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RPT 301 User Manual

K177 Issue No. 3

Command Summary Table

* Short form of the 'R<CR>' command

Command

Function

Measurement

R

Return stored reading

<CR>

*

Return stored reading

G

Get New Reading

A

Auto send reading

X

Auto send from power-up

Set-up

U

Set units

F

Set filter

B

Set reading resolution

O

Set communication parameters

S

Status

I

Identity

User calibration

C

User calibration (linearity)

P

Change protection PIN

CR   CRLF

Command Terminators

Summary of Contents for Sensing RPT 301

Page 1: ...RPT 301 Digital Output Pressure Transducer User Manual K177 GE Sensing ...

Page 2: ... General Electric Company All rights reserved ...

Page 3: ...77 Druck Limited 1998 This document is the property of Druck Limited and may not either in part or whole be copied or otherwise reproduced communicated in any way to third parties nor stored in any Data Processing System without the express written authority of Druck Limited ...

Page 4: ...K177 Issue No 3 ...

Page 5: ... and good engineering practice for all procedures in this manual Pressure Do not apply pressure greater the maximum safe working pressure to the instrument Electrical Safety This instrument is designed to be safe when using options and accessories supplied by the manufacturer Toxic Materials There are no known toxic materials used in this instrument Maintenance The instrument must be maintained us...

Page 6: ...nearity hysteresis and repeatability PCB printed circuit board psi pound per square inch RPT resonant pressure transducer V Volt VA Volt amp Hazard a warning highlighting a danger that would result in injury Also a marking on the instrument referring the user to this publication This product meets the essential protection requirements of the relevant EEC directives Further details of applied stand...

Page 7: ...Pressure Connection 4 2 3 Electrical Connection 6 3 Operation 11 3 1 System Operation 11 3 2 Command Summary 11 3 3 General Command Format 13 3 4 General Reply Format 15 3 5 Error Message 15 3 6 Detailed Command Definitions 17 4 Calibration 23 5 Maintenance 26 5 1 General 26 5 2 LED Indicator 26 5 3 Diagnostic Mode 26 5 4 Cleaning 27 5 5 Approved Service Agents 28 ...

Page 8: ...K177 Issue No 3 iv RPT 301 User Manual ...

Page 9: ...or RS485 standard communications interface The power supply for the instrument is a wide tolerance DC voltage with a low power consumption A remote start up facility enables the instrument to be remotely switched on and off to save power 1 2 Specification Accuracy Non linearity hysteresis and repeatability Standard 0 02 FS Option A 0 01 FS Temperature affects 0 02 FS over operating temperature ran...

Page 10: ...p response Reading Resolution Programmable number of decimal places Data Communications Serial RS232 or RS485 selectable Software or hardware handshaking on RS232 software handshaking only on RS485 Power Control Remote Start Up A floating volt free two wire control input is provided to enable the instrument to be remotely switched on or off Pressure connection G1 8 female overpressure 1 25 x calib...

Page 11: ... Issue No 3 RPT 301 User Manual 3 Accessories Thefollowingitemsaredeliveredwiththeinstrumentaftermanufacture User manual K177 this publication Calibration certificate Mating electrical connector if ordered ...

Page 12: ...ent is very sensitive to air movement small local pressure changes when the pressure port is directly sensing the atmosphere the fitting of a filter or restrictor is recommended 2 Installation Installation must be carried out by a qualified technician 2 1 Mounting the Instrument Figure 2 1 The instrument can be mounted on a vertical surface using two screws or bolts to a maximum diameter of 4 mm ...

Page 13: ...K177 Issue No 3 RPT 301 User Manual 5 Figure 2 2 Instrument Dimensions ...

Page 14: ... the Start up input and the RTS input on pin D so that the control computer can turn on the instrument 2 3 Electrical Connection The electrical connector is a 10 way connector MIL C26482 for serial parallel and power connections Instrument Connector Plug Amphenol 62GB 12E12 10P Cable Connector Socket Amphenol 62GB 16F12 10S Communication connections When configured for RS485 A Power Supply ve B Po...

Page 15: ...urrent consumed by the instrument is approximately 1 mA at 3 V 2 mA at 5 V rising to 16 mA at 32 V If necessary when using a supply greater than 5 V a series resistor can be used to reduce the current drain to 1 mA Connections for remote on off control using RS232 output current limiting resistor for high supply voltages see text Connections for remote on off control Connections for continuous ope...

Page 16: ... interface standard Figure 2 3 The communication interface standard is set at manufacture to RS232 but can be changed as follows Remove the lid of the instrument to gain access to the PCB CAUTION THE PCB CONTAINS SENSITIVE ELECTRONIC COMPONENTS Carefully connect the interface connector lead and the link LK2 in the following positions RS232 interface lead to PL1 LK2 to position A Refit and secure t...

Page 17: ...K177 Issue No 3 RPT 301 User Manual 9 Figure 2 3 Changing the communication interface PL3 LK2 B B LK1 A B PL1 ...

Page 18: ...omputer enclosure RPT 301 Screening to ensure EMC performance Screening Make sure that the chassis connection between the control computer and the instrument is continuous Use screened cable and bond the cable screening to the connector shell of the instrument and to the computer enclosure ...

Page 19: ...onversion into its pressure equivalent Measurement cycles are continuous unless specifically interrupted see the G command Each cycle delivers a new pressure value to the programmable filter The output of this filter is stored in a buffer and may be requested by the control computer or sent automatically at a programmable interval to the control computer 3 2 Command Summary The instrument has a ra...

Page 20: ...t R Return stored reading CR Return stored reading G Get New Reading A Auto send reading X Auto send from power up Set up U Set units F Set filter B Set reading resolution O Set communication parameters S Status I Identity User calibration C User calibration linearity P Change protection PIN CR CRLF Command Terminators ...

