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SERIAL CONNECTION EXAMPLES

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Содержание LAUREATE 2 Series

Страница 1: ... 1 LAUREATE SERIES 2 DIGITAL PANEL METER OWNERS MANUAL Now with Ethernet LAUREL Electronics Inc 3183 G Airway Ave Costa Mesa CA 92626 USA Tel 714 434 6131 Fax 714 434 3766 Website www laurels com ...

Страница 2: ...C427F Cu10 143 to 500 F Thermocouples JC 210 to 760 C JF 347 to 1400 F KC 244 to 1372 C KF 408 to 2501 F TC 257 to 400 C TF 430 to 752 F EC 240 to 1000 C EF 400 to 1830 F NC 245 to 1300 C NF 410 to 2370 F SC 46 to 1768 C SF 51 to 3214 F RC 45 to 1768 C RF 49 to 3213 F Resistance Ohms R0 0 2 ohms fixed range R1 0 20 000 ohms R2 0 200 00 ohms R3 0 2 0000 kohms R4 0 20 000 kohms R5 0 200 00 kohms R6 ...

Страница 3: ...0 Meter Scaling Theory 13 11 DC Volts Amps Process Strain Input 14 12 Load Cell Microvolt Input 19 13 AC RMS Volts Amps Input 24 14 Thermocouple Input 30 15 RTD Resistance Input 34 16 Dual Quad Relay Output Options 39 17 Analog Output Option 42 18 Serial Communication Options 43 19 Excitation Output Power Supply 48 20 Instrument Setup Via PC 49 21 Custom Curve Linearization 52 22 Meter Calibration...

Страница 4: ...hind the panel Power and signal wiring is via removable plugs conforming to UL61010C safety stan dards All output options are isolated from meter and power ground to 250 Vac Extended meter versions can linearize nonlinear inputs Up to 180 data points may be linear ized by a computer program that stores setup parameters in nonvolatile memory Extended meters can also display time rate of change Alar...

Страница 5: ...r is connected The 85 264 Vac power connector P1 Pins 1 3 is colored Green to differentiate it from other input and output connectors The 12 32 Vac 10 48 Vdc power connector is colored Black Do not make signal wiring changes or connections when power is applied to the instrument Make signal connections before power is applied If reconnection is required disconnect power before such wiring is attem...

Страница 6: ...r RS232 dual RJ11 plugs for RS485 dual RJ45 plugs for RS485 Modbus or USB Warning Hazardous voltages may be present on pins 4 5 6 of P1 since digital ground is tied to pin 3 of P5 Signal Input Keep pin 3 close to earth ground to minimize common mode voltage or shock hazard at pins 4 5 6 of P1 Note The functions of control inputs 1 2 of P1 are menu selectable For 4 wire load cell connection jumper ...

Страница 7: ... 7 P3 SERIAL COMMUNICATIONS P4 ANALOG OUTPUT ...

Страница 8: ... for access to the appropriate menu items You may need to remove rear panel knockouts to fit new boards Note When an option board is installed correctly the top and bottom edges of the main board and option board are aligned Misaligned boards will burn out the electronics Option Board Main Board Plug Rear Panel Jack Power supply Relay board Serial interface board Analog output board Signal conditi...

Страница 9: ...l The meter is secured by two pawls each held by a screw Turning a screw clockwise extends the pawl outward Turning the screw clockwise further tightens it against the panel to secure the meter Turning a screw counterclockwise loosens the pawl and retracts it into its well This allows the meter to be inserted into the panel cutout for installation or to be removed from the panel cutout following i...

Страница 10: ...tarily advances to the next menu item Holding down a key automatically advances through multiple menu items for fast menu navigation KEYS IN RUN MODE MENU Key Pressing MENU from the Run Mode enters the Menu Mode Pressing MENU repeatedly will step the meter through the various menu items if these have not been locked out and then back to the Run Mode PEAK Key Pressing PEAK normally causes the peak ...

Страница 11: ...splayed you can press then simultaneously Again rESEt will be displayed briefly Right Triangle Key Digit Select Pressing from the InPut menu brings up all meter functions available with the meter s signal conditioner For example for the DC signal conditioner board these are _dC U _dC A and _rAtio Pressing from the SEtuP ConfFG FiLtr SCALE OFFSt Loc 1 Loc 2 or Loc 3 menus items sequentially selects...

