PreDAC - User`s Manual
Contents
1. CAEN ELS d o o Rev 1 2 October 2014 He VU gt i co un VU X un re al om oO X lt CAEN ELS 4 0 0 Kra ka ulica 2 6210 Se ana Slovenija Mail info caenels com Web www caenels com PreDAC User s Manual Table Of Contents 1 INTRODUCTIO N cca 9 1 1 THE PREDAC DIGITAL TO ANALOG CONVERTER 9 1 2 THE PREDAC AT A GLANCE cccececccceccececcsceccscecescscucescecescecescecesescusescecesees 10 1 3 FEATURES cccsceccccecccceccecececcecccececcececeececescecscscesescscescssescecescscesescusescecesees 12 1 4 ORE ET CARNE RB TON iaia 12 1 5 DITHERING AR serene SII e I II 13 SOFTWARE COMMANDS ifl orecereiizaececcccceceseecseceseeeneceeeeeeeceseeenececeeeeeeeeeese 14 2 1 COMMAND SYNTAX ifli vci recco re oee sie re encens 14 2 2 VOLTAGE OUTP aana 16 2 2 1 SET Cona L 16 2 22 TRG omun n Re RR o a IS 2 2 3 aA COMIC eo 20 2 3 CONFIGURATION COMMAND ne 22 2 3 1 STATUS Command re iii 22 2 5 2 INTERLOEK Command c cccccccccccecececececececccucnccce aseccscscecstscsssresseseheccs 25 D 0 02 STI RIRE 26 I ommani mmmm ER 27 2 3 5 HWRESET Command ccccccececcccccccecececececdeccecccccuccccccsneeaececececscscncecs 28 eee Onn I 8 3 29 ET Command vcecerereririnierevevevevesiciorererererceceveo ea 30 PRI Command cvercrcecerevevivicierevevevevesiciarerererercccecice Ira2. ACK r n or NAK r n this non acknowledgment reply is generated when the resolution selection is not a valid one not 16 nor 21 The command RES 7 n can be used to read the actual set output resolution The generated reply to this command has the next form RES resolution r n where resolution could be 21 default if the resolution is set to 21 bits or 16 if the resolution is set to 16 bits Examples RES example with an incorrect value RES 20 V n NAK n RES example with the valid parameter setting RES 2 An ACK r n 31 Software commands 2 4 Command Table Summary Command GATE HWRESET ID IDSET INTERLOCK RES SET STATUS VER TEMP TRG Purposes Enable gate output voltage update Disable gate output voltage update Perform a hardware and firmware reset Query identification name Set identification name Enable external interlock input Disable external interlock input Query interlock setting Set output voltage resolution Query resolution setting Set output voltage on the channel y Set zero output voltage on the channel y Query set voltage on the channel y Set output voltage on all channels Set zero output voltage on all channels Query device status Reset status fault conditions Query the device firmware version Read the devices internal temperature Enable triggered output voltage update Disable triggered output voltage update PreDAC User
3. a valid command r n is the termination sequence of the reply e Not AcKnowledge NAK indicates that the command is either not valid or that it was not accepted by the device the NAK reply is followed by an error code field which can be used to determine the cause of the error see the List of the Error Codes appendix for a detailed list of all possible error codes NAK nn r n NAK is the Not AcKnowledged response to an invalid command is the parameter s separation character nn 1s a the number of the error code r n is the termination sequence of the reply The list of commands used by the PreDAC and the corresponding syntax 1s hereafter presented as well as a description of each command purpose and any special requirements related to the specific command The commands are hereafter described and are grouped in categories based on their purpose e 2l lt 4 mhl8ttt__ amp Software commands PreDAC User s Manual 2 2 Voltage Output Commands The Voltage Output commands used in order to set output voltage on one or all channels of the PreDAC device are described in the following section 2 2 1 SET Command The PreDAC output voltage canbe set by the means of SET command Output voltage can be set separately for each channel or on all channels at one time The correct format for the SET command 1s as follows SET channel value nn where channel is the channel
4. and the PreDAC device The CAENels Device manager uses UDP port 30719 to find the device so make sure that the UDP traffic is allowed in both directions on that specific port 3 2 2 Device Configuration It is possible to change the Network configuration of the found devices In order to set the Network configuration it 1s necessary to select the desired device and to click on the Change device configuration button in the main window as shown in Figure 6 The configurable Network options are Device IP address TCP IP communication port Subnet mask VV VV Gateway To apply the changes on the device configuration it is necessary to edit the corresponding fields and then to click on the Save button A screenshot of a sample device configuration is shown in the following picture CAENels Device Manager v 1 0 ag Update device Property 4 Pi Beamline instru Valy essi MAC address New IP address Tetramm Mew port 13001 New subnet mask 255 255 255 0 192 168 010 192 168 1 1 01000000 9 Hardware timestamp 12 09 2015 16 08 10 Firmware wersion 0 9 7 7 D e vi CEC onfi gur at I on 11 MAC address 00 12 5e 11 01 02 Figure 6 Change device configuration Aa or PreDAC User s Manual Ethernet Communication 3 2 3 Firmware Upgrade The CAENels Device manager software also allows remotely updating the firmware of the PreDAC devices Once the desired device is found it is possible to perform the
