MODBUS RTU COMMUNICATION MODULE FOR PT-9000 MODEL PT-NT4-M

MODBUS RTU COMMUNICATIONMODULE FOR PT-9000MODEL PT-NT4-MDESCRIPTIONThe PT-NT4-M is the Modbus RTU CommunicationModule for the PowerTrak PT-9000 Power MonitoringInterface. The PT-NT4-M reads data from the PT-9000ʼsmain processor, formats it, and transmits the data to aModbus network using the Modbus RTU system communications protocol. The PT-NT4-M allows all of the powersystem parameters measured by the PowerTrak to bemonitored over a single pair of wires using an RS-485half-duplex with selectable baud rate and parity.Because the PT-NT4-M is designed to meet ModbusRTU Network Guidelines, multiple PowerTraks can beconnected with other Modbus RTU devices on the samenetwork.FEATURES Monitors all PowerTrak parameters over a singlepair of wires Allows remote reset of KWH and Peak KWparameters RS-485 half-duplex with selectable baud rate Optically isolated RS-485 eliminates networkgrounding concerns Pluggable field-wiring screw terminals Status and network LED indicators Factory or field installation to any PT-9000SPECIFICATIONSWIRINGPower supplyNone required (powered byPT-9000)NetworkModbus RTU protocol. RS-485half-duplex, selectable baud rateand parityField wiringPluggable screw terminalsDimensions4.5"H x 2.6"W x 0.6"D(11.4 x 6.6 x 1.5 cm)Operating environment Indoors, do not expose to directsunlight or corrsive/explosivegassesOperating temperature-10 50 C (14 122 F)Storage temperatureHumidity-40 85 C (-40 185 F)0% 95% noncondensingAgency ApprovalsUL, RoHS, Certified to ModbusRTU GuidelinesWeight0.1 lb (0.05kg)KELE www.kele.com FAX 800-284-5353USA 888-397-5353 International 901-382-6084July 2010

INSTALLATION OF THE PT-NT4-M MODULEIf the PT-NT4-M option was ordered with the PT-9000, it will be pre-installed at Kele. If the PT-NT4-M is to be fieldinstalled, follow these steps:The main processor firmware must be at least Revision 1.3 for use with the PT-NT4-M option. If the label on themain processor (large 40-pin IC chip in the middle of PT-9000ʻs upper board) shows a revision level less than 1.3,contact Kele to send an updated processor.Ground yourself before removing the PT-NT4-M module from its anti-static bag. The PT-NT4-M module is staticsensitive!Lower the PT-NT4-M board assembly over the two standoffs on the lower right corner of the PT-9000 subbase.Orient the assembly so that the ribbon cable is in the upper left corner. Install the two screws to secure the PT-NT4M board to the standoffs.Turn off the PT-9000 power using the System Voltage Select Switch. Plug the ribbon cable header of the PT-NT4-Minto the “Network Option” socket on the PT-9000 main processor board.Turn the PT-9000 power back on. Connect the Modbus RTU Communication network wires to the terminal block onthe lower right corner of the PT-NT4-M board. The RS-485 transceiver is optically isolated from the PT-9000 powerterminals and earth ground, eliminating problems with differences in the reference voltage between Modbus RTUnodes.This completes installation of the PT-NT4-M Modbus RTU Communication Module.STATUS LED INDICATIONThe PT-NT4-M contains several different LED indicators, each of which conveys important information about thestatus of the unit and the Modbus RTU network. These LEDs and their functions are summarized here.MODULE STATUSThe PT-NT4-M has one dichromatic (red/green) LED to indicate the status of the module located in the lower left-handside of the PT-NT4-M. On startup, the LED blinks a startup sequence: green red green red. Always confirm thissequence upon powering the PT-9000 to ensure the PT-NT4-M is functioning properly.Solid greenThe module status LED lights solid green when the PT-NT4-M has power and is functioningnormally.Flashing redIf a fatal error occurs, the module status LED will flash a red error code. The number of sequential blinks (followed by 2 seconds of OFF time) indicates the error code.Modbus RTU Network StatusThe PT-NT4-M has one red and one green LED located to the left of the network terminal block which indicate thestatus of the BACnet MS/TP network communications.Green (TX) LEDLights when the PT-NT4-M is transmitting data on the Modbus RTU network.Red (RX) LEDLights when the PT-NT4-M is receiving data on the Modbus RTU network. Note that this doesnot indicate the validity of the data; only that data exists and is being detected. Also note thatthe RX LED will light in conjunction with the TX LED (as transmitting devices on 2-wire RS-485networks also receive their own transmissions).KELE www.kele.com FAX 800-284-53532USA 888-397-5353 International 901-382-6084

ASSIGNMENT OF THE PT-NT4-M ADDRESS AND DEVICE INSTANCEThe Modbus RTU protocol requires that each device on the network has a unique address. To assign the deviceaddress for the PowerTrak, use Dip switch 1 on the left side of the PT-NT4-M board. Allowable addresses are from1 to 247. Select an appropriate and available address for the network on which the PowerTrak will be installed (SeeTable 1). Address changes will take effect after power cycling the PowerTrack.Table 1: Address Settings (DIP Switch 1)DIP Switch "D"Address 0 OFF 1 ON1234 56780000 0515253545556575859606162630001 001101111011110010 001101111011110011 119120121122123124125126127KELE www.kele.com FAX 800-284-5353DIP Switch "D"0 OFF 1 ON1234 56780100 001101111011110101 001101111011110110 001101111011110111 71881891901913DIP Switch "D"0 OFF 1 ON1234 56781000 001101111011111001 001101111011111010 001101111011111011 235236237238239240241242243244245246247DIP Switch "D"0 OFF 1 ON1234 56781100 001101111011111101 001101111011111110 001101111011111111 00000001001000110100010101100111USA 888-397-5353 International 901-382-6084

