Page 1 © 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, or stored in any Data Processing System, without the express written authority of Druck Limited.
Page 2 DPI 520 User Manual SAFETY The Manufacturer has designed this product to be entirely safe when operated correctly. Please pay close attention to the Safety Instructions outlined on this page and ● ● ● ● ● elsewhere in this manual. They have been designed to protect the user from personal injury and the equipment from damage.
Page 3 Safety Repair and Maintenance This publication contains information and warnings which must be followed for safe operation and to maintain the equipment in a safe condition. Use qualified* personnel and good engineering practice for all procedures in this publication. The operator must not use this equipment for any other purpose than that stated. Do not apply a pressure greater than the maximum pressure stated.
Page 4 DPI 520 User Manual ABBREVIATIONS Abbreviations are the same in the singular and plural. NOTE: alternating current atmosphere degrees Celsius °C degrees Fahrenheit °F common centimetre squared continued contd direct current digital multimeter device under test enter full-scale feet kilogram...
Page 5: Table Of Contents
Contents Section Page INTRODUCTION ..................... 1-1 Instrument Specification .................. 1-2 Applications ..................... 1-6 1.2.1 Control by Remote Computer via IEEE 488 ........1-6 1.2.2 Control by Remote Computer via RS232 ..........1-7 1.2.3 Control by Remote User Interface ............1-7 FUNCTIONAL DESCRIPTION ................
Page 6 DPI 520 User Manual Section Page OPERATION ....................4-1 Local Mode ...................... 4-1 Remote Mode ....................4-1 Control Codes ....................4-1 4.3.1 Control Code Format ................4-2 4.3.2 Implementation of checksums ............. 4-3 Command Description ..................4-6 4.4.1 Set to Local Mode - 'M' ................ 4-6 4.4.2...
Page 7 Contents Section Page CALIBRATION ....................5-1 Calibration Check .................... 5-1 Calibration Adjustment ..................5-2 5.2.1 General Procedures ................5-3 Using the Calibration Menu ................5-4 5.3.1 Test ...................... 5-4 5.3.2 Calibration (Cal) ................... 5-5 Checking Linearity Calibration ................ 5-6 Full Scale and Zero Adjustment ..............5-7 Non-Linearity Adjustment ................
Page 8 viii K163 Issue No. 3...
Page 9: Introduction
A remote User Interface (RUI 100 and RUI 101) is available giving manual control and display on one, two or three DPI 520 in a 'stacked' system. In this way, control is provided to a high accuracy over a wide pressure range. See the RUI 100/101 Product Note for details.
Page 10: Instrument Specification
DPI 520 User Manual Instrument Specification Pressure Ranges Output Pressure ..................... 0 to 70 bar absolute ....................-1 to 70 bar gauge maximum 2 bar line pressure on gauge units Maximum Safe Working Pressure ..................125 % full scale pressure Source Pressure Range Positive pressure .............
Page 11 Host (RS232) ......9-pin, D-type connector, wired for point to point RS232 on pins 2 and 3 User Interface (RS232) ............9-pin, D-type connector for connection to Druck rack mounting Remote User Interface. Daisy chained to RS232 port. Supplies 24V D.C. supply for Remote User Interface.
Page 12 Input/Output Connections (Front Panel) Electrical Connections User Interface (RS232) ............6-way Lemo socket for connection to Druck Desktop Remote User Interface, Type RUI 100. Daisy chained to RS232 port with automatic bypass when not in use. Supplies 24V d.c. for the user interface.
Page 13 1: Introduction Options Option A1 Combined non-linearity, hysteresis and repeatability ............±0.05% of reading (20% to 100% full scale) ............. ±0.01% of full scale (0 to 20% full scale) Temperature Coefficient .............±0.002% rdg/°C (averaged over 10° to 30°C) Option A2 Combined non-linearity, hysteresis and repeatability ............
Page 14: Applications
DPI 520 User Manual APPLICATIONS 1.2.1 Control by Remote Computer via IEEE 488 Using the IEEE 488 general purpose control bus, a remote computer can control either a single stand alone unit or a number of units up to a maximum of 15. When controlling a number of instruments each instrument on the bus is allocated a unique address (set with the instrument via a SETUP facility).
Page 15: Control By Remote Computer Via Rs232
Section 3. 1.2.3 Control via Remote User Interface Two types of Druck Remote User Interface can be used to control up to three DPI 520 instruments. These remote interface units, types RUI 100 (desk top) and RUI 101 (rack mounted), plug into special user interface sockets, located on the front and rear panels respectively.