Страница 12: ... are shipped with lockouts in place This causes menu items described later in this manual not to appear SETTING SOFTWARE LOCKOUTS To set up a meter it may be necessary to enable menu items by setting lockout digits to 0 Following setup reset the digits to 1 if you do not want the menu item to be changed by an operator Loc 1 Loc 2 Loc 3 Press the MENU key until Loc 1 Loc 2 or Loc 3 is displayed as ...

Страница 13: ... appears in the displayed reading For example 1000 display counts can be shown as 1 000 kg or 1000 grams The number of inputs counts is the integer number generated by analog to digital con version The maximum is 20 000 for full scale FS of all signal types and ranges except for the 50 000 mV load cell range where the maximum is 50 000 This means that one count is 1 µA for the 20 000 mA range whic...

Страница 14: ...ale factor to be set For example to display 500 0A 5000 output counts from a 100 mV shunt 10000 input counts in the 200 mV range apply a scale factor of 0 5 and an offset of 0 Three scaling methods are selectable 1 Scale and offset 2 Coordinates of 2 points and 3 Reading coordinates of 2 points Only menu items applicable to the selected method are presented For use with load cells select 5V or 10V...

Страница 15: ...d 1 Coordinates of 2 points method 2 Reading coordinates of 2 points method 00_00 Rear panel control inputs 1 2 True logic 1 0V or tied to digital ground False logic 0 5V or open 0 1 Reset 2 Meter Hold 1 1 Function Reset 2 Peak or Valley 2 1 Hold 2 Peak or Valley Display 3 1 Hold 2 Tare 4 1 Peak or Valley Display 2 Tare 5 1 Tare 2 Reset 6 1 1 2 1 decimal point XXXXX 1 0 2 1 decimal point XXXX X 1 ...

Страница 16: ...ing 0 Unfiltered Peak Valley 1 Filtered Peak Valley 00000 Display filtering 0 Display 16 reading batch average every 17 readings Updates display 3 5 times sec at 60 Hz 3 0 times sec at 50 Hz 1 Display per signal filter setting below 00000 Adaptive filter threshold for all filters 0 Low adaptive filter threshold level 1 High adaptive filter threshold level 00000 Input signal filter setting Can be a...

Страница 17: ...st digit 0 thru 9 for other flashing digits Decimal point is set by input range chosen Hi rd Desired reading at Hi In 0 0000 0 0000 0 0000 0 0000 0 0000 Select digit to flash Select 9 thru 9 for flashing first digit 0 thru 9 for other flashing digits Decimal point is set by dEC Pt Scaling method Reading coordinates of 2 points if selected under SEtuP When this method is selected the four menu item...

Страница 18: ...ess and load cell meters when known inputs are available It is also available for AC meters but not thermocouple or RTD meters Option board dependent menu items ALSEt ALS34 dEU1H dEU2H dEU1b dEU2b dEU3H DEU4H DEU3b DEU4b Menu items related to alarm setup These will only appear if a relay board is detected If so see Section 16 AnSEt An Lo An Hi Menu items related to analog output setup These will o...

Страница 19: ... a known weight are applied to the meter The corresponding desired low and high readings are then entered from the front panel The meter applies straight line fit between these low and high calibration points This scaling method has the advantage of calibrating the transducer and meter as a system The actual voltages or currents at the two endpoints do not need to be known This method can be used ...

Страница 20: ...ints method 2 Reading coordinates of 2 points method 00_00 Rear panel control inputs 1 2 True logic 1 0V or tied to digital ground False logic 0 5V or open 0 1 Reset 2 Meter Hold 1 1 Function Reset 2 Pk or Valley Disp 2 1 Meter Hold 2 Pk or Valley Disp 3 1 Meter Hold 2 Tare 4 1 Peak or Valley 2 Tare 5 1 Tare 2 Reset 6 1 0 2 0 decimal point 1 XXXXX 1 1 2 0 decimal point 1 XXXX X 1 0 2 1 decimal poi...

Страница 21: ...ing 0 Unfiltered Peak Valley 1 Filtered Peak Valley 00000 Display filtering 0 Display 16 reading batch average every 17 readings Updates display 3 5 times sec at 60 Hz 3 0 times sec at 50 Hz 1 Display per signal filter setting below 00000 Adaptive filter threshold for all filters 0 Low adaptive filter threshold level 1 High adaptive filter threshold level 00000 Input signal filter setting Can be a...

Страница 22: ...ru 9 for flashing first digit 0 thru 9 for other flashing digits Decimal point is set by input range chosen Hi rd Desired reading at Hi In 0 0000 0 0000 0 0000 0 0000 0 0000 Select digit to flash Select 9 thru 9 for flashing first digit 0 thru 9 for other flashing digits Decimal point is set by dEC Pt Scaling method Reading coordinates of 2 points if selected under SEtuP When this method is select...