5. by the user using the AC Line Voltage Select switch placed next to the VDE plug i e on the left side before connecting the power supply to the mains The fuse is housed over the VDE plug as indicated in Figure 16 0 TetrAMM User s Manual PreDAC Power Supply FUSE housing Figure 16 AC input and fuse housing 7 3 2 AC Line Voltage Select Switch The PS1112 linear power supply can be used either with a 115V 60Hz AC power line e g United States or with a 230 V 50 Hz AC Line e g Europe be sure to select the correct input voltage rating by switching the AC Line Voltage Select switch placed on one side of the box Possible switch positions one for each input voltage rating are shown in the following Figure 17 230V and 115V respectively AC Line Voltage Select switch for 230V operation AC Line Voltage Select switch for IISV operation Figure 17 AC line voltage select switch 47 7 3 3 Output Connectors The power supply has one locking output connector indicated as OUT The central pin corresponds to the positive power supply 12V respect to the external conductor that 1s connected to its ground refer to Figure 18 Positive power supply 12V Ground Figure 18 TetrAMM mechanical dimensions 7 3 4 Cabling The PS1112 linear power supply is equipped with a female to female locking power plug cable in order to handle connections to the CAENels TetrAMM dev
6. firmware update by clicking on the Update device button as shown Figure 7 The new opened window allows to select the new firmware file Flash file flash Once the flash file has been selected it is possible to start the firmware update by clicking the Update button The firmware update task will take a few minutes A screenshot of the update menu is shown hereafter CAENels Device Manager v 1 0 gt scam NE 4 Change device configuration dl ei CAENels devices a sp Network 192 168 0 1 IF address 4 r Beamline instr L Update device Se Tetr mm IP address 192 168 0 10 Port 10001 C TatrAMM_IV4_ firmware _v1 0 flash Hardware ID Hardware times 12 09 2013 16 08 Firmware version 0 9 7 7 Update device firmware MAC address 00 12 5e 11 01 02 Figure 7 Update device 37 1 0 Connectors PreDAC User s Manual 4 1 O Connectors This chapter describes the I O connectors present on the device front and rear panels their corresponding pinout and each signal functionality 4 1 Power Connector The input power connector is a standard male locking jack socket The input voltage is rated at 12V 3 with a maximum input current of 1 A The input ON OFF switch is placed above the input power connector which allows turning ON or OFF the device The used connector is shown in Figure 8 i OMOFF o switch 12 VDC 4 z Input locking power connector Figure
7. s Manual Parameters ON OFF z module id ON OFF pa resolution CHy value CHy OFF CHy ALL value ALL OFF RESET ON OFF 32 PreDAC User s Manual Ethernet Communication 3 Ethernet Communication The communication with the PreDAC unit is based on a 10 100 1000 Mbps Ethernet link The suggested connection speeds are 100 Mbps or 1 Gbps since the 10 Mbps connection represents a limit to the transmission data rate The factory network configuration and the CAENels Device Manager software are described in the following sections 3 1 IP Address Assignment The device is shipped with default IP address subnet mask gateway and TCP IP communication port Parameter Factory value IP address 192 168 0 10 Subnet mask 255 255 255 0 Gateway 192 168 0 1 TCP IP port 10001 Even if the PreDAC device can be connected to a LAN network a point to point Ethernet connection is strongly recommended in order to obtain minimum delay maximum data rate performance and to avoid possible communication problems i e increasing communication reliability This implies that the host PC and the PreDAC should reside on the same Ethernet subnet For a point to point connection it is not necessary to use a twisted cable because the used Ethernet link has an automatic detection of the communication direction 1 e auto sensing capability LOL Ethernet Communication PreDAC User s Manual To change the device networ