Page 16 DPI 520 User Manual Figure 1.2 - Control from a Remote User Interface K163 Issue No. 3...
Page 17: Functional Description
FUNCTIONAL DESCRIPTION General The DPI 520 instrument is a single channel pressure controller, designed to be programmed either from an external computer system or remote user interface. No user controls are provided on the instrument, it’s local keyboard being used only for set-up, calibration and maintenance operations.
Page 18 DPI 520 User Manual The microprocessor system also controls the flow of data to the instrument’s display. The display is a two line (20 characters/line) liquid crystal dot matrix type. Operationally, it is used to display pressures, functions and messages.
Page 19: Analogue Circuit Operation
: Functional Description 2.2.2 Analogue Circuit Operation (Fig 2.2) Output pressure control is effected by means two solenoid operated valves. One of these valves, the Apply valve, controls the application of a source pressure to the output manifold. The other valve, the Release valve, releases the output pressure.
Page 20 DPI 520 User Manual Figure 2.2 - Analogue Electronics, Functional Diagram K163 Issue No. 3...
Page 21: Installation
: Installation INSTALLATION Safety Instruction IT IS ESSENTIAL THAT THE INSTALLATION OF ELECTRICAL AND PNEUMATIC SUPPLIES BE UNDERTAKEN BY A COMPETENT PERSON. INSTALLATION REQUIREMENTS 1. THE INSTRUMENT IS DESIGNED TO BE RACK MOUNTED IN A STANDARD 19" RACK OR SUB- RACK AND OCCUPIES 2U OF SPACE.
Page 22 (G1/8) reference connector (M5) analogue output connector user interface connector (rear panel) 10 RS232 interface connector IEEE 488 interface connector user interface connector (front panel) Figure 3.1 - DPI 520 Rear Panel Connections K163 Issue No. 3...
Page 23: Electrical Connections
: Installation Electrical Connections 3.2.1 Electrical Safety Instructions IT IS IMPORTANT TO USE THE CORRECT SUP- PLY SETTINGS. OPERATING VOLTAGE RANGES ARE MARKED ON THE REAR PANEL OF THE INSTRUMENT AND ARE GIVEN IN SECTION 1, SPECIFICATION. It is essential that the Earth lead (coloured green/yellow) is connected to the a.c. Supply Protective Safety Earth.
Page 24 DPI 520 User Manual COOLING FLOW Fig 3.2 A.C Power Supply Socket K163 Issue No. 3...
Page 25: Communications Interface Connections
IEEE 488 Interface (Fig. 3.3) The IEEE 488 General Purpose Interface Bus (GPIB), is a parallel interface used to connect a host computer/controller to one or more DPI 520 instruments and possibly other instruments. A typical system is shown in Figure 3.3. To connect a number of instruments together, the IEEE 488 bus is connected, in parallel, to all devices on the bus.
Page 26 DPI 520 User Manual Fig 3.3 - IEEE 488 Connection K163 Issue No. 3...
Page 27: Single Unit Installation
: Installation Separate ground connections are provided for each of the Transfer Control Lines and the IFC and SRQ lines, all of which are run as twisted pairs in the IEEE 488 cable. CAUTION: For EMC compliance, all leads must be less than 3M in length.
Page 28: Multiple Unit Installation
Plug a pair of IEEE 488 stacking connectors as shown below, into the ❍ ❍ ❍ ❍ ❍ IEEE 488 socket located on the rear panel of the instrument. DPI 520 IEEE 488 socket IEEE 488 (to host) IEEE 488 to other instruments Connect the other end of one of the connectors into the IEEE 488 socket on ❍...
Page 29: Rs232 Interface
One of the rear panel connectors and the front panel connector are dedicated to the connection of a Druck Remote User Interface (RUI 101- rear, RUI 100 - front). The remaining 9-pin D-type connector is for connection of a host computer and the daisy-chain system.
Page 30 DPI 520 User Manual 3-10 / I ( ¬ ® « / I ( ¬ ® e l l ® y l l ¬ e l l ® y l l « l l e l l e * Note 1 - Pin 9 used for RxD in daisy chain network applications only Table 3.1 - RS232 Connections...
Page 31: Connecting To A Computer
: Installation 3-11 3.5.2 Connecting to a Computer The connection method for RS232 operation between a host computer and the instrument depends on the handshaking method to be implemented and the type of connector used on the computer’s output port. Table 3.1 shows the connections and the following schematic diagrams detail the correct wiring information.
