TABLE OF CONTENTS: GP485 - TDK
Contents
1. 5 1 Introduction 5 2 Function names 5 2 1 Default settings and related functions 5 2 2 List of functions by group 5 2 3 Alphabetical function 1 6 2122222 5 3 Command function syntax CHAPTER 6 22 4 6 1 Introduction 6 2 Units under warranty 6 3 Periodic maintenance 6 4 Adjustment and calibration 6 5 Part replacement and repairs 6 6 Fuse ratings USER S MANUAL 24 WARRANTY This Nemic Lambda product is warranted against defects in materials and workmanship for a period of three years from date of shipment During the warranty period Nemic Lambda will at it s option either repair or replace products which prove to be defective LIMITATION OF WARRANTY The warranty shall not apply to defects resulting from improper or inadequate usage or maintenance by the buyer buyer supplied products or interfacing The warranty shall not apply to defects resulting from unauthorized modifications or from operation exceeding the environmental specifications of the product Nemic Lambda does not warrant the buyers circuitry or malfunctions of Nemic Lambda products resulting from the buyer s circuitry Furthermore Nemic Lambda does not warrant any damage occurring as a result ofthe buyer s circuitry orthe buyer s supplied products No other warranty is expressed or im2. Figure 4 2 sample of address setting Rear panel direction t Table 4 3 shows the switch settings for the GP485 address and the corresponding serial device address Table 4 3 GPIB address switch settings for GP485 Switches GP485 Serial Port 8 6 4 Address Address OFF OFF OFF OFF OFF 0 1 ON OFF OFF OFF 1 2 OFF ON OFF OFF 2 3 ON ON OFF OFF 3 4 OFF OFF ON OFF OFF 4 5 ON OFF ON OFF OFF 5 6 OFF ON ON OFF 6 7 OFF OFF 7 8 OFF OFF ON OFF 8 9 ON OFF OFF ON OFF 9 10 OFF ON OFF ON OFF 10 11 ON ON OFF ON OFF 11 12 OFF OFF ON ON OFF 12 13 ON OFF ON ON OFF 13 14 OFF ON ON ON OFF 14 15 ON ON ON ON OFF 15 16 OFF OFF OFF ON 16 17 ON OFF OFF OFF ON 17 18 OFF ON OFF OFF ON 18 19 ON ON OFF OFF ON 19 20 OFF OFF ON OFF ON 20 21 ON OFF ON OFF ON 21 22 OFF ON ON OFF ON 22 23 ON ON ON OFF ON 23 24 OFF OFF ON ON 24 25 ON OFF OFF ON ON 25 26 OFF ON OFF ON ON 26 27 ON ON OFF ON ON 27 28 OFF OFF ON ON ON 28 29 ON OFF ON ON ON 29 30 OFF ON ON ON ON 30 0 m Uu 4 3 TURN ON CHECKOUT PROCEDURE 4 3 1 General The following procedure ensures that the GP485 controller is operational and may be used as a basic incoming inspection check 4 3 2 Prior to operation Check that the rear panel RS485 cable is connected as shown in Fig 3 3 Connect the GPIB cable between the GP485 and the h
3. TABLE OF CONTENTS GP485 n terr pee dr e pg 1 SAFETY INSTRUCTIONS 2 2 pg 2 CHAPTER 1 General Information pg 4 1 1 User s manual content 1 2 Introduction 1 2 1 General description 1 2 2 Configurations 1 2 3 Control via the GPIB port 1 2 4 Input output connections 1 3 Accessories 1 3 1 General 1 3 2 Serial link cable 1 3 3 AC cables CHAPTER 2 Specifications pg 5 2 1 GP485 specifications 2 2 Supplemental characteristics CHAPTER Installation and Configuration 3 1 General 3 2 Initial inspection 3 2 1 Mechanical inspection 3 2 2 Preparation for use 3 2 3 AC source requirements 3 3 Cooling and placement 3 4 Rack mounting 3 5 Repackaging for shipment 3 6 Power conriection ore eod ee RS pg 7 3 7 Connecting the cables 3 7 1 RS485 cable 3 7 2 GPIB cable 3 7 3 AC cord 3 8 Connections in a pg 8 3 9 RS485 connector pinout 3 10 Connecting GP485 to Zup power pg 9 3 11 The GPIB connector 3 12 Controller default configuration 33 Outline drawings ret trece ee eden pg 10 CHAPTER 4 Operating pg 1
4. gt RO O C SHIELD REMARKS SG GP485 TXD rear panel view TXD Twisted Pair RXD co lo oz coo RXD Twisted Pair 3 11 THE GPIB CONNECTOR The GPIB connector is a standard 24 pin shielded Champ female connector with metric screwlock hardware Fig 3 5 shows a diagram of the GPIB connector and the signals supported The suffix indicates that the signal is active low Fig 3 5 The GPIB Connector and Signal Designations RXD SG TXD RX RS232 TXD Not Used SHIELD Zup Unit rear panel view Fig 3 4 Connecting GP485 to Zup power supply via RS485 cable Twisted Pair with DAV Twisted Pair with NRFD Twisted Pair with NDAC Twisted Pair with IFC Twisted Pair with SRQ Twisted Pair with ATN L GROUND GND SIGN 3 12 CONTROLLER DEFAULT CONFIGURATION The GP485 power up default setting is as follows GPIB address the GP485 is shipped from Factory with address 0 8 data bits character 1 stop bit character no parity 9600 baud rate If you want to change any default settings you must change the DIP switch settings or set it by software To change the DIP switch shut down the system and then refer to Par 4 2 3 To change the serial port setting referto table 5 5 sps command 9 0L 3 13 OUTLINE
5. 13 CALL IBWRT GP485 WRT The programming message WRT contains eos which is the function name x and 10 are the arguments and CHR is the terminating carriage return This programming message tells the GP485 to assert the EOI line when it sends the end of string character linefeed The second line of the example is a NI 488 2 function call that allows a personal computer to control the GPIB from Microsoft BASIC This function outputs the string in WRT to the GP485 4 6 2 How messages are processed The GP485 processes each programming message on line by line basis When the GP485 receives a message it buffers the message interprets the function name and arguments then executes the message 4 7 FUNCTION ARGUMENTS When typing in a function separate the first argument from the function name with at least one space Separate each additional argument with at least one space or a comma In the syntax portions of the function descriptions in Table 5 5 the square brackets that enclosed some arguments indicate that those arguments are optional Do not enterthe brackets as part ofthe argument 4 7 1 Abbreviations for arguments The term bool is an abbreviation used for an argument in the functions description The values for bool are 1 true on or enable 0 false off or disable 4 88 ADDRESSING THE GP485 AND SERIAL PORT The GP485 uses dual addressing to determine what type of GPIB data is being processed With dual addr