8. that can be placed next to the supplied device in order to reduce cable lengths and minimize consequent possible noise pick up Figure 14 PS1112 linear power supply 45 7 2 The PS1112 at a Glance The PS1112 is an isolated unipolar linear power supply with one output connector The PS1112 its input output indicators and switches are shown in Figure 15 AC Line Voltage z CAENels 4 FAN and Select Switch m e Mod 731112 LED monitor 115 230V sie e nti Led IE ns S MAX AC line i 12V utput input ke Figure 15 PS1112 connections The AC Power Line input and the AC Line Voltage selection switch 115 230V are placed on one side of the box the output connector the LED monitor and the air outlet on the other one The AC Power Line input is also equipped with an integrated two slot fuse holder one active and one as a replacement The PS1112 has an isolated output voltage of 12V rated at 1 2A maximum output current 7 3 I O Connectors This chapter describes the I O connectors and switches their corresponding pinout and their functionality 7 3 1 AC Line Input Connector The AC Line Input connector is in a standard VDE format and it is provided with a two slot fuse holder for over current e g short circuit protection The PS1112 power supply is designed for 115 230V input voltage and for 50 60 Hz input frequency operation the correct AC input voltage rating MUST be selected
9. this bit is set when the external interlock signal is enabled and the input interlock signal is high see Interlock and general I O connector section to reset the flag the it is necessary to execute a status reset see the following section The internal status register can be read with the STATUS r n command The reply from the PreDAC unit to this command is in the format STATUS value r n where value is the ASCII representation of the internal status register value composed by 4 hexadecimal digits corresponding to the 2 byte wide status register every byte is represented by two hexadecimal digits If at least one of the fault conditions occurs then the respective bit and the general fault bit are set simultaneously The output voltages are set to a zero voltage level in this conditions and it is not possible to enable them until the internal status register 1s reset The command to reset the fault condition of the status register is STATUS RESET r n the PreDAC unit replies to this command with an acknowledgment string G Software commands PreDAC User s Manual Example STATUS read example STATUS gt STATUS 0181 7 n STATUS reset example STATUS RESET n __ ACK r n 24 PreDAC User s Manual Software commands 2 3 2 INTERLOCK Command The PreDAC unit is provided with an external interlock connector that may be connected to an externally generated signal which c
10. 31 2 4 COMMAND TABLE SUMMARY cccscesccceccsceccsceccscecescscescscesencuseecnsesceseseeseces 32 ETHERNET COMMUNICATION cccccccccccccccccccccccccccccccccccccccscees 33 3 1 IRMANDIDRFSS ASSIGNMENT 00000000000000 li nnn 33 3 2 CABENELS DEVICE MANAGER scsscscoccsceccsceccscncsceceseecaseecsseecscescssesceseses 34 connected devices LS 34 LD Licio 36 3 DRG OP TRU PONT E E E a E ERE eee EST 37 OCR oc n co 38 4 1 POWER CONS ec 38 4 2 TRIGGERS CONNECTOR 0ccccececcececcececcececcececeecssescscescececescecescecesescesescecesees 39 4 3 INTERLOCK AND GENERAL I O CONNECTOR cccccecccceccscecescecescececescecesces 39 4 4 ETHERNET AND SFP CONNEGEOREREEERE Mean nn 40 4 5 OUTPUT BNC CONNECTORG ccsccccececcececcececcscecescecscecsescsescesescecesceceseeceees 41 TECHNICAL SPECIFICATIONS u ccccccccccccscccccccccccccccccccccccccccces 42 MECHANICAL DIMENSTONS ccccccccccccccccccccccccccccccccccccccccccccccces 44 PREDAC POWER SUPPLY Ji 45 7 1 THE PS1112 LINEAR POWER SUPPLY cccccececcececcececcscecscecsescecescecesees 45 1 2 THE PS1112 AT A GLANCE sue cirie re rie re rie ce visiere riore sie ceri eci visiere zionene 46 7 3 I O CONNECTORS cccsceccececcececcecececcecscececcececeecscesesceseecscescecscscestscusescecesees 46 ll AC Line Input CORN CGO na 46 1 3 2 AG Line Voltage Select SVG aria patina nsi daria
11. 47 8 PreDAC User s Manual TD ODIO iaia eo CO E E E E E O E TA TECHNICAL SPECIFICATIONS iaia iii APPENDIX 8 1 LIST OF THE ERROR CODES c ccscececcececcceccecscecccececsecceccecsesceceesecsencacaeesees PreDAC User s Manual CI February 14 2014 1 0 April 10 2014 Images and description added July 25 2014 CD October 29 2014 Manual graphics changed PreDAC User s Manual Safety information Warnings CAEN ELS will repair or replace any product within the guarantee period 1f the Guarantor declares that the product is defective due to workmanship or materials and has not been caused by mishandling negligence on behalf of the User accident or any abnormal conditions or operations Please read carefully the manual before operating any part of the instrument ZNWARNING ZX Do NOT open the boxes CAEN ELS d o o declines all responsibility for damages or injuries caused by an improper use of the Modules due to negligence on behalf of the User It is strongly recommended to read thoroughly this User s Manual before any kind of operation CAEN ELS d o o reserves the right to change partially or entirely the contents of this Manual at any time and without giving any notice Disposal of the Product The product must never be dumped in the Municipal Waste Please check your local regulations for disposal of electronics products PreDAC User s Manual Read over the instruction manual c