Страница 23: ... use six wire hookup where the extra two wires are used to sense the excitation voltage at the load cell This allows ratiometric meter operation to correct for voltage drops in the excitation wires 3 Use twisted shielded wire from the meter to the load cell to minimize pickup of electrical noise Connect the shield to signal input ground at the meter Do not connect the other end of the shield 4 Do ...

Страница 24: ...s for it but it does not recognize the jumper settings These need to be set manually Please see further manual sections for relay output analog output communications and transducer excitation output RANGE SELECTION VIA JUMPERS 1 Letters indicate jumper position Jumpers are installed on pins adjacent to letters 2 Use 2 5 mm 0 1 jumpers 3 Store spare jumpers on unused jumper post SIGNAL CONNECTIONS ...

Страница 25: ...ust be reinstalled before closing the instrument SIGNAL SHIELDING Signal Source RMS Board Sig High Sig Low Earth Ground Shield around twisted pair Shielding for noise reduction AC RMS measurements are susceptible to signal noise This is especially true when the instru ment has a wide bandwidth To minimize noise pickup the input signal wiring should utilize a shielded twisted pair and the shield sh...

Страница 26: ...coordinates of 2 points method 00_00 Rear panel control inputs 1 2 Connections True logic 1 0V or tied to digital ground False logic 0 5V or open 0 1 Reset 2 Meter Hold 1 1 Function Reset 2 Pk or Valley Disp 2 1 Meter Hold 2 Pk or Valley Disp 3 1 Meter Hold 2 Tare 4 1 Peak or Valley 2 Tare 5 1 Tare 2 Reset 6 1 0 2 0 decimal point 1 XXXXX 1 1 2 0 decimal point 1 XXXX X 1 0 2 1 decimal point 1 XXX X...

Страница 27: ...filtering 0 Unfiltered Peak Valley 1 Filtered Peak Valley 00000 Display filtering 0 Display 16 reading batch average every 17 readings Updates display 3 5 times sec at 60 Hz 3 0 times sec at 50 Hz 1 Display per input signal filter setting below 00000 Adaptive filter threshold 0 Low adaptive filter threshold level 1 High adaptive filter threshold level 00000 Input signal filter setting Can be appli...

Страница 28: ...r flashing first digit 0 thru 9 for other flashing digits Decimal point is set by input range chosen Hi rd Desired reading at Hi In 0 0000 0 0000 0 0000 0 0000 0 0000 Select digit to flash Select 9 thru 9 for flashing first digit 0 thru 9 for other flashing digits Decimal point is set by dEC Pt Scaling method Reading coordinates of 2 points if selected under SEtuP When this method is selected the ...

Страница 29: ...ents the two points do not need to be known This method is used with DC process and load cell meters when known inputs are available It is also available for AC meters It is not available with thermocouple or RTD meters Option board dependent menu items ALSEt ALS34 dEU1H dEU2H dEU1b dEU2b dEU3H DEU4H DEU3b DEU4b Menu items related to alarm setup These will only appear if a relay board is detected ...

Страница 30: ...Please see further manual sections for relay output analog output communications and transducer excitation output BOARD SETUP VIA JUMPERS 1 Jumpers are installed on pins bridging letters 2 Use 2 5 mm 0 1 jumpers 3 Store spare jumpers on an unused jumper post THERMOCOUPLE READING ERRORS The following types of thermocouple errors need to be combined 1 Conformity error The difference between the mete...

Страница 31: ... ideal thermocouple wire The Special Limit of Error applies to more expensive Special Limits of Error SLE thermocouple wire Thermocouple Type Temperature Range C Temperature Range F Standard Limit of Error Special Limit of Error J 0 to 750 C 32 to1382 F 2 2 C or 0 75 1 1 C or 0 4 K 0 to 1250 C 200 to 0 C 32 to 2282 F 328 to 32 F 2 2 C or 0 75 2 2 C or 2 0 1 1 C or 0 4 T 0 to 350 C 200 to 0 C 32 to...

Страница 32: ... Scaling method 0 Offset only for thermocouple input 00_00 Rear panel control inputs 1 2 True logic 1 0V or tied to digital ground False logic 0 5V or open 0 1 Reset 2 Meter Hold 1 1 Function Reset 2 Peak or Valley 2 1 Hold 2 Peak or Valley Display 3 1 Hold 2 Tare 4 1 Peak or Valley Display 2 Tare 5 1 Tare 2 Reset 6 1 0 2 0 decimal point 1 XXXXX 1 1 2 0 decimal point 1 XXXX X 1 0 2 1 decimal point...