Page 32 Connect pins 6, 4 and 9 together and link pins 7 and 8 at the host connector ❍ ❍ ❍ ❍ ❍ end of the cable. Connect the host comms port to the DPI 520 instrument’s 9-way, ❍ ❍ ❍ ❍ ❍ D-type, RS232 port connector as shown in Figure 3.4.
Page 33 Connect pins 6, 8 and 20 together and link pins 4 and 5 at the host connector ❍ ❍ ❍ ❍ ❍ end of the cable. Connect the host computer communications port to the DPI 520 instrument’s ❍ ❍ ❍ ❍ ❍ 9-way, D-type, RS232 port connector as shown in Figure 3.4.
Page 34 For hardware handshaking between the instrument and a host computer that uses a 9-pin, D-type connector, proceed as follows. Connect the host communications port to the DPI 520 instrument’s 9-way, D- ❍ ❍ ❍ ❍ ❍ type, RS232 connector as shown in Figure 3.6.
Page 35 For hardware handshaking between the instrument and a host computer that uses a 25-pin, D-type port connection, proceed as follows. Connect the host communications port to the DPI 520 instrument’s 9-way, D- ❍ ❍ ❍ ❍ ❍ type, RS232 port connector as shown in Figure 3.7.
Page 36 Connect pins 6, 4 and 9 together and link pins 7 and 8 at the host connector ❍ ❍ ❍ ❍ ❍ end of the cable. Connect the host comms port to the DPI 520 instrument’s 9-way, ❍ ❍ ❍ ❍ ❍ D-type, RS232 port connector as shown in Figure 3.4.
Page 37 Connect pins 6, 8 and 20 together and link pins 4 and 5 at the host connector ❍ ❍ ❍ ❍ ❍ end of the cable. Connect the host computer communications port to the DPI 520 instrument’s ❍ ❍ ❍ ❍ ❍ 9-way, D-type, RS232 port connector as shown in Figure 3.4.
Page 38: Connection Of Remote User Interface
DPI 520 User Manual 3-18 Connection of Remote User Interface Refer to publication K181 for connection details. Analogue Output Socket Connection to the Analogue Output socket is made via a coaxial BNC connectors. To connect to the sockets, connect a lead fitted with a BNC plug to the socket and turn clockwise to lock the bayonet into place.
Page 39: Pressure Connections
: Installation 3-19 Pressure Connections 3.8.1 Pressure Safety Instructions ALWAYS CHECK FOR TRAPPED PRESSURE BEFORE CONNECTION OR DISCONNECTION OF PRESSURE COUPLINGS. ENSURE THAT CORRECTLY RATED PIPES AND FITTINGS ARE USED. OBSERVE MAXIMUM WORKING PRESSURE OF THE INSTRUMENT. 3.8.2 Connection (Fig. 3.9 and 3.10) To connect up to a pneumatic port, proceed as follows.
Page 40 DPI 520 User Manual 3-20 Ensure that the source pressure supply is isolated from the supply line. It is ❍ ❍ ❍ ❍ ❍ recommended that a 40 micron filter, regulator and an isolation valve be fitted between the pressure source and the instrument as follows (e.g.).
Page 41 : Installation 3-21 SUPPLY OUTPUT 1 SOURCE 1 DPI 520 REGULATOR SOURCE 2 OUTPUT 2 DPI 520 REGULATOR SOURCE 3 OUTPUT 3 DPI 520 DPI 520 Fig 3.10 - Source/Output Connection Schematic Output Pressure Port (Fig 3.10) Depending on the application, the Output ports of instruments with differing full scale outputs can be either be connected separately or connected together (in parallel).
Page 42 DPI 520 User Manual 3-22 Vent Port When the controller reduces the outlet pressure, gas flows from the user's system out of the Vent port of the controller. Initially, this port can be at the full working pressure of the system. Any equipment connected to the vent port (e.g.) pipes, fittings and vacuum pump, must be capable of handling the flow/pressure safely.
Page 43: Obtaining The Best Performance
: Installation 3-23 CAUTION: The REFERENCE port pressure must NOT exceed two times the full scale pressure range or 2 bar whichever is the smaller or the internal pipes and integral transducer could be damaged. Fit the reference line to the Reference port as shown in Fig. 3.9, fitting a ❍...
Page 44: Maximising Valve Life
DPI 520 User Manual 3-24 Controller RATE Setting - (see 3.9.2). Assuming the system volume is small ❍ ❍ ❍ ❍ ❍ such that flow rate through the control valves does not limit the fill time, then the controller RATE setting will determine the dynamic performance. The RATE...