6. connections are securely tightened before applying power 3 7 1 RS485 cable Connect one end of the serial communication cable to the RS485 OUT connector located on the GP485 rear panel Connect the other end of the cable to the Zup power supply RS485 232 IN connector Be sure to use only shielded cable and follow the RS485 cabling restrictions 3 7 2 GPIB cable Connect one end of the GPIB cable to the GPIB connector located on the GP485 rear panel and tighten the thumb screws on the connector Connect the other end to the GPIB connector on the GPIB controller Be sure to use only shielded cable and follow all IEEE488 cabling restrictions 3 7 3 AC cord Connect the AC cord to the GP485 ac input connector located on the rear panel then connect the plug to outlet of the correct voltage as specified in the specifications in chapter 2 3 8 CONNECTIONS A SYSTEM GPIB BUS RS485 ZUP 1 Fig 3 1 System connections 3 9 RS485 CONNECTOR PINOUT Fig 3 2 The RS485 connector pinout 8 TXD j view of GP485 rear 7 6 TXD 5 E 5 4 RXD 3 NC 2 RXD 1 Not used Shield connector enclosure 3 10 CONNECTING GP485 TO ZUP POWER SUPPLY Fig 3 3 GP485 to ZUP cable layout 1 d 6 0 8 i RS485 RS485 232 IN RXD TX RS232
7. count which indicates the number of bytes currently contained in the GP485 serial port receive buffer The GP485 returns a lt CR gt lt LF gt following each piece of the response and asserts EOI with the final lt LF gt that comes after count 23 Table 5 5 functions syntax contd Status represents a combination of GP485 conditions Inside the GP485 status is stored as a 16 bit integer Each bit in the integer represents a single condition A bit value of 1 indicates the corresponding condition is in effect A bit value of 0 indicates the condition is not in effect Because more than one GP485 condition can exist at one time more than one bit can be set in status The highest order bit of status also called the sign bit is set when the GP485 detects either a GPIB error or a serial port error when status is negative an error condition exists Table 5 5 2 lists the values and descriptions of GPIB status conditions that might be returned by the stat function Table 5 5 2 GP485 conditions returned by stat n 5 Description Bit 32768 ERR Error detected 15 16384 Reserved 14 8192 Reserved 13 4096 Reserved 12 2048 Reserved 11 1024 Reserved 10 512 Reserved 9 256 CMPL Operation completed 8 128 Reserved 7 64 Reserved 6 32 Reserved 5 16 Reserved 4 8 Reserved 3 4 Reserved 2 2 Reserved 1 1 Reserved 0 Table 5 5 3 l
8. in transit Keep all packing materials until inspection has been completed If any damage is detected file a claim with the carrier immediately and notify the Nemic Lambda sales or service facility nearest you 3 2 1 Mechanical inspection The mechanical inspection should confirm that there is no exterior damage to the GP485 such as broken connectors and front panel are not scratched or cracked 3 2 2 Preparation for use In order to be operational the GP485 must be connected to an appropriate AC source The line voltage must be within the GP485 specification DO NOT apply power before reading paragraph 3 2 3 3 2 3 AC Source requirements The GP485 can be operated from a nominal 100V to 240V single phase 47 63Hz The input voltage range and current required is specified in chapter 2 Make sure that the AC voltage does not fall below low limit specifications 3 3 COOLING AND PLACEMENT The GP485 should be used in an area where the ambient temperature does not exceed 50 Do not install the GP485 adjacent to a hot surface or heat generating equipment 3 4 RACK MOUNTING GP485 can be mounted in a standard 19 rack 3U height and occupy 1 6 rack length The GP485 should be fixed by M4 screws replacing the rubber feet on the bottom of the GP485 Screws must not protrude more than 6mm into the unit Refer to the outline drawing in this chapter for mounting details 3 5 REPACKAGING FOR SHIPMENT To ensure safe transportation of t
9. talk Not used Not used To determine the mask value add up the hex or decimal values of each condition of which SRQ is to be asserted Example for asserting SRQ on GPIB errors and serial port errors mask 12 4 for GERR and 8 for SERR srqen mode is disabled by default SRQ never asserted call srqen without an argument returns a decimal string that indicates the current setting srqen remains in effect until srqen called again call onl or turn off GP485 Example 1 WRT srqen 0 CHR 13 Never assert SRQ CALL IBWRT GP485 WRT 2 WRT srqen 4 CHR 13 Asserts SRQ when a CALL IBWRT GP485 WRT GPIB error occurs stat lt gt or stat c s lt CR gt or stat c n s lt CR gt Use stat to obtain the status of the GP485 to see if certain conditions are currently present stat is used to see if the previous operation resulted in an error n Returned status information as numeric string 5 Returned status information in symbolic format mnemonic string c Returns status information after each programming message eliminating the need to call stat after each programming message Call stat without an argument continuous status reporting is disabled When calling stat with both n and s modes specified the numeric status is always returned first The stat contains four pieces of information GP485 status GPIB error code serial error code and a
10. to 14 controllers Each controller can control up to 31 Zup units in dual GPIB addresses One address to configure itself and one to communicate with the Zup units 1 2 3 Control via the GPIB port The following parameters can be programmed via the GPIB communication port 1 GP485 configuration 2 Zup parameters refer to Zup User s Manual Par 1 2 3 1 2 4 Input Output connections Connections of AC source GPIB port and RS485 port are made to rear panel connectors AC input IEC inlet GPIB port Standard 24 shielded champ female connector RS485 port EIA 568A shielded connector 1 3 ACCESSORIES 1 3 1 General Accessories are delivered with the GP485 upon ordering Below are listed possible accessories and ordering numbers ORDER DESCRIPTION NL100 19 rack 3U height NL101 Blank panel for 19 rack NL103 Additional User s Manual 1 3 2 Serial link cable Serial link cable for linking the GP485 to the Zup units via RS485 communication is provided with each GP485 Cable description 0 5m typ length shielded EIA 568A type plugs 8 contacts 1 3 3 AC Cables PARTNo MARKET DESCRIPTION NC301 USA 15A 125V unshielded 2m typ length with IEC320 connector on one side and NEMA 5 15P connector on the other side NC302 EUROPE 10A 250V unshielded 2m typ length with IEC320 connector on one side and INT L standard VII dual earthing on the other side NC303 GENERAL 10A 250V unshielded 2m typ length with IEC320 conn