Страница 33: ...tpoint analog output data output 0 Autofilter Time constant set by meter 1 Batch average of 16 readings 2 Moving average 0 08 sec time constant 3 Moving average 0 15 sec time constant 4 Moving average 0 3 sec time constant 5 Moving average 0 6 sec time constant 6 Moving average 1 2 sec time constant 7 Moving average 2 4 sec time constant 8 Moving average 4 8 sec time constant 9 Moving average 9 6 ...

Страница 34: ... mm 0 1 jumpers 3 Store unused jumpers on one pin so that one side is not connected SCALE OFFSET SETUP Scale is normally set to 1 0000 Scale can be used as an RTD resistance multiplier when the actual resistance is other than nominal at 0 C For example if the resistance of a Pt100 RTD is measured as 99 04 ohms at 0 C you can apply a scale factor of 100 99 04 1 0097 Offset allow the reading in degr...

Страница 35: ...atically sub tracts wire resistance from the resistance measurement The short should be as close as possible to the load Ambient temperature changes will still cause some error in the readings the higher the lead resistance the greater the error OK to use 2 wire hookup without the special setup software steps below if wire resistance is negligible compared to the resistance to be measured To elimi...

Страница 36: ...ction with scale factor of 1 0 0 1 RTD or 4 1 2 digits for ohms 1 5 digit remote display 99 999 2 0 01 RTD 4 1 2 digit ohms count by 10 3 1 RTD or 3 1 2 digits for ohms 00 _00 Power line frequency 0 Noise minimized for 60 Hz 1 Noise minimized for 50 Hz 00_ 00 Scaling method 0 Scale and offset method RTD ohms 1 Coordinates of 2 points ohms 2 Reading coordinates of 2 points ohms 00_00 Rear panel con...

Страница 37: ...PEAK button and rear connector for Peak or Valley Display 0 Peak Display Also selects Peak in Peak or Valley at connector above 1 Valley Display Also selects Valley in Peak or Valley at connector above 2 Peak 1st push Valley 2nd push 3 Front panel Tare 00000 Auto tare selection 0 No auto tare 1 Auto tare 00000 RTD or Ohms wiring RTD Ohms 00 3 or 4 wire 3 or 4 wire 01 Not allowed Custom curve 10 2 ...

Страница 38: ...Then press key to move flashing decimal point OFFst Offset value 0 0000 0 0000 0 0000 0 0000 0 0000 Select digit to flash Select 9 thru 9 for flashing first digit 0 thru 9 for other flashing digits Use offset for display in Rankine or Kelvin Decimal point location is selected by dEC Pt Option board dependent menu items ALSEt ALS34 dEU1H dEU2H dEU1b dEU2b dEU3H DEU4H DEU3b DEU4b Menu items related ...

Страница 39: ...d After pressing you have 30 seconds or the meter reverts to the normal display To view setpoints menu item Loc3 digit 2 must have been set to 0 To change setpoints menu item Loc2 digit 2 must have been set to 0 Press Alarms Key Press Digit Select Key Press Value Select Key 300 24 Press Alarms to display Alarm 1 setpoint _200 00 Current setpoint 1 value blinks and Alarm 1 LED indicator lights Pres...

Страница 40: ...d AL2 below 6 AL1 at or above AL2 disabled 7 AL1 below AL2 disabled 8 AL1 disabled AL2 disabled 00000 Hysteresis mode or band deviation mode See Glossary 0 AL1 band deviation AL2 band deviation 1 AL1 split hysteresis AL2 band deviation 2 AL1 band deviation AL2 split hysteresis 3 AL1 split hysteresis AL2 split hysteresis 4 No deviation or hysteresis in menu 5 AL1 span hysteresis AL2 band deviation ...

Страница 41: ...0 0 0000 0 0000 0 0000 0 0000 Select digit to flash Select 9 thru 9 for flashing first digit 0 thru 9 for other flashing digits Alarms will activate above the setpoint by the value entered and deactivate below the setpoint by the value entered DEU2H Alarm 2 hysteresis DEU1b Alarm 1 band deviation 0 0000 0 0000 0 0000 0 0000 0 0000 Select digit to flash Select 9 thru 9 for flashing first digit 0 th...

