Integra Digital meter Start Address Hi The top most significant eight bits of a 16 bit number specifying the start address of the data being requested Start Address Lo The bottom least significant eight bits of a 16 bit number specifying the start address of
9. ded Minimum 60 ohms Driver Output Short Circuit Current Limit 150mA to Gnd 250mA to 12V 250mA to 7V Minium Receiver Input Resistance 12Kohms Receiver Sensitivity 200mV Further information relating to RS485 may be obtained from either the Eastron or the various RS485 JIAXING EASTRON ELECTRONIC INSTRUMENTS CO TLD Address No 1369 Chengnan Road Nanhu Jiaxing Zhejiang China Tel 86 573 83698881 83698882 Fax 86 573 83698883 Email sales eastrongroup com Web www eastrongroup com Single phase din rail meter SDM320C user manual device manufacturers for example Texas Instruments or Maxim Semiconductors This list is not exhaustive 1 9 1 Half Duplex Half duplex is a system in which one or more transmitters talkers can communicate with one or more receivers listeners with only one transmitter being active at any one time For example a conversation is started by asking a question the person who has asked the question will then listen until he gets an answer or until he decides that the individual who was asked the question is not going to reply In a 485 network the master will start the conversation witha query addressed toa specific slave the master willthen listen forthe slave s response Ifthe slave does not respond within a pre defined period set by control software inthe master the master will abandon the conversation 1 9 2 Connectin
10. g the Instruments If connecting an RS485 network to a PC use caution if contemplating the use of an RS232 to 485 converter together with a USB to RS485 adapter Consider either an RS232 to RS485 converter connected directly to a suitable RS232 jack on the PC or use a USB to RS485 converter or for desktop PCs a suitable plug in RS485 card Many 232 485 converters draw power from the RS232 socket If using a USB to RS232 adapter the adapter may not have enough power available to run the 232 485 converter Screened twisted pair cable should be used For longer cable runs or noisier environments use of a cable specifically designed for RS485 may be necessary to achieve optimum performance All A terminals should be connected together using one conductor of the twisted pair cable all B terminals should be connected together using the other conductor in the pair The cable screen should be connected to the Gnd terminals A Belden 9841 Single pair or 9842 Two pair or similar cable with a characteristic impedance of 120 ohms is recommended The cable should be terminated at each end with a 120 ohm quarter watt or greater resistor Note Diagram shows wiring topology only Always follow terminal identification on Integra Digital meter product label Integra Integra Integra slave Slave Master 120 ohm 120 ohm There must be no more than two wires connected to each terminal this ensures thata Daisy Chain o
11. is a red LED which is used as indicating power consumption in the front panel of SDM 320C When consumption happens the LED will flash The more quickly LED flashes the more consumption there is For this LED the flash rate is indicated per kWh on the front panel Reverse indication There is a red LED which is used as indicating current reverse in the front panel Communication indication On the front panel of SDM320C there is a COM LED When the data communicate between the far infrared port or RS485 port with outside equipment the LED will blink JIAXING EASTRON ELECTRONIC INSTRUMENTS CO TLD Address No 1369 Chengnan Road Nanhu Jiaxing Zhejiang China Tel 86 573 83698881 83698882 Fax 86 573 83698883 Email sales eastrongroup com Web www eastrongroup com Single phase din rail meter SDM320C user manual Reading the meter The SDM 320C energy meter is equipped with 6 1 or 5 2 LCD display which is used as recording consumption and can t be reset to zero The number system is based on units of 10 And unit is kWh Another way through RS485 and PC software or HHU hand held unit unit can read power consumption Pulse output The SDM320C DIN rail energy meter is equipped with a pulse output which is fully separated from the inside circuit That generates pulses in proportion to the measured energy for accuracy testing The pulse output is a polarity dependant passive transistor output requiring an external voltage source for correct