DIP SWITCH 2 OPEN COMMUNICATIONSON ON ON ON ON ON ON ON12Baud RateSelection345ParitySelectionReturnedData Order6Not Used7Not Used8ASSIGNMENT OF THE PT-NT4-M BAUD RATETo assign the baud rate for the PowerTrak, use dip switch 2on the left side of the PT-NT4-M board. Available baud ratesare from 2400 to 115200 baud. Select an appropriate baudrate for the network to which the PowerTrak will be installed(See Table 2). Baud rate changes will take effect after powercycling the PowerTrackTable 2: Baud Rate Settings (Dip Switch 2)Baud RateDIP Switch 20 OFF 1 76800110115200111PARITYTo change Parity use dip switch 2 on the left side of the PT-NT4-M board. If even or odd parity is selected, thePT-NT4-M uses one stop bit per the Modbus RTU specification. If no parity, two stop bits is selected, thePT-NT4-M transmits two stop bits per the Modbus RTU specification. If no parity, one stop bit is selected, thePT-NT4-M will accept polls with one stop bit (not a specified mode in the Modbus RTU specifications) since somemasters use no parity, one stop bit. (Table 3)Table 3: Parity/Stop Bit SettingSwitch 40011KELE www.kele.com FAX 800-284-5353Switch 50101Parity/Stop Bit SettingNo Parity/One Stop BitOdd Parity/One Stop BitEven Parity/One Stop BitNo Parity/Two Stop Bits4USA 888-397-5353 International 901-382-6084

MODBUS POINT 340046STARTINGADDRESSIN DESCRIPTION (all 32-bit IEEE floating FPFDIP Switch E,Switch 3 Off(Upper 16 bits)Phase A KVA(Lower 16 bits)Phase A KVA(Upper 16 bits)Phase B KVA(Lower 16 bits)Phase B KVA(Upper 16 bits)Pahse C KVA(Lower 16 bits)Phase C KVA(Upper 16 bits)Total KVA(Lower 16 bits)Total KVA(Upper 16 bits)Phase A KW(Lower 16 bits)Phase A KW(Upper 16 bits)Phase B KW(Lower 16 bits)Phase B KW(Upper 16 bits)Phase C KW(Lower 16 bits)Phase C KW(Upper 16 bits)Total KW(Lower 16 bits)Total KW(Upper 16 bits)KW Peak Demand(Lower 16 bits)KW Peak Demand(Upper 16 bits)KW Sliding Window(Lower 16 bits)KW Sliding Window(Upper 16 bits)Phase A Amps(Lower 16 bits)Phase A Amps(Upper 16 bits)Phase B Amps(Lower 16 bits)Phase B Amps(Upper 16 bits)Phase C Amps(Lower 16 bits)Phase C Amps(Upper 16 bits)Average Amps(Lower 16 bits)Average Amps(Upper 16 bits)Phase A Volts(Lower 16 bits)Phase A Volts(Upper 16 bits)Phase B Volts(Lower 16 bits)Phase B Volts(Upper 16 bits)Phase C Volts(Lower 16 bits)Phase C Volts(Upper 16 bits)Average Volts(Lower 16 bits)Average Volts(Upper 16 bits)Kilowatt Hours(Lower 16 bits)Kilowatt HoursPhase A Power Factor (Upper 16 bits)Phase A Power Factor (Lower 16 bits)Phase B Power Factor (Upper 16 bits)Phase B Power Factor (Lower 16 bits)Phase C Power Factor (Upper 16 bits)Phase C Power Factor (Lower 16 bits)(Upper 16 bits)Total Power Factor(Lower 16 bits)Total Power FactorDIP Switch E,Switch 3 On(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)(Lower 16 bits)(Upper 16 bits)NOTES:NOTES11, 21, 2, 3––11, 21, 2, 3––––––––22, 31. Point not valid for three-phasedelta power system.2. Point not valid for one-phasetwo-wire power system.3: Point not valid for one-phasethree-wire power system.4. L1 to L2 volts on three-phasedelta or L1 to N volts on threephase wye, one-phase threewire, one-phase two-wire.5. L2 to L3 volts on three-phasedelta or L2 to N volts on threephase wye, one-phase threewire.6. L3 to L1 volts on three-phasedelta or L3 to N volts on threephase wye.––42, 52, 3, 6––––11, 21, 2, 3––Objects are read using FunctionCode 3 (read holding registers).The read function must specify aneven starting address and aneven number of registers, or elsean error (exception) code will bereturned. As shown in the tableabove, there are two possiblearrangements for the returneddata. If DIP Switch 2, SW6 is off,the high 16 bits of the float arereturned first. If DIP Switch 2,SW6 is on, the low 16 bits of thefloat are returned first. This optionis included because a master mayexpect the data in either order.CLEARING PEAK DEMANDThe PT-9000 peak demand object may be cleared by the following command only, or else an error (exception) codewill be returned:Use the “Preset Multiple Registers” command (command 16) to write zero values to registers 40017 and 40018.CLEARING KWH AMOUNTThe PT-9000 KWH count may be cleared by the following command only, or else an error (exception) code will bereturned:Use the “Preset Multiple Registers” command (command 16) to write zero values to registers 40037 and 40038.KELE www.kele.com FAX 800-284-53535USA 888-397-5353 International 901-382-6084

Power supply None required (powered by PT-9000) Network Modbus RTU protocol. RS-485 half-duplex, selectable baud rate and parity Field wiring Pluggable screw terminals Dimensions 4.5"H x 2.6"W x 0.6"D (11.4 x 6.6 x 1.5 cm) Operating environment Indoors, do not expose to direct sunlight or corrsive/explosive gasses