Страница 42: ...ow displayed reading An Lo The high analog output 20 mA 0V or 10V may be set to correspond to any high displayed reading An Hi The meter will then apply a straight line fit between these two end points to provide an analog output scaled to the meter reading KEYSTROKES FOR SETUP If the MENU key does not work see Section 9 Enabling Locking Out Menu Items Press Menu Select Key Press Digit Select Key ...

Страница 43: ...able with Type A and Type B connectors Upon first connection your computer may display Found new Hardware and automatically download and install the required USB driver from the Internet If installation is not automatic download the driver file with a name like CDM v2 10 00 WHQL Certified zip from http www ftdichip com Drivers VCP htm Unzip it into its own directory and point to that directory as ...

Страница 44: ... last meter in long cable run RS485 Modbus Board Half Duplex Operation b e Bias jumpers installed on 1 board c f Installed for half duplex operation a Installed on last meter in line with long cable runs Note Board is shipped with no jumpers installed Ethernet to RS485 Converter Board USB to RS485 Converter Board Full Duplex Operation No jumpers for short cable runs Add b for long cable runs Half ...

Страница 45: ... 45 SERIAL CONNECTION EXAMPLES ...

Страница 46: ...top bit __000 Output filtering 0 Send unfiltered signal 1 Send filtered signal __000U Baud rate 0 300 baud 1 600 baud 2 1200 baud 3 2400 baud 4 4800 baud 5 9600 baud 6 19200 baud __000U Output update rate 60 Hz 50 Hz 0 Line frequency Line frequency 1 0 28 sec 0 34 sec 2 0 57 sec 0 68 sec 3 1 1 sec 1 4 sec 4 2 3 sec 2 7 sec 5 4 5 sec 5 4 sec 6 9 1 sec 10 9 sec 7 18 1 sec 21 8 sec 8 36 6 sec 43 5 se...

Страница 47: ...stop char 0 Standard continuous mode 1 Special start stop characters 00000U RTS mode for RS232 0 Normal RS232 operation 1 Single RS232 transmission mode with e jumper on RS232 board 00000U Termination characters 0 Only at end of all items 1 At end of each item 00000U Data sent in continuous mode 0 Reading 1 Peak 2 Valley 3 Reading peak 4 Reading valley 5 Reading peak valley SEr 4 Serial Setup 4 __...

Страница 48: ...alled an external reference voltage up to 20 Vdc can be applied to the meter for ratiometric operation Excitation output Jumper locations 5 Vdc 5 100 mA max 10 Vdc 5 120 mA max 24 Vdc 5 50 mA max None b d e b d f c No jumpers Jumpers in lower left Jumpers a h g in the lower left of the power supply board provide special features when installed Jumper a Front panel menus are locked out when install...

Страница 49: ...nzip it into a directory such as c temp Within that directory double click on setup exe to install the software on your PC PREREQUISITES FOR CONNECTED USE 1 PC with an available communication port 2 Meter to be set up 3 Communication board in meter This board can be removed following meter setup 4 Communication cable from meter to PC 5 Instrument Setup software ESTABLISHING COMMUNICATIONS Connect ...

Страница 50: ...lay Scaling Filter Relay Alarms Communications Analog Out and Lockouts If the required hardware such as the analog output board is not sensed the corresponding tab will be grayed out ADDITIONAL FEATURES The Commands pull down menu allows you to execute certain meter functions by using your computer mouse You can reset individual meter functions display current or peak readings and enter numbers to...

Страница 51: ...ing Press Repeat to take more readings When you have decided on which reading to accept press on the number 1 through 10 of that reading Additional calibra tion software is available online METER SETUP WITH AN UNCONNECTED PC Instrument Setup software is also of benefit when the PC is not connected to a meter Upon launching the software click on None for Communications then on DPM and Series 2 Clic...

Страница 52: ...RTED Download curve exe into the same directory that will contain your data files such as c curves Set the meter baud rate to 9600 To do so press the key to get to SEr 1 then set the entry to __050 Set the meter address to 1 To do so press the key to get to SEr 2 then set the entry to _0011 To execute the program from Windows simply double click on curve exe which is an executable file Follow the ...

Страница 53: ... X is a blank Specify the same position that you specified in the dEc Pt decimal point menu selection Follow the steps on the screens to finish generating the custom curve When prompted to download the file to the meter select Y When prompted to set the meter to custom curve mode also select Y KEYPAD CONTROL You can take a meter in and out of custom curve linearization using the meter keypad From ...