11. 1 4 1 Introduction 4 2 Controls and indicators 4 2 1 Front panel 4 2 2 Rear panel 3 inpr t dead pg 12 4 2 3 TOP panel scu niinc pg 13 TABLE CONTENTS GP485 4 3 Turn on checkout 4 3 1 General 4 3 2 Prior to operation 4 3 3 Power on 4 4 Status information and error handling characteristic 4 5 Programming considerations 4 6 Programming message 4 6 1 Programming message example 4 6 2 How messages are processed 4 7 Function arguments 4 7 1 Abbreviations for arguments 4 8 Addressing the GP485 and serial port 4 8 1 Address of the GP485 4 8 2 Address of the serial port 4 8 3 Addressing the GP485 and serial device as listeners 4 8 4 Addressing the GP485 and serial device as talkers 4 9 GPIB read and write termination methods END and EOS 4 10 Serial port transmission 4 11 Operation of the GP485 as a GPIB device 4 12 Serial poll responses 4 13 Service request SRQ eene 4 13 1 Service Request at Power On 4 13 2 SRQ conditions 4 13 3 SRQ generation by the GP485 4 13 4 SRQ generation by Zup Power Supply 4 13 5 GP485 initialize for using SRQ 4 14 Parallel polls tise 2 aree cr t ete te e eee dete 4 14 1 Take control TCT 4 14 2 Group execute trigger GET 4 14 3 Go to local GTL 4 14 4 Device clear CHAPTER 5 Functions and
12. DRAWING MODEL NAME WILL BE SHOWN HERE 124 0 0 5 8 5 oor 10 POWER 3 48 0 1 0 1 MOUNTING SCREWS MUST PROTRUDE INTO THE POWER SUPPLY MORE THAN 6mm 2 GPIB CONNECTOR SHIELDED 24 PIN CHAMP FEMALE CONNECTOR WITH METRIC SCREWLOCK 3 RS485 CONNECTOR EIA 568A 8 CONTACTS SHIELDED CONNECTOR REMOVABLE COVER FOR 350 0 1 0 ADDRESS DIP SWITCH SETTING RS485 CONNECTOR see note 3 GPIB CONNECTOR see note 2 8 7 290 0 1 0 201 5 0 5 48 4 0 5 MOUNTING HOLES 4 4 PLACES MARKED see note 1 20 INPUT VOLTAGE AND AC INLET CURRENT RATING WILL BE SHOWN HERE RUBBER BUMPERS 4 PLACES MARKED removable CHAPTER 4 OPERATING INSTRUCTIONS 4 1 INTRODUCTION This chapter describes the operating modes controls and indicators of the GP485 controller It also describes how to program the GP485 controller status and error handling information programming considerations programming messages function arguments addressing GPIB read and write termination methods serial port transmissions and mode functions 4 2 CONTROLS AND INDICATORS 4 2 1 Front panel GF ant BAe OTIO iE TE i Fig 4 1 Front panel controls and indicators Table 4 1 Frontpanel control
13. KV Communication Lines 1000 4 6 1996 3V 1000 4 11 1994 1000 3 2 1995 1000 3 3 1995 The product herewith complies with the requirements of the Low Voltage Directive 73 23 EEC and the EMC directive 89 336 EEC for Electrical Equipment used in Measurement Control and Laboratory environments and carries the CE mark accordingly Our importer to the EU is Coutant Lambda Limited located at Kingsley Avenue Ilfracombe Devon EX34 8ES UK Further all products covered by this declaration are manufactured by processes which ensure continued compliance of the products with the requirements of the Low voltage and the EMC directives Name of Authorized Signatory Ada z Szczerbo Signature of Authorized Signatory Position of Authorized Signatory Managing Director Coutant Lambda Date 25 1 19 49 Place where signed Ilfracombe UK
14. ance to various safety specs UL IEC etc are required to be described as 100 240VAC 50 60Hz on name plate 2 At cold start Ta 25 C 2 2 SUPPLEMENTAL CHARACTERISTICS The supplemental characteristics give typical but non warranted performance characteristics The supplemental characteristics are useful in accessing applications for the GPIB controller Types of supplemental characteristics are listed below 1 RELIABILITY DATA Reliability performance of the controller 2 IEC1000 DATA Performance of the controller under IEC 1000 test conditions 3 EMI DATA Typical EMI Conducted and Radiated performance of the controller The supplemetal characteristics data are held in each Nemic Lambda sales and service facility For further details please contact the Nemic Lambda representative nearest you 5 CHAPTER 3 INSTALLATION AND CONFIGURATION 3 1 GENERAL This chapter contains instructions for initial inspection preparation for use and repackaging for shipment Connection to PC and Zup power supplies is described in Par 3 7 3 11 NOTE GP485 generates a magnetic field which might affect the operation of other instruments If your equipment is susceptible to magnetic fields do not position adjacent to the GP485 3 2 INITIAL INSPECTION Prior to shipment the GP485 was inspected and found free of mechanical or electrical defects Upon unpacking of the GP485 inspect for any damage which may have occurred
15. buffer and sends them to the user 3 Find out if the serial power supply has sent more bytes to the GP485 by asking the GP485 to send status information a Sendthe GP485 it s listen address b Send the programming message stat n to the GP485 c Send the GP485 it s talk address d Perform a GPIB read of 20 bytes The GP485 sends it s status information terminated by the GPIB END message If the GP485 receives it s talk address but has nothing to send it responds to GPIB reads with a carriage return and a linefeed accompanied by END The status information returned contains the number of bytes remaining in the serial port receive buffer This information helps the user to decide how much data to continue to collect from the serial device The TALK LED on the GP485 is lit when either the GP485 or the serial power supply is addressed to talk 16 4 9 GPIB READ AND WRITE TERMINATION METHODS END and EOS The IEEE 488 specification defines two ways that GPIB Talkers and Listeners can identify the last byte of data messages END and EOS The two methods permit a Talker to send data massages of any length without the Listener s knowing the number of transmission bytes in advance END and EOS can be used individually or in combination but the Listener must be configured to detect the end of transmission END message The Talker asserts the EOI End or Identify signal while the last data byte is being transmitted The Lis