Page 45: Control At Zero Gauge Pressure Without A Vacuum Pump
: Installation 3-25 Control at Zero Gauge Pressure without a Vacuum Pump As mentioned under 'Optimum Source and Vent Pressures' the instrument should have a negative pressure applied to the vent port for correct operation at zero gauge (atmospheric) pressure. However, zero will be achieved without this pressure providing the following are considered.
Page 46: Set-Up Mode
DPI 520 User Manual 3-26 Set-up Mode 3.9.1 General Set-up mode is used to set up the instrument's default control parameters to those required for the particular mode of operation. When the instrument is delivered, a number of default parameters are set, some of which may need to be changed for specific applications.
Page 47 : Installation 3-27 K163 Issue No. 3...
Page 48: Set-Up Menu
DPI 520 User Manual 3-28 3.9.2 Set-up MENU When the instrument is first delivered there is no PIN set. Any of the top level SETUP menu options can therefore be entered by operation of the SETUP key. A prompt showing the available menu options will be presented as follows (e.g.),...
Page 49: Keyboard (Unlocked)
: Installation 3-29 Keyboard (Unlocked) ● ● ● ● ● The keyboard parameter can have one of two states Locked or Unlocked. When selected, the current status is indicated and a prompt to change is given (e.g.), Keyboard: Unlocked Alter Next Quit Alter (F1), toggles the keyboard status between the available options...
Page 50: Set-Up Controller
DPI 520 User Manual 3-30 When Recall Defaults ? is initially selected, three options are made available as follows (e.g.), Recall Defaults ? Next Quit Select Yes (F1) to recall the previous set of stored default values. The parameters affected will be controller, scale, zero, set-point, value, ratio, preset and rate.
Page 51 : Installation 3-31 Stability ❍ ❍ ❍ ❍ ❍ The controller stability factor may require adjustment when the system volume is changed. The stability setting is typically, between 25 and 200. Following installation, to check the controller stability value for a given system volume, proceed as follows.
Page 52: Set Pin
DPI 520 User Manual 3-32 Autospeed (1) ❍ ❍ ❍ ❍ ❍ Auto-speed sets the maximum rate of change (exponential rise time), that can be made in a single step between any setpoint value and another. Auto- speed can be programmed between 0.1 (slow) and a maximum of 1 (fast).
Page 53: Self Test Electronic
: Installation 3-33 Show S/W Rev? ● ● ● ● ● This option causes the software part number and revision to be written to the display (e.g.), DK144 3.00 Next Quit Self Test: Electronic ● ● ● ● ● This set-up option forces the instrument to carry out a self test operation on it’s RAM, EPPROM and EEPROM, checking checksum values against known values.
Page 54: Self Test Pneumatic
DPI 520 User Manual 3-34 Self Test: Pneumatic ● ● ● ● ● This instrument leak test should only be carried out when the controller has been fully installed. The following system conditions should therefore exist. Source pressure connected and turned on.
Page 55 : Installation 3-35 Figure 3.12 Menu Set-up Options K163 Issue No. 3...
Page 56: Set-Up Communications
DPI 520 User Manual 3-36 3.9.3 Set-up COMMUNICATIONS Selection of the Comms option (F2) from the set-up menu, provides access to the parameter set-up facilities for both the RS232 and IEEE 488 communications interfaces. Figure 3.11 summarises the parameters accessed by each menu option.
Page 57 Mode (DPI 500/DPI 510 Emulation) ❍ ❍ ❍ ❍ ❍ The DPI 520 instrument can emulate either the Druck DPI 500 or DPI 510 instruments in terms of communication protocol. This parameter should remain set at DPI 520 unless there is a specific requirement to emulate either of these instruments.
Page 58 DPI 520 User Manual 3-38 QUIT COMMS (F2) < > IEEE ADDRESS (16) ENTER NEW PIN (F2) (YES) TERMINATOR KEYBOARD 9600 CR LF EOI CR EOI LF EOI KEYBOARD MODE DPI 520 9600 DPI 510 DPI 500 CHECKSUM KEYBOARD NONE...
Page 59 : Installation 3-39 RS232 Set-up ● ● ● ● ● To access the RS232 parameter set-up menus, select set-up, enter the PIN (if allocated) and select Comms (F2) from the main menu. Selection of Comms provides a choice of either RS232 or IEEE 488 as follows. Setup Comms RS232 IEEE...
Page 60 DPI 520 User Manual 3-40 Custom ❍ ❍ ❍ ❍ ❍ This selection allows the user to set-up all the RS 232 parameters as desired. The method of selection is shown on Figure 3.14. The parameters are:- Address - Used to set up a unique address in the range 0 to 99 for an individual controller.