Страница 54: ...on 20 An RS232 RS485 USB or Ethernet interface board must be installed in the meter for communication to the PC This board may be removed following calibration A certified calibrated signal source is also required The Calibration screen of Instrument Setup Software is accessed by clicking on Calibration at the top of the DPM Main Menu screen The PC first recognizes the type of board then prompts y...

Страница 55: ...lue Tare input Logic 0 offsets input value to zero Tare Reset Logic 0 resets Tare value to zero Reset input Logic 0 resets all meter functions Function Reset input Logic 0 resets peak values and alarms Decimal Point input Overrides internal DP selections and controls DP position Display Blank input Logic 0 shuts off the display Power Requirements Input Voltage standard power 85 264 Vac or 90 300 V...

Страница 56: ...mA 0 1 µA 1 µA 10 µA 100 Ω 10 Ω 1 Ω 0 1 of FS 2 cts 5 000 A 1 mA 0 01 Ω 20 mA 600V ranges not ETL certified Thermocouple 0 1 1 resolution Type Range Error J 210 to 760 C 347to 1400 F 01 FS 0 09 C 01 FS 0 16 F K 244 to 1372 C 408to 2501 F 01 FS 0 10 C 01 FS 0 17 F T 0 to 400 C 257 to 0 C 01 FS 0 03 C 01 FS 0 20 C 32 to 752 F 430 to 32 F 01 FS 0 05 F 01 FS 0 36 F E 240 to 1000 C 400 to 1830 F 01 FS ...

Страница 57: ...t do not change setpoints 3 Neither display nor change setpoints Alarm Status Indication 2 or 4 red LED lamps Status Indication Setup selectable Lit when output is ON or OFF or disabled Form C SPDT Relay Output AC Rating 8A 240 Vac DC Rating 8A 24 Vdc Isolation rating between signal common and contacts 250 Vac Insulation dielectric strength between signal common and contacts 2 3 kV ac for 1 min Fo...

Страница 58: ...ing Half or full duplex Baud Rates 300 600 1200 2400 4800 9600 19200 Serial Protocols Custom ASCII Modbus RTU Modbus ASCII selectable Signal Levels Meet RS232 RS485 USB Ethernet standards Isolation rating between signal common and serial I O 250V ac Insulation dielectric strength between signal common serial I O 2 3 kV ac for 1 min Option Board Connectors RS232 Single RJ11 jack RS485 Two RJ11 jack...

Страница 59: ...reading rises above a specified limit and changes back automatically when the reading falls below a limit Autofilter A selectable digital filter mode which automatic ally selects an appropriate moving average filter time constant from 0 08 sec to 9 6 sec for the encountered noise condition Auto tare A selectable meter operating mode where the first reading following power on or meter reset is used...

Страница 60: ...hich connects a control input 1 or 2 at the rear of the meter to digital ground The functions of control inputs are programmed under Setup Peak and Valley can also be reset by simultaneously pressing the RESET and PEAK keys Latched alarms can also be reset by simultaneously pressing the RESET and ALARM keys Ground Loop A closed conductive path in external ground wiring that allows stray currents t...

Страница 61: ...displays a weighting moving average of readings Readings are taken at 60 sec with 60 Hz power and 50 sec with 50 Hz power Display update rates remain 3 5 sec with 60 Hz power and 3 0 sec with 50 Hz power There are eight moving average modes Old average x 1 2 new reading x 1 2 equivalent to 0 08 sec RC time constant Old average x 3 4 new reading x 1 4 equivalent to 0 15 sec RC time constant Old ave...

Страница 62: ... Half Duplex Serial communications implemented with two wires allowing data transmission in both directions but not simultaneously RS485 Full Duplex Serial communications implemented with four wires allowing data transmission in two directions simultaneously Run Mode The normal operating mode of the meter where readings are taken as opposed to the menu mode Scale A constant multiplier used to go f...

Страница 63: ...nds are specified by two symmetrical limits around the setpoint Span The number of counts corresponding to a given signal range Tare A rear panel input which causes the display to be set to zero when the input is momentarily tied to logic ground by a switch or is held at 0V logic level true When the input is allowed to float or is held at 5V logic level false the meter displays readings relative t...

Страница 64: ... Mishandling or abuse The warranty set forth above is exclusive and no other warranty whether written or oral is expressed or implied Laurel specifically disclaims implied warranties of merchantability and fitness for a particular purpose Any electronic product may fail or malfunction over time To minimize risks associated with reliance on Laurel products users are expected to provide adequate sys...

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