12. personnel Operation of the equipment module device described in this manual may only be performed by qualified personnel Qualified personnel in this manual means person who are authorized to commission start up ground and label devices systems and circuits according to safety and Regulatory standards Use for the intended purpose The equipment device module may only be used for the application specified in the catalogue and the user manual and only be connected with devices and components recommended and approved by Eastron Proper handling The prerequisites for perfect reliable operation of the product are proper transport proper storage installation and proper operation and maintenance When operating electrical equipment parts of this equipment automatically carry dangerous voltages Improper handling can therefore result in serious injuries or material damage Use only insulating tools Do not connect while circuit is live hot Do not connect the meter to a 3 phase 400VAC network Place the meter only in dry surroundings Do not mount the meter in an explosive area or expose the meter to dust mildew and insects Make sure the wires are suitable for the maximum current of this meter Make sure the AC wires are connected correctly before activating the current voltage to the meter Do not touch the meter connecting clamps directly with metal blank wire and your bare hands as you may get electrical shock Make sure
13. r straight line configuration is used A Star ora network with Stubs Tees is not recommended as reflections within the cable may result in data corruption JIAXING EASTRON ELECTRONIC INSTRUMENTS CO TLD Address No 1369 Chengnan Road Nanhu Jiaxing Zhejiang China Tel 86 573 83698881 83698882 Fax 86 573 83698883 Email sales eastrongroup com Web www eastrongroup com Single phase din rail meter SDM320C user manual Daisy Chained Connection Correct star Connection WRONG stub Connection WRONG Communication on a MODBUS Protocol Network is initiated started bya Master sending a query toa Slave The Slave which is constantly monitoring the network for queries addressed to it will respond by performing the requested action and sending a response back to the Master Only the Master can initiate a query 1 9 3 MODBUS Protocol General Information Slave 1 Slave 2 Slave 3 Slave n Master m Response In the MODBUS Protocol the master can address individual slaves or using a special Broadcast address can initiate a broadcast message to all slaves The Integra Digital meter do not support the broadcast address 1 9 3 1MODBUS Protocol Message Format There are two MODBUS Protocol serial transmission modes ASCII and RTU 320c Meter support the support mode The MODBUS Protocol defines the format for the master s query and the slave s response The query
14. type SDM320C LCD display Nominal voltage Un 230V AC 110V AC Operational voltage 0 7 1 3Un Insulation capabilities AC voltage withstand 2KV for 1 minute Impulse voltage withstand 6kV 1 2uS waveform Basic current Ib 1 5A 5A 10A Maximum rated current Imax 6A 60A 100A Operational current range 0 4 Ib Imax Over current withstand Operational frequency range Internal power consumption Test output flash rate RED LED Pulse output rate pins 5 amp 6 reverse indicator RED LED Consumption indicator RED LED Communication indicator GREEN LDE Data communication port 1 4 1 RS485 communication specifications Bus type RS485 protocol MODBUS RTU baud rate 1200 default 2400 4800 9600bps 1 247 user settable OZ OSS Address range 1 247 user settable Bus Loading 64 meters per bus Rage 1000M Parity EVEN default ODD NONE AS U Stop bit 1 Data bits BE JIAXING EASTRON ELECTRONIC INSTRUMENTS CO TLD Address No 1369 Chengnan Road Nanhu Jiaxing Zhejiang China Tel 86 573 83698881 83698882 Fax 86 573 83698883 Email sales eastrongroup com Web www eastrongroup com Single phase din rail meter SDM320C user manual 1 5 Infrared communication specifications Infrared wavelengths 900 1000nm 1200bps default eM Communication distance 5m Communication angle 15 15 1 6 Dimensions 1 7 Installation Turn off all the power before working on it Always use a properly rated
15. will be used as a over current protection device for the meter must be installed on the supply side wire and it is recommended that the over current protection device is near the meter so that it is more convenience for the operator The over current protection device should comply with the specifications of the buildings electrical design and all local regulations This meter can be installed indoor directly or in a meter box which is waterproof outdoor subject to local codes and regulations To prevent tampering secure the meter with a padlock or a similar device The meter has to be installed against a wall which is fire resistant The meter has to be installed in a good ventilated and dry place The meter has to be installed in a protection box when placed in dangerous or dusty environment The meter can be installed and used after being tested and sealed with a letter press printing The meter can be installed on a 35mm DIN rail or direct on a meter board with screws The meter should be installed in an available height so that it is easy to read When the meter is installed in an area with frequent surges due to e q thunderstorms welding machines inverters etc protect the meter with Surge Protection Devices lt After installation the meter must be sealed to prevent tampering oooeoeooo 4 Connection of the wires should be done in accordance with the underneath connection diagram 1 8 Operating Consumption indication There
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