Page 61 Always: Checksum added to output and is mandatory on input data. DPI 510 - This command enables a DPI 520 to emulate a Druck DPI 510 controller i.e. to recognise the DPI 510 command set. It takes one of two values YES or NO.
Page 62 DPI 520 User Manual 3-42 Figure 3.14 RS232 Set-up Menu (Sheet 1) K163 Issue No. 3...
Page 63 : Installation 3-43 Figure 3.14 RS232 Set-up Menu (Sheet 2) K163 Issue No. 3...
Page 64 DPI 520 User Manual 3-44 Figure 3.14 RS232 Set-up Menu (Sheet 3) K163 Issue No. 3...
Page 65: Set-Up More (Scale, Zero, More)
: Installation 3-45 3.9.4 Set-up More (Scale, Zero, More) The More option of the set-up menu, extends the set-up functions to the scale, zero, set-point and rate features of the instrument as shown in Figure 3.12. A brief summary of each of these functions is shown below. The set-up method for each parameter follows the summary.
Page 66 DPI 520 User Manual 3-46 Unit Symbol Unit Pascal kilo-Pascal mega-Pascal mbar millibar kg/cm kilogram per square centimetre kg/m kilogram per square metre mmHg millimetre of Mercury cmHg centimetre of Mercury metre of Mercury millimetre of water centimetre of water...
Page 67 3-47 Zero ● ● ● ● ● There are three zero modes for the DPI 520, Manual, Timed and Auto. Each mode can be enabled and disabled under the set-up More option. Manual Zero The manual zero facility enables the instrument to be instructed to perform a zero operation by the O command (O1).
Page 68 DPI 520 User Manual 3-48 Auto Zero When selected, the auto zero mode causes the instrument to perform an automatic zero every time an aim of zero pressure is made. Set-up method (Zero) Press set-up key and enter PIN if required to display ❍...
Page 69: More (Set-Point And Rate)
: Installation 3-49 Enter the required zero period on the numeric keypad and press the Enter (← ← ← ← ← ) key. A prompt for the entry of a wait period will now be given (e.g.), Enter new wait (secs): 30 Enter the required Wait time on the numeric keypad and press the Enter (←...
Page 70 DPI 520 User Manual 3-50 Ratio ❍ ❍ ❍ ❍ ❍ Selecting the Ratio mode from the set-point option provides a sub-menu of twelve ratios (figures represent a percentage of current set-point). The factory default values for these ratios provide 10% steps from zero to 110% of current scale reading.
Page 71 : Installation 3-51 Rate ● ● ● ● ● Rate provides three possibilities to be set-up for selection. Each of the three function keys, F1, F2 and F3 can be programmed with one of three options, Max, Auto or a Variable value rate. The control commands J0 through J2 will call the units programmed to these keys as follows.
Page 72 DPI 520 User Manual 3-52 Ratio ❍ ❍ ❍ ❍ ❍ After selection of Ratio option (F2) from the set-point menu, the current ■ value for Ratio % 0 will be displayed, together with the change menu. The default value for this parameter is zero (e.g.), Ratio %0 = 0.0000...
Page 73 : Installation 3-53 Set-up Method (Rate) Press set-up key and enter PIN if required to display set- SET UP ■ up menu. Menu ❍ Comms ❍ More ● Select More (F3) and select More (F1) from more menu. ■ Scale ❐...
Page 74 DPI 520 User Manual 3-54 K163 Issue No. 3...
Page 75: Operation
: Operating Instructions OPERATION This instrument is normally operated in remote mode using IEEE or RS232. Local mode is used for instrument set-up and calibration purposes only. No operational commands (e.g.) set-point or tare values can be entered via the keyboard. Control can only be effected in remote mode either via the IEEE 488 or the RS232 serial interface ports.
Page 76: Control Code Format
DPI 520 User Manual 4.3.1 Control Code Format All values are coded as the ASCII equivalent commands and may be sent individually or in strings. Symbols used to describe these ASCII codes are: contain a parameter which is further defined.
Page 77: Implementation Of Checksums
: Operating Instructions 4.3.2 Implementation of Checksums The RS232 and IEEE488 communication protocol on the instrument have a user selectable checksum option. This increases the validity of data transfer. The checksum protocol is bidirectional, the instrument can generate checksums for outgoing data and check checksums for incoming data.
Page 78 Checksum errors are generated by setting the 1st and 8th bit of the status byte (programming error and checksum bit). In DPI 520 mode all the status bits can be displayed since the NOTE: status is displayed as a 2 digit hexadecimal number. In DPI 500 and 510 mode only, the first six status bits are displayed (2 digit octal).