16. ector on one side andunterminated striped wires on the other side Use the cable only with plug approved by the national safety standards ofthe country of usage 4 CHAPTER 2 SPECIFICATIONS 2 1 GP485 SPECIFICATIONS 1 Input Voltage freq 4 85 265Vac continuous 47 63Hz 2 Input Current 100 200Vac Less than 0 14A at 100V 0 07A at 200V 3 Inrush Current 100 200Vac 2 15 30 4 IEEE488 capability SH1 AH1 T6 L4 LEO SR1 RLO PP1 DC1 DTO CO E1 E2 5 Baud rate bps Default 9600 Optional 300 600 1200 2400 4800 6 Indications LED s Power Ready Talk Listen SRQ 7 Operating temp C 0 50 8 Storage temp 20 70 9 Operating humidity 30 90 RH no dew drop 10 Storage humidity 10 90 RH no dew drop 11 Conducted emission EN55022B VCCI 2 FCC part 15 class B 12 Radiated emmision EN55022B VCCI 2 FCC part 15 class B 13 Weight Kg 1 95 14 Size W H D m 70x124x350 15 Applicable safety standards UL3111 1 EN61010 1 16 Applicable EMC standards EN61326 1 IEC61326 1 17 Withstand voltage Input Output 3KVac Input Chassis 1 5KVac Output Chassis 500Vac 18 Leakage current Less than 0 4 19 Vibration with mounting screws G 1 55Hz Amp sweep 1 min less than 2G X Y Z 1hour each 20 Shock G Less than 20 Notes 1 For cases where conform
17. ervice SRQ asserted 18 4 13 5 GP485 initialize for using SRQ WRT srq 16 CHR 13 enable to assert SRQ if the GP485 serial buffer not empty CALL IBWRT GP485 WRT and the serial device not addressed to talk 4 14 PARALLEL POLL The GP485 sets the ist individual status bit whenever it asserts SRQ and clears ist whenever it unasserts SRQ The GP485 implements IEEE 488 Parallel Poll PP interface function subset PP1 This means it cannot configure itself to respond to parallel polls It must be configured remotely by an external Controller 4 14 1 Take Control TCT This command has no effect on the GP485 It would not make sense for control to pass to the GP485 since all programming messages and GPIB commands must be sentto itfrom another GPIB device 4 14 2 Group Execute Trigger GET This command has no effect on the GP485 4 14 3 Go To Local GTL This command has no effect on the GP485 4 14 4 Device Clear When the GP485 receives the universal Device Clear DCL command or when it receives It s listen address and the Selected Device Clear SDC command it clears both it s status buffer and it s serial port receive buffer It also resets the GPIB serial poll response byte to zero and unasserts SRQ 19 CHAPTER 5 FUNCTIONS AND COMMANDS 5 1 INTRODUCTION This chapter contains descriptions of the mode functions that can be used to program t
18. essing the GP485 recognizes two different GPIB addresses The first address is the GP485 address When the GP485 receives it s own address the data received is referred to as programming messages the data it sends is referred to as status information The second address is the serial port address When the GP485 receives the serial port address the data it sends and receives is referred to as serial data 4 8 1 Address of the GP485 The address of the GP485 is the primary address set with the DIP switch on the top panel Par 4 2 3 with the secondary addressing disabled 15 4 8 2 Address of the serial port The address of the serial port is the GP485 address plus 1 with the secondary addressing disabled However if primary address of 30 with the configuration switch is selected the serial port is at 0 The primary address is set with the DIP switch on the top panel refer to Par 4 2 3 4 8 3 Addressing the GP485 and serial device as listeners When the GP485 receives it s own listen address it examines the data received over the GPIB treats it as a programming message and takes action based on that data When the GP485 receives the serial device listen address it forwards the data over the GPIB to the serial port without examining or modifying the data For example to send a command from user s computer over the GPIB to the power supply Before sending the command to the serial port the GP485 must be configured t
19. he GP485 These functions are in alphabetical order for easy reference order by group and explanations how to use 5 2 FUNCTION NAMES The function names have been selected to indicate the purpose of each function thereby making programs easy to understand However if user s prefer to reduce some overhead in the program and do not mind giving up these advantages use only as much of the function name as is necessary to distinguish it from other functions This abbreviated form of the function name is shown in bold text in the function tables and in the syntax portions of the function descriptions 5 2 1 Default settings and related functions Tables 5 1 and 5 2 list power on characteristics of the GP485 and the functions that be used to change those characteristics Table 5 1 Serial Port Characteristics Characteristic Power on value Related function Echo bytes to serial port No Enable serial port communication Yes Baud rate 9600 Parity None Bits 8 Stop bits 1 Send XON XOFF No Recognize XON XOFF No Report serial errors No Table 5 2 GPIB Characteristics Characteristic Power on value End of string modes None Allow GP485 to assert SRQ No Related function 5 2 2 List of functions by group The GP485 functions are divided into three groups GPIB functions serial port functions and general use functions These groups are defined in Table 5 3 Table 5 3 Functions b