Page 21: ... P2 Pn CT Where Command is a single ASCII character P1 to Pn are numbers in the form mmm ddd or m ddddE xx e g 123 456 or 1 23456E02 Example Single Command CT is the command terminator CR or CRLF A 3 CR selects auto send mode with 3 second period a 3 CRLF has the same effect Command Strings Commands can be strung together with a separating semicolon The whole command string is only interpreted and...

Page 22: ...nt units to mbar returns two consecutive readings changes units to psi returns three consecutive readings and then selects auto send mode with a period of 100 seconds between readings Command String Limitations Auto send mode and diagnostics mode are cancelled when a further command is received this should be used at the end of a command string Note The C L and T commands are interactive and are n...

Page 23: ...ired output when the carriage return or enter key is pressed For Custom applications CR decimal 13 or CRLF decimal 13 followed by decimal 10 must be added to the end of each complete command string CT is expected with all commands except for some interactive commands where further explanation is necessary e g Section 4 User Calibration 3 5 Error Message Error messages are generated from two source...

Page 24: ...Bad command 02 Bad password 04 Bad data detected by checksum 08 Data out of range 16 Hardware fault 32 Pressure outside range 64 System not ready Error messages are sent when an error is detected Example When first detected the hardware fault error is sent once even though the fault persists sending the S status command provides further details of the fault ...

Page 25: ...to return the reading i e G R CR The instrument proceeds to the next command after the end of the measurement cycle see specification for duration or in the event of a reading failure fault condition after a time out of approximately2seconds Thecommandsynchronisesthemeasurement cycle with an external event Note Use of the G command overrides any filter that has been selected The reading obtained i...

Page 26: ...re transducer continuously sends readings and does so even after power failure this includes using the shutdown facility then the X command can be used to select this facility This command allows a transmission period to be stored in nonvolatile memory which will be automatically loaded and actioned as if the A command had been sent at switch on Command X nnnnnn Where nnnnnn is a number between 0 ...

Page 27: ...e Command U nn Where nn can be up to two digit number taking one of the following values 0 mbar 13 mH2 0 1 Pa 14 torr 2 kPa 15 atm 3 MPa 16 psi 4 hPa 17 lb ft2 5 bar 18 inHg 6 kg cm2 19 inH2 O04 7 kg m2 20 ftH2 O04 8 mmHg 21 mbar 9 cmHg 22 inH2 O20 10 mHg 23 ftH2 O20 11 mmH2 O 24 mbar 12 cmH2 O Note mbar can be selected using code 0 21 or 24 Reply None ...

Page 28: ...trument s resolution see specification The reading resolution is automatically selected according to the instrument full scale and the units that have been selected using the units set up command An algorithm is used that gives a resolution which does not interfere with the accuracy of measurement and is as noise free as possible before filtering The set resolution command allows the number of dec...

Page 29: ...nge the communications settings this may be considered useful in some applications Default on shipment is set to the command O 000 00 0 0 0 0 0 which means 9600 baud 8 data bits 2 stop bits no parity no handshake Command O PIN address baud data bits stop bits parity handshake Where PIN is a three character password 000 999 address always 00 baud rate value 0 7 0 9600 1 4800 2 2400 3 1200 4 600 5 3...

Page 30: ...unit identity Command I Reply type range S N cal date Result No change in status or operation Where Type Equipment model Druck RPT 301 Range Pressure range lower and upper and pressure type S N Transducer serial number Cal date Date of last calibration Command I S PIN Name Value CR format i When Name S Value nnnn yy mm Reply S N nnn yy mm Result sets displayed serial number ii When Name H Value nn...

Page 31: ...rried out at chosen intervals The readingsoftheinstrumentshouldbecomparedwithapressurestandard and after any adjustments for accuracy traced to National Standards the differences recorded The adjusted differences can then be compared with the required accuracy for the instrument If necessary a calibration adjustment can be carried out The recommended procedure is to check at increasing and then de...

Page 32: ...rument to operate in the pressure measurement units required for calibration i e U 0 CR selects mbar Always use the same units when entering applied pressures Command C PIN Reply APPLY PRESSURE nn apply pressure when steady send CT Reply ENTER APPLIED PRESSURE nn type pressure value decimal number followed by CT Reply MORE Y N type Y CT to calibrate more points or type N CT to complete calibration...

Page 33: ...h the PIN 000 If the PIN is lost the default 000 may be restored by fitting the default link and switching off and then on Note Restoring the defaults restores ALL of the factory settings including the communication parameters Command P PIN New PIN Where PIN is the existing 3 digit code 000 to 999 and New PIN is the replacement PIN Reply None Result PIN is replaced by New PIN ...

Page 34: ...d diode voltage are within normal limits 5 3 Diagnostic Mode D Diagnostic Mode This command places the instrument into the diagnostic mode Command D mode Where mode is a single digit 1 Dump all 512 stored values 2 Dump transducer coefficients checks LOAD L command 3 Dump calibration factors i e gain offset etc 4 Continuous output of sensor diode voltage temperature mV 5 Continuous output of sensor...

Page 35: ...RT Mode 3 Frequency constant pressure gain pressure offset diode volts offset Mode 4 DIODE value For every reading where value is the diode voltage in mV Mode 5 FREQUENCY value For every reading Where value is the sensor frequency measured in Hz Modes 4 and 5 are cancelled by any other command 5 4 Cleaning Clean the external case of the instrument with a damp lint free cloth and mild detergent Mak...

Page 36: ...28 RPT 301 User Manual K177 Issue No 3 5 5 Approved Service Agents Find approved agents for the servicing of Druck Instruments at www gesensing com ...

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