Page 79 : Operating Instructions Table 4.1 RS 232 and IEEE Command Summary K163 Issue No. 3...
Page 80: Command Description
DPI 520 User Manual Command Description The following sections describe the commands in the order listed in Table 4.1. 4.4.1 Set to Local Mode - 'M' This command places the instrument into local mode. Puts the instrument into local mode (see also R command).
Page 81: Set Scale Unit - 'S
: Operating Instructions 4.4.3 Set Scale Units - 'S' This command selects the pressure units. It takes the value 0 to 3. S0 to S2 select the units set-up for the function keys F1 to F3. S3 selects the units configured by the U command.
Page 82 DPI 520 User Manual Unit Symbol Unit U <argument> Pascal kilo-Pascal mega-Pascal mbar millibar kg/cm kilogram per square centimetre kg/m kilogram per square metre mmHg millimetre of mercury cmHg centimetre of mercury metre of mercury millimetre of water centimetre of water...
Page 83: Interrrupt -'I
: Operating Instructions 4.4.7 Interrupt - 'I' The interrupt command sets the instrument to return a message when a specified event has occurred. It takes the value 0 to 7 to determine the event as follows. 0 No interrupt - all interrupts are disabled. 1 Interrupt on “Error”.
Page 84: Controller On/Off - 'C
4-10 DPI 520 User Manual 4.4.9 Controller On/Off - 'C' Turns the controller on/off. it takes the value 0 or 1 as follows. 0 controller off 1 controller on Turns the controller on Example “C1” 4.4.10 Pressure Set-Point - 'P' This command allows a new pressure set-point to be entered.
Page 85: Error Reporting On/Off
4-11 : Operating Instructions 4.4.13 Error Reporting On/Off - '@' This command turns error reporting on or off. It takes the value 0 for OFF and 1 for ON. When turned ON, errors are reported as part of data output as defined in Section 4.5.
Page 86: Open Isolation Valve -'F
DPI 520 User Manual 4.4.18 Open Isolation Valve -'F' This command has been implemented for compatibility with the Druck DPI 510 pressure controller. It takes the value of either 20 (Isolation valve closed) or 21 (Isolation valve Open). Functionally, it controls the state of the isolation valve in the same way as the “E”...
Page 87: Output Code Format
4-13 : Operating Instructions Output Code Format The data sent consists of a data string of ASCII characters followed by the terminating characters programmed from the front panel. The general format is: <DATA><TERMINATOR> Where: <DATA>depends on Notation code/secondary address <TERMINATOR> is one of the following, set from the front panel SET-UP: <CRLF>...
Page 88 4-14 DPI 520 User Manual Notation Code = N1 Format: <value(7)><error/status code(3)><terminator> Example “ 0.0007@01” If no errors occur or error reporting is disabled then the error/status code is omitted. Notation Code = N2 Format: <mode(3)><range(2)><scale(2)><value source(2)> <controller status(2)><interrupt code(2)>...
Page 89 4-15 : Operating Instructions Notation Code = N7 The status condition of the instrument is sent as: <mode(3)><range(2)><scale(2)><value source(2)> <controller status(2)><interrupt code(2)> <notation code(2)><wait time(4)><terminator> Example “REMR1S3D1C0I0N4W002” Notation Code = N8 The full status condition of the instrument is sent as: <mode(3)><range(2)><scale(2)><value source(2)>...
Page 90: Parameter Definitions
4-16 DPI 520 User Manual Parameter Definitions ● ● ● ● ● value selected by the “D” command, signed integer Value or floating point. When the instrument value is sent, the format is a 6 digit value plus decimal point. The value can be preceded by spaces to complete the 6 digit value.
Page 91 4-17 : Operating Instructions Notation code N0 to N8 reports “N” status @0 or @1 reports “@” status Error reporting “W” followed by 3 digit ASCII value Wait time 0 or 1, 0 = out of limit, 1 = in limit Limit status Terminator code = String terminator...
Page 92: Error Status Code
Therefore the command was not executed. (see Sections 4.8.4 and 4.8.5) In DPI 520 mode, the error/status code is sent as an hexadecimal number representation of the error/status byte. In the DPI 500 and DPI 510 modes, bits 6 and 7 are not available and the error/status code is sent as an octal number.
Page 93: Rs232 Specific
4-19 : Operating Instructions RS232 Specific The RS232 operates in two modes direct and printer. In the direct mode the instrument is connected by a point-to-point connection to an “intelligent” controller (control computer). In the printer mode the instrument provides data spontaneously on a timed basis to drive a “nonintelligent”...