20. he instrument it is recommended to use the original package The original packaging material is reusable If the original package is not available contact the Nemic Lambda Sales or service facility near you for details on obtaining suitable packaging and shipping information Please attach a tag to the GP485 unit describing the problem and specifying the owner model number and serial number of the unit 3 6 POWER CONNECTION CAUTION Connection of the GP485 to an AC source should be made by an electrician or other qualified personnel The GP485 is equipped with a three conductor power cable The third conductor is the ground conductor When the cable is plugged in to an appropriate receptacle the GP485 is grounded Under no circumstances should the GP485 be operated without an adequate ground connection If a two contact receptacle is encountered it must be replaced by a three contact receptacle properly grounded This operation should be done by a qualified electrician It is recommended to keep the AC input wires separate from the communication cables to avoid interference WARNING Some components inside the GP485 are at AC voltage even when the On Off switch is in the Off position To avoid the hazard of electric shock disconnect line cord and wait 2 minutes before removing cover 3 7 CONNECTING THE CABLES WARNING Turn off the AC input power before making or changing any rear panel connection Make sure that all
21. icated conditions are fully understood and met FCC COMPLIANCE NOTICE Note This equipment has been tested and found to comply with the limits for a Class A digital device pursuantto part 15 ofthe FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference athis own expense CHAPTER 1 GENERAL INFORMATION 1 1 USER S MANUAL CONTENT This user s manual contains the operating instructions installation instructions and specifications of the GP485 For information related to operation with the Zup Series refer to Nemic Lambda s Zup User s Manual 1 2 INTRODUCTION 1 2 1 General description The GP485 is a high performance GPIB to RS485 interface It enables a computer with a GPIB port to communicate with up to 31 Zup power supplies via a single GP485 unit The GP485 has all the software and logic required to implement the physical and electrical specifications of the IEEE488 and RS485 standards 1 2 2 Configurations The GP485 can be configured into a GPIB system of up
22. ists the values and descriptions of GPIB error conditions that might be returned by stat Table 5 5 4 lists the serial port errors that might be returned by stat Table 5 5 3 GPIB error conditions returned by stat Value a Description 0 NGER No GPIB error condition to report 1 Reserved 2 Reserved 3 Reserved 4 EARG Invalid argument or arguments 5 Reserved 6 Reserved 7 10 Reserved 11 ECAP No capability for operation 12 16 Reserved 17 ECMD Unrecognized command 24 Table 5 5 functions syntax contd Table 5 5 4 Numeric Symbolic Serial port error Value Value 5 Description conditions returned by stat No serial port error condition to report Serial port parity error Serial port overrun error Serial port receive buffer overflow EFRM Serial port framing error AJ oj N gt Example 10 on continuous status reporting 20 in numeric format 30 WRT stat c n CHR 13 40 IBWRT GP485 WRT 50 If we have 3 bytes in the serial port 60 buffer a typical response would be 70 256 lt CR gt lt LF gt 0 lt CR gt lt LF gt 0 lt CR gt lt LF gt 3 lt CR gt lt LF gt 80 Read the GP485 status read 30 90 bytes or until EOI is received 100 RD SPACE 30 110 CALL IBRD GP485 RD 120 Print the status information 130 Print GP485 stat
23. lt LF gt CALL IBRD GP485 RESP eos X B eoschar CR Use eos to enable the GP485 to assert EOI and add GPIB END message to the data string sent by the serial device when the string contains the specified end of string character eos applies only when the 485 has received the serial power supply talk address and is sending serial data to the GPIB X B set EOI with eos XEOS and compare all 8 bits of EOS bytes BIN eos D lt CR gt when sending data from the power supply D EOS mode disable EOS mode is diabled by default call eos without an argument returns it s current status The assignment made by this function remains in effect until eos called again call onl or turn off the GP485 Example 1 WRT EOS X B 10 CHR 13 send EOI with CR CALL IBWRT GP485 WRT compare 8 bit 2 WRT eos CHR 13 What is the current status CALL IBWRT GP485 WRT CALL IBRD GP485 RESP RESP contains X B 10 lt CR gt lt LF gt Note The Zup power supply series default termination is lt LF gt therefore 1 should be performed at each power on of the GP485 21 Table 5 5 functions syntax contd onl bool lt CR gt spign bool lt CR gt Use onl to disable communications between GP485 and serial port or to reset the GP485 characteristic to it s default values Placing the GP485 offline is like disconnecting it s serial cable fr
24. o GPIB commands 4 12 SERIAL POLL RESPONSES When serial polled the GP485 returns status information to the GPIB controller through the serial poll response byte The GP485 maintains this status byte throughout operation regardless of the srqen configuration Table 4 4 lists the meaning of each bit in the serial poll response byte Table 4 4 Serial port response byte Bit Mnemonic Meaning 0 Not used Serial port receive buffer is full and serial device not addressed to talk 2 GERR GPIB error see stat Table 5 5 3 SERR Serial error see stat Table 5 5 Serial port receive buffer not empty and serial device not addressed to talk 5 EOS EOS character received and serial device not addressed to talk 6 RQS Request service SRQ asserted 7 Not used 17 4 13 SERVICE REQUEST SRQ 4 13 1Service Request at Power On After Power On the GP485 defaults to never asserting service request Using the srqen function the GP485 can be programmed to assert SRQ undera variety of cases 4 13 2 SRQ conditions GP485 will assert SRQ ina variety of cases related to the operation of the GP485 itself and also to the operation ofthe Zup units connected to the GP485 serial port 4 13 3 SRQ generation by the GP485 The GP485 will assert SRQ under any ofthe following circumstances 1 When a GPIB error occurs thatis EARG ECMD or ECAP as reported by stat 2 When a serial port error