12. 8 Power connector and switch Q9 PreDAC User s Manual I O Connectors 4 2 Triggers Connector The PreDAC device has two input and one output trigger signals on LEMO coaxial connectors These input output connectors are called Triggers and are placed on the rear panel of the device as shown in Figure 9 TRIGGERS Output trigger TOKO triggers 0 n vy A e amp Figure 9 Triggers connectors on rear panel Signal levels are TTL LVTTL and CMOS compatible The maximum rated output current is 24mA The JN 1 input is also called Trigger Gate signal and it is used to synchronize the update of output voltage of the device to an external event for more information please refer to TRG Command and GATE Command sections The IN 2 and OUT connectors are reserved for future uses 4 3 Interlocksand general I O connector The Interlocks and general I O connector that has the pinout configuration described in Figure 10 is present on the rear panel of the PreDAC unit Interlock not connected pins General purpose 1 0 Reserved pins pins Figure 10 Interlock and I O connector 39 1 0 Connectors PreDAC User s Manual The pin functions are summarized in the next table Pin Function 1 2 Reserved pins 3 4 not connected 5 8 General purpose I O pins 9 10 External interlock pins The External interlock pins pins 9 10 can be used to detect an external signal th
13. BNC connector is NOT updated i GATE G 21 Software commands PreDAC User s Manual 2 3 Configuration Commands The commands that can be used to set or to read the PreDAC device configuration are described in this section 2 3 1 STATUS Command The internal status register of the PreDAC is a monitor of the status of the unit This register is composed of 2 bytes i e 16 bits where each byte cointains a specific type of information please note that bit 15 is the MSB and bit 0 is the LSB Status Register Structure Byte 1 Byte 0 bits 15 8 bits 7 0 CONFIGURATION byte FAULTS byte The structure of the CONFIGURATION byte bits 15 8 of the status register 1s hereafter presented Bit Cell caption 5 PreDAC in Slave mode 14 External interlock status 0 disabled 1 enabled 13 TRIGGER mode 0 disabled 1 enabled 12 GATE mode 0 disabled 1 enabled 11 Channel 4 status 0 OFF 1 ON 10 Channel 3 status 0 OFF 1 ON 9 Channel 2 status 0 OFF 1 ON 8 Channel 1 status 0 OFF 1 ON The structure of the FAULTS byte bits 7 0 is as follows Bit ff Cell caption i General fault logical OR of all faults 6 2 do not care l Over temperature fault latch of an over temperature event 0 External interlock fault latch of an interlock event PreDAC User s Manual Software commands A brief description of the binary flags in t
14. FP slot allows connecting a copper or optic platform to the internal digital system with a fixed speed of 1 Gbps and it is reserved for the integration of the PreDAC into the BEST Best Enhanced Stabilization Technology system for the photon beam optimization and stabilization 4 5 Output BNC connectors The up to four with a default configuration of two BNC connectors Bayonet Neill Concelman on the front panel of the PreDAC unit are used to supply the output voltages The BNC connectors are miniature quick connect disconnect RF connectors mainly used for coaxial cables Channel incremental numbering as can be seen in Figure 12 is right to left OUTI is the one on the right side while OUT4 is the one on the left OUT4 OUT3 OUT2 OUT1 Figure 12 output BNC connectors default 2 channel configuration The PreDAC unit has to be placed next to the piezo power driver e g ower amplifier in order to reduce cable lengths and thus cable capacitance and to minimize consequent noise pick up 41 Technical Specifications PreDAC User s Manual 5 Technical Specifications Main technical specifications for the PreDAC unit are shown in the following table Characteristic Output Channels Output Voltage Range Output Voltage Resolution Output Voltage Polarity Analog Bandwidth BW Output Voltage Accuracy Output Voltage Noise Output Impedance Maximum Output Current Rise and Fall time 10 90 Update rate Communica