Page 94: Direct Mode
4-20 DPI 520 User Manual Determine the Handshaking Method required: Software Handshaking RTS and CTS are not connected which reduces the number of connections between instruments. Refer to Section 3 for installation details. Hardware Handshaking This system uses the RTS and CTS signals from the instruments to control data flow.
Page 95: Printer Mode
4-21 : Operating Instructions Printer Mode The printer mode allows for the automatic and continuous output of data to a non- programmable device such as a printer. In the printer mode, the output interval is programmed by the main instrument SET-UP menu as printer “N”...
Page 96 4-22 DPI 520 User Manual Assuming, for example that the address is set to 16 then :- “#L16” put the instrument into listen mode “#T16” causes the instrument to talk - send a reading depending on the ‘N’ and ‘D’ code.
Page 97 4-23 : Operating Instructions Addressed Commands ❍ ❍ ❍ ❍ ❍ The following commands will be acted on only when the instrument is a LISTENER. #(DCL) Device Clear, establishes a default condition as follows: (@00) Error status cleared. (NO) Notation code. (DO) Display code.
Page 98: Rs232 Output Code Format
4-24 DPI 520 User Manual 4.6.2 RS232 Output Code Format In computer format all output commands are as described in the OUTPUT CODES section. In the addressed mode the output is the same but will be enclosed in “{“ and “}”.
Page 99 4-25 : Operating Instructions Received Command = N2 Output is: CONTROLLER ON/OFF INTERRUPT ON/OFF/IN LIMIT/ERROR/EOC ISOLATION ON/OFF Received Command = N3 Output is: OUT OF LIMIT/IN LIMIT ERROR Error report if appropriate Received Command = N4 Output is: ERROR REPORTING ON/OFF MAX RATE/AUTO RATE/VAR RATE - ON RATE <Value(7)><Units(6)>”/s”...
Page 100: Operation Using Ieee 488
4-26 DPI 520 User Manual Received Command = N8 The full status condition of the instrument is returned as: <mode(3)><range(2)><scale(2)><value source(2)> <controller status(2)><interrupt code(2)><notation code(2)> <wait time(4)><error status(2)><terminator code(2)><rate(2)> <variable rate(8)><units(7)><tare(2),<tare value(8)><terminator> Example “REMR1S3D1C0I0N4W002@1E1J0V+000001.U PaT1B+000010.” Interrupt Data Interrupt data is generated spontaneously by the instrument when preset conditions have been achieved.
Page 101: Serial Poll
: Operating Instructions 4.7.1 Serial Poll The DPI 520 instrument will TALK in response to standard serial poll techniques. A single byte is sent whenever the instrument is programmed to TALK and the serial poll enable has been sent over the IEEE bus. The serial poll disable command discontinues the mode.
Page 102: Rs232 Command Specific Commands
4-28 DPI 520 User Manual 4.7.4 RS232 Command Specific Commands These commands are available only over addressed RS232. Function Command Checksum Action Global #(UNL) Unlisten #(UNT) Untalk #(IFC) Interface Clear #(ADD) Instrument Addresses Addressed #(DCL) Device Clear #(DIA) Dialogue Mode...
Page 103: Ascii Values
4-29 : Operating Instructions 4.7.6 ASCII Values Table 4.5, which provides details of the decimal values of the ASCII character set, is provided for reference purposes. Decimal ASCII Decimal ASCII SOH (CTRL-A) STX (CTRL-B) & ETX (CTRL-C) ‘ (Apostrophe) EOT (CTRL-D) ENG (CTRL-E) ACK (CTRL-F) BEL (CTRL-G)
Page 104 4-30 DPI 520 User Manual Decimal ASCII Decimal ASCII \ (or) _ (U/Line) (back quote) Table 4.5 (cont.) ASCII Values K163 Issue No. 3...
Page 105: Calibration
90 day intervals. The DPI 520 instrument is a very precise controller and measuring instrument and the test equipment and conditions of test must be suitable for the type of work. The use of a Class A compensated dead-weight tester is essential.
Page 106: Calibration Adjustment
DPI 520 User Manual Calibration Adjustment Before carrying out any calibration adjustments, the results of the calibration check should be studied to determine the nature of the deviations to be adjusted. If only offset (zero) and gain (full scale) are exhibited and the recorded measurements are otherwise essentially linear then only a ZERO and FULL SCALE adjustment is required.
Page 107: General Procedures
Conduct non-linearity compensation unless a calibration check shows excessive non-linearity. Conduct temperature compensation unless certain of the reason why the compen- sation has changed. Temperature compensation is only available on the high NOTE: accuracy DPI 520 models (options A1 and A2). K163 Issue No. 3...