25. o the suitable serial port parameters Follow these steps to send a command from a computer to a Zup power supply connected to the serial port 1 Address the GP485 to listen by sending it s listen address 2 Send the programming message sps 9600 8 1 to the GP485 The GP485 interprets this programming message and acts upon it without sending any data on to the serial device 3 Address the serial port to listen by sending the serial device listen address to the GP485 4 Send the command over the GPIB The GP485 sends the command to the power supply without examining it for meaning The LISTEN LED on the GP485 is lit when either the GP485 or the serial device is addressed to listen 4 8 4 Addressing the GP485 and serial device as talkers When the GP485 receives it s own talk address it sends out status information When the GP485 receives the serial device talk address it sends data out to the GPIB that it has received from the serial device For example User requests power supply to return status information Follow the following steps to retrieve the data 1 Address the serial power supply to talk by sending the serial device talk address to the GP485 If the GP485 receives the serial device talk address but has no data in it s serial port receive buffer to send itwaits for data from the serial power supply to fill the request 2 Perform a GPIB read of 100 bytes The GP485 retrieves 100 bytes from it s serial port receive
26. occurs that is EORN EOFL or EFMR as reported by stat 3 When the serial device is not addressed as atalker and sends a message to the GP485 4 13 4 SRQ generation by Zup Power Supply A Zup Power Supply will send a string message in the event of Foldback Protection activation Over Voltage Protection or Over Temperature Protection For more details about the SRQ commands queries referto Zup User s Manual The Zup Power Supply will send the message when it is not addressed as a talker and thus will cause the GP485 to assert SRQ The message consists of three characters and terminated with lt CR gt lt LF gt The first character identifies the cause 1 Foldback 2 OVP 3 The 2nd and 3rd characters identify the Power Supply address The Zup Power Supply will be not addressed as a talker if the last command is operational command or DCL Example String generated by a Zup unit 120 lt CR gt lt LF gt means foldback protection was activated in power supply address 20 The SRQ can be identified by serial or parallel poll Refer to par 4 12 and 4 14 for details If using serial poll the serial poll response register decimal value is 112 Table 4 5 serial poll response Bit Decimal Mnemonic Description 4 16 BNE Serial port receive buffer not empty and serial device not addressed to talk 5 32 EOS EOS character received and serial device not addressed to talk 6 64 RQS Request s
27. ogrammed using any language that has access to a GPIB port The following NI 488 2 function call addresses the GP485 to listen and sends it the programming message spset followed by a carriage return WRT SPSET CHR 13 CALL IBWRT GP485 WRT If not using the National Instruments NI 488 2 software be sure your program properly addresses the GP485 and the serial device when writing to and reading from them In the function syntax descriptions arguments shown in square brackets 1 are optional Do not enter the brackets as part of the argument Function name abbreviations can be used which include as many characters as necessary to distinguish them from other functions The abbreviated forms are indicated by bold text in the syntax description of each function 14 4 66 PROGRAMMING MESSAGE FORMAT You can program the GP485 by sending it programming messages which are ASCII strings via it s GPIB port Each programming message is terminated with a carriage return CR alinefeed lt LF gt or a carriage return followed by a linefeed lt CR gt lt LF gt This is denoted by CR in the syntax portions of the function descriptions and by CHR 13 in the BASIC examples Programming messages can be entered in any combination of uppercase and lowercase letters 4 6 1 Programming message example The following lines of code are an example of a programming message in BASIC WRTS eos x 10 CHR
28. om the serial device bool 0 offline 1 online GP485 is online by default Call onl without an argument returns it s current status Example 1 WRT onl 1 CHR 13 Puts GP485 online CALL IBWRT GP485 WRT and restores power up values 2 WRT ONL 0 CHR 13 Puts GP485 offline CALL IBWRT GP485 WRT Use to ignore or not ignore the occurrence of serial port errors If not to ignore the GP485 does not store characters that contain serial errors Also the error is indicated in the serial error code that is returned by the stat function If to ignore the GP485 stores serial port errors in the buffer which are later sent out of the GPIB port when the serial device is talk addressed No error serial code is reported by stat function By default the GP485 ignores serial port errors The serial port errors include parity overrun framing and overflow errors bool 0 don t ignore serial port errors 1 ignore serial port errors Call spign without an argument the GP485 returns the current seting spign remains in effect until spign called again call onl or turn off GP485 Example 1 WRT spign 0 CHR 13 Do not ignore CALL IBWRT GP485 WRT Serial port errors 2 WRT spign 1 CHR 13 Ignore serial port CALL IBWRT GP485 WRT errors spset baud parity databits stopbits lt CR gt Use spset at the beginning of the program to set the GP485 serial port characteristics baud
29. omponent replacement is allowed by non Nemic Lambda qualified service personnel Never replace components with power cable connected To avoid injuries always disconnect power discharge circuits and remove external voltage sources before touching components PART SUBSTITUTIONS AND MODIFICATIONS Part substitutions and modifications are allowed by authorized Nemic Lambda service personnel only For repairs or modifications the instrument must be returned to a Nemic Lambda service facility ENVIRONMENTAL CONDITIONS The GP485 series safety approval applies to the following operating conditions Indoor use Ambient temperature 0 C to 50 Maximum relative humidity 90 no dew drop Altitude up to 3 000 m Pollution degree 2 SAFETY INSTRUCTIONS SAFETY SYMBOLS Instruction manual symbol The instrument will be marked with this symbol when it is necessary for the user to refer to the instruction manual 5 Indicates hazardous voltage Indicates ground terminal WARNING The WARNING sign denotes a hazard An attention to a procedure is called Notfollowing procedure correctly could result in personal injury AWARNING sign should not be skipped and all indicated conditions must be fully understood and met CAUTION The CAUTION sign denotes a hazard An attention to a procedure is called Not following procedure correctly could result in damage to the equipment Do not proceed beyond a CAUTION sign until all ind