15. PreDAC is working in conjunction with the BEST system in the closed loop for beam stabilization A blue STATUS LEDy which is used to signal the correct operation of the PreDAC device is also visible from the front panel During normal operation of the PreDAC unit the STATUS LED is blinking with a frequency of 0 5Hz 1 e the LED changes its status every 2 seconds if a fault condition arises the LED blinks with a higher frequency of 2 Hz the led changes its status every 0 5 seconds During the boot phase of the PreDAC unit which takes about 12 seconds after a power cycle or hardware reset all LEDs are turned on The power connector power switch two LEDs LEMO connectors for I O triggers interlock and general J O connector a standard RJ45 Ethernet connector and an SFP connector are placed on the rear panel of the device The blue CFG LED indicates that the on board FPGA is correctly configured in this case the LED is turned on The green DC OK LED indicates that the internal sections are correctly powered on The three coaxial LEMO connectors for I O triggers are also placed on the rear panel Please note that only the IN 1 signal is enabled and can be used for a synchronized voltage output see the Triggers Connector section The other two connectors i e IN 2 and OUT are reserved for future use The Interlocks and general I O connector has the pinout configuration shown in Figure 3 Pin 1 Pin 10 Figu
16. RG Command is that the start stop of the acquisition is not triggered by the rising edge of Trigger Gate signal but it is linked to the Trigger Gate signal level When the PreDAC unit is set to gate mode it starts to update the output voltage according to the SET commands The updating of the output voltage is stopped at the falling edge of Trigger Gate This mode acts as a set enabling signal A GATE ON r n string needs to be sent to the PreDAC in order to set it to gate mode When the command is received the unit replies with an acknowledgement string ACK r n The command that allows to disable the gate mode is GATE OFF r n default To read the actual Gate mode status it is possible to use the GATE AMM command The generated reply to this command has the format of GATE ON n when the gate mode is enabled and of GATE 0FF n when the gate mode is disabled Example GATE example GATE ONYAn R ACK xn pause SET CH1 2123456vV ACK r n Output voltage on the output BNC connector is NOT updated pause Trigger Gate pin signal U FEE positive edge event SET CH1 2 123456 n ACK r n a oa PreDAC User s Manual Software commands Output voltage on the output BNC connector is updated immediately pause Trigger Gate pin signal E negative edge event SET CH1 2 123456 x ACK n Output voltage on the output
17. al 2 22 TRG Command The TRG Command enables to synchronize the PreDAC output voltage setting to an external event via the hardware Trigger Gate signal refer to the Triggers Connector section This feature is extremely useful when the digital to analog converter must be synchronized to an external event e g an experimental time window or a machine specific frequency In the normal mode the execution of the SET command reflects in the immediate change of the output voltage value In the trigger mode on the other hand the execution of the SET command does not get into operation immediately The output voltage value which 1s set with the SET commands 1s saved into memory on a temporary register when the external signal occurs it forces the change of the output voltage setting The trigger mode operation is hereafter described As soon as the TRG ON r n command is received the PreDAC unit replies with an acknowledgement string ACK r n and enters the trigger mode When entering this mode the unit waits for a rising edge positive edge on the corresponding Trigger Gate input signal As soon as this event is detected by the PreDAC unit the internal logic transfers the output voltage value from the temporary register to the output register which results in the output voltage update on the BNC output connectors This behavior is kept until the trigger mode is disabled with the TRG OFF r n default command Please
18. an be used to trigger the external interlock fault The command to enable or disable the external interlock input is the following INTERLOCK mode n where mode could be OFF default to disable the interlock input or ON to enable it The unit replies to this kind of command with an acknowledgement string ACK r n In order to read the actual set interlock status it is possible to use the INTERLOCK rw query command The generated reply to this command has the format INTERLOCK mode r n where mode could be OFF if the interlock input is disabled default ON if interlock input is enabled Example INTERLOCK set example INTERLOCK ON r 1 ACK xn INTERLOCK read example INTERLOCK Nan gt INTERLOCK ONYAW 25 Software commands PreDAC User s Manual 2 3 3 TEMP command TEMP Command TEMP n allows user to read temperature from the internal temperature sensor Temperature value