Page 108: Using The Calibration Menu
DPI 520 User Manual Using the Calibration Menu The calibration routines are enabled by a switch located on the rear panel of the instrument. To select the Calibration mode, remove the sticker located on the rear panel of the instrument and set the Cal switch to the 1 position - to the right, looking at the rear panel of the instrument (e.g.)
Page 109: Calibration (Cal)
: Calibration 5.3.2 Calibration (Cal) Selection of this option of the calibration menu immediately initialises a calibration routine for the digital to analogue converters which is displayed as follows (e.g.), 2.565 Cal DAC Please Wait ..After a few seconds, the Cal menu will be displayed (e.g.) 2 Point Linearity Quit...
Page 110: Checking Linearity Calibration
DPI 520 User Manual Checking Linearity Calibration TURN OFF THE SOURCE PRESSURE AND VENT THE SYSTEM PRESSURE BEFORE DISCONNECTING OR CONNECTING ANY PRESSURE LINES. PROCEED WITH CARE. To check an instrument’s calibration, proceed as follows. Isolate and disconnect the pressure supply source.
Page 111: Full Scale And Zero Adjustment
: Calibration Full Scale and Zero Adjustment TURN OFF THE SOURCE PRESSURE AND VENT THE SYS- TEM PRESSURE BEFORE DISCONNECTING OR CONNECT- ING ANY PRESSURE LINES. PROCEED WITH CARE. To perform a zero and full scale adjustment, proceed as follows. Isolate and disconnect the pressure supply source.
Page 112: Non-Linearity Adjustment
DPI 520 User Manual After entry of the zero pressure, a prompt is given for the full scale pressure ❍ ❍ ❍ ❍ ❍ (e.g.) F.S. pressure ← ← ← ← ← Enter when stable Set the pressure standard to the required full scale pressure and allow time for the pressure reading to stabilise.
Page 113 : Calibration Select Linrty from the calibration menu and the following prompts will be ❍ ❍ ❍ ❍ ❍ displayed (e.g.) Pressure Pt 1 ← ← ← ← ← Enter when stable Set the pressure standard to the required lowest (zero) pressure allow time for the pressure reading to stabilise.
Page 114 5-10 DPI 520 User Manual After application of the last required pressure, select No from the Another ❍ ❍ ❍ ❍ ❍ point? prompt. If the last point available has been used the linearity calibration routine terminates automatically. Follow display prompts to exit calibration mode or the error message NOTE: "EEPROM Failure"...
Page 115: Maintenance
: Maintenance MAINTENANCE There are no user serviceable parts on the DPI 520 instrument other than the Source, Vent and Output manifold filters and the a.c. power supply fuses. Safety Instructions Observe the general safety procedures detailed at the beginning of this User ❍...
Page 116: Fuse Replacement
If the fuse(s) blow immediately on switch on, contact the manufacturer or ❍ ❍ ❍ ❍ ❍ Service Agent. A list of Druck Service Agents is given at the end of this section. DO NOT ATTEMPT ANY FURTHER SERVICING PROCEDURES...
Page 117 : Maintenance Figure 6.1 Power Supply Fuse Replacement K163 Issue No. 3...
Page 118: Replace Vent, Source And Outlet Manifold Filters
DO NOT USE SOLVENTS FOR CLEANING PURPOSES. Fault Finding In the event of an instrument malfunction, it can be returned to the Druck Service Department or Druck Agent for repair. A service charge price list is available which details the charges associated with various service functions.
Page 119: Error Codes
: Maintenance 6.5.1 Error Codes When the instrument detects an error, a code number is displayed the error and possible remedy for each code are listed in Table 6.1. Code Error Cause/remedy “Err001” Over-pressure Reduce source pressure “Err002” Lock mode on Remove lock - Sect 3.9.2 “Err003”...
Page 120: Controller Fault
DPI 520 User Manual 6.5.2 Controller Fault Symptoms - No outlet pressure when setpoint entered and controller switched on. Solution Check that the communications link is working. ● ● ● ● ● Check that source pressure is 110% of the F.S. pressure ●...
Page 121: Approved Service Agents
: Maintenance Approved Service Agents The following are approved agents for Druck Instruments. FRANCE JAPAN Druck S.A. Druck Japan KK, 19 Rue Maurice Pellerin, Medie Corp Building 8, 92600 Asniéres, 2-4-14 Kichijyoji-Honcho, France. Musashino, Tel: (331) 47 93 00 48...
Page 122 DPI 520 User Manual K163 Issue No. 3...

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