30. ost computer Refer to Fig 3 4 for GPIB connector description Connect the GP485 to an AC source as described in paragraph 3 6 4 3 3 Power Turn on the GP485 Wait approx 5 seconds until the Power Ready led illuminates so the self test can be completed and the unit is ready for operation Change the GP485 communication configuration as follows 1 Set the end of message to lt LF gt see table 5 5 eos 2 Set the baud rate to same as the Z UP power supply see table 5 5 spset 4 4 STATUS INFORMATION AND ERROR HANDLING CHARACTERISTIC The functions description in Table 5 5 explains that the GP485 records specific status and error information This means that it stores that information in it s memory so that it is available when requested by the user The functions description also include an explanation on return of information to the user from the GP485 This is accomplished by information sent to the user from the GP485 over the GPIB The GP485 continuously monitors the serial port for transmission errors If an error is encountered in the serial data the GP485 records the error The GP485 can be programmed to ignore serial port errors using the spign function 4 5 PROGRAMMING CONSIDERATIONS The program examples within the functions description are written in Microsoft QuickBASIC Version 4 5 using National Instruments NI 488 2 function calls Although the examples in this manual are written in BASIC The GP485 can be pr
31. plied WARRANTY SERVICE This product must be returned to an authorized Nemic Lambda service facility for repairs or other warranty service For products returned to Nemic Lambda for warranty service the buyer shall prepay shipping charges to Nemic Lambda and Nemic Lambda shall pay the shipping charges to return the productto the buyer DISCLAIMER The information contained in this document is subject to change without notice Nemic Lambda shall not be liable for errors contained in this document or for incidental or consequential damages in connection with the furnishing performance or use of this material No part of this document may be photocopied reproduced or translated into another language without the prior written consent of Nemic Lambda TRADEMARK INFORMATION Microsoft and Windows are trademarks of Microsoft Corporation SAFETY INSTRUCTIONS CAUTION The following safety precaution must be observed during all phases of operation service and repair of this equipment Failure to comply with the safety precautions or warnings in this document violates safety standards of design manufacture and intended use of this equipment and may impair the built in protections within Nemic Lambda shall not be liable for user s failure to comply with these requirements INSTALLATION CATEGORY The GP485 Series has been evaluated to INSTALLATION CATEGORY II Installation Category over voltage category Il local le
32. rate parity data bits and stop bits to match the Zup power supply Possible values baud bits s 300 600 1200 2400 4800 9600 parity none even odd data bits b c 7 8 stop bits 1 2 default values 9600 n 8 1 spset without an argument returns it s current serial port configuration spset remains in effect until spset is called again call onl or turn off GP485 Example 1 WRT spset 1200 n CHR 13 Set the serial port use CALL IBWRT GP485 WRT 1200 b s no parity 2 WRT spset CHR 13 What are current serial CALL IBWRT GP485 WRT port settings CALL IBRD GP485 RESP RESP will contain 1200 n 8 1 lt CR gt lt LF gt Note The Zup power supply series data format is no parity 8 data bits and one stop bit therefore the user needs to set only the baud rate 22 Table 5 5 functions syntax contd srqen mask lt CR gt Use srqen to allow the GP485 to assert SRQ under the conditions described in Table 5 5 1 mask 0 never assert SRQ gt 0 assert SRQ according to Table 5 5 1 Table 5 5 1 SRQ mask bits Bit E a Description Not used Serial port receive buffer full and serial device not addressed to talk GPIB error see stat Serial error see stat Serial port receive buffer not empty and serial device not addressed to talk EOS character received and serial device not addressed to
33. ries rated 250V 2A 26 GP485 USER S MANUAL INDEX A ac cables ac cord accessories addressing cooling configuration connections in a system connecting the cables D default settings E eos echo F fuse front panel functions G grounding GPIB cable indicators L listener O outline drawing onl P programming considerations power on programming message parallel poll 4 6 15 16 NOOO 20 17 21 2 26 11 20 21 11 16 R rack mounting RS485 cable rear panel 5 serial link cable safety simbols stat serial poll srq spign spset srqen T top panel talker turn on 7 8 9 12 4 9 3 17 23 24 25 17 18 23 27 s NEMIC LAMBDA LTD KARMIEL INDUSTRIAL ZONE POB 500 ZC 20101 ISRAEL TEL 972 4 9887491 972 4 9887487 DECLARATION OF CONFORMITY We Nemic Lambda Ltd located at Karmiel Industrial zone Israel declare under our sole responsibility that the product ProductName GPIB RS485 CONTROLLER Model GP485 Conforms to the following product specifications Safety EN61010 1 1993 EN61010 1 A2 1995 Electromagnetic Emissions EN55011 1991 Conducted Emissions Class B Radiated Emissions Class B IEC1000 4 2 1995 4 0KV CD 4 0KV AD IEC1000 4 3 1995 3V m 1000 4 4 1995 1 0KV AC Power Lines 0 5KV Communication Lines 1000 4 5 1995 2 0KV AC Power Lines 1 0KV AC to Ground 1 0
34. s and indicators Control Indicator Indication 1 Power Ready Indicates that the power is ON and the self test has passed successfully The unit is ready to operate once the LED illuminates 2 Talk Indicates that the GP485 is addressed as a GPIB Talker 3 Listen Indicates that the GP485 is addressed as a GPIB Listener 4 SRQ Indicates that the GP485 signal line SRQ is asserted 5 AC ON OFF Turns AC power On and Off 11 4 2 2 Rear Panel TO VIDEAT Fig 4 2 Rear Panel Connections Table 4 2 Rear Panel Connections Connector Description Par 1 RS485 OUT EIA 568A shielded type connector used for 5485 3 9 3 10 communication with Zup power supplies re Shielded 24 pin Champ female connector with metric 3 8 3 11 screwlock Used for GPIB communication with the GPIB controller 3 AC Input IEC type appliance inlet 3 2 3 12 4 2 3 Top panel Switches 8 through 4 set the GPIB address of the GP485 The serial device address is the GP485 GPIB address plus 1 refer also to par 4 8 Before setting the address switches find two consecutive addresses that are not used by any other GPIB devices in the system In Figure 4 2 switches 8 to 4 are ON OFF ON OFF and OFF respectively indicating that the GP485 is at GPIB address 5 and the serial device is at GPIB address 6 GPIB ADDRESS
35. tener stops reading when it detects a data byte accompanied by regardless ofthe value ofthe byte EOS character The Talker transmits an EOS end of string character at the end of it s data string The Listener stops receiving data when it detects the EOS character Either a 7 bit ASCII character ora full 8 bit binary byte can be used When the GP485 receives it s own talk or listen address no EOS modes in effect When talking the GP485 asserts EOI with the last byte of it s response When the GP485 receives the serial device talk address the EOS modes in effect are those that the user selects using the eos function 4 10 SERIAL PORT TRANSMISSION The GP485 checks the data received from the serial device for errors while it buffers data If a serial port error occurs The GP485 records the appropriate error code There are two ways to determine if a serial port error has occurred Use the stat function to request the GP485 status information After the serial error code has been reported itis automatically cleared and no further action to the GP485 is necessary Serial poll the GP485 and check the serial poll response byte to see if it s SERR bit is set Refer to Par 4 12 later in this chapter Program the GP485 to ignore serial port errors using the spign function 4 11 OPERATION OF THE GP485 AS A GPIB DEVICE The GP485 operates like any other GPIB device and as such is configured to respond in certain ways t
36. us is RD 25 6 MAINTENANCE 6 1 INTRODUCTION This chapter contains maintenance information for the GP485 model 6 2 UNITS UNDER WARRANTY Units requiring repair during the warranty period should be returned to a Nemic Lambda authorized service facility Refer to the address listing on the back cover of this user s manual Unauthorized repairs performed by other than authorized service facilities may void the warranty 6 3 PERIODIC MAINTENANCE No routine maintenance of the GP485 is required except for periodic cleaning To clean disconnect the unit from the AC supply and allow 30sec for discharging internal voltage The front panel and the metal surfaces should be cleaned using a dry cloth Use low pressure compressed air to blow dust from the unit 6 4 ADJUSTMENT AND CALIBRATION No internal adjustment or calibration are required Units that are returned for service will be calibrated atthe service facility There is NO REASON to open the GP485 cover 6 5 PART REPLACEMENT AND REPAIRS As repairs are made only by the manufacturer of authorized service facilities no part replacement information will be discussed here In case of failure unusual or erratic operation of the unit contact a Nemic Lambda sales or service facility nearest you Please refer to the Nemic Lambda sales offices listed on the back cover of this user s manual 6 6 FUSE RATINGS Littelfuse Inc type 215 se
37. vel appliances portable equipment etc With smaller transient over voltages than Installation Category over voltage category Ill GROUNDING This product is a Safety Class 1 instrument To minimize shock hazard the instrument chassis must be connected to an electrical ground The instrument must be connected to the AC power supply mains through a three conductor power cable with the ground wire firmly connected to an electrical ground safety ground atthe power outlet For instruments designed to be hard wired to the supply mains the protective earth terminal must be connected to the safety electrical ground before an other connection is made Any interruption of the protective ground conductor or disconnection of the protective earth terminal will cause a potential shock hazard that might cause personal injury FUSES Fuse must be changed by authorized Nemic Lambda service personnel only For continued protection against risk of fire replace only with the same type and rating of fuse Refer to maintenance instructions in chapter 6 for fuse rating INPUT RATINGS Do not use AC supply which exceeds the input voltage and frequency rating of this instrument The input voltage and frequency rating of the GP485 is 100 240V 50 60Hz For safety reasons the mains supply voltage fluctuations should not exceed 10 of nominal voltage LIVE CIRCUITS Operating personnel must not remove the instrument cover No internal adjustment or c
38. y group General functions GPIB functions onl eos stat srqen Serial port functions echo spset spign 20 5 2 3 Alphabetical function list Table 5 4 separates the function in alphabetical order Table 5 4 Alphabetical function list echo on off Echo characters received from serial port eos modes eoschar Change or disable GPIB end of string termination mode onl on off Place the GP485 serial port online offline spign on off Ignore serial port errors spset modes Change serial port parameters srqen mask Set conditions for asserting SRQ stat options Return GP485 status modes Change serial port Xon Xoff protocol 5 3 COMMAND FUNCTION SYNTAX Table 5 5 functions syntax echo bool lt CR gt Use in a debugging environment when a terminal is connected to the GP485 instead of serial device Data that the GP485 would send to the power supply is displayed on the terminal screen User can also write characters on the terminal to send to the GP485 bool 0 echo off 1 echo on call echo without argument returns it s current status echo is disabled by default echo remains in effect until echo called again call onl or turn off the GP485 Example 1 WRT echo 1 CHR 13 Enable character CALL IBWRT GP485 WRT echoing 2 WRT echo CHR 13 What is the current status CALL IBWRT GP485 WRT RESP contains 1 lt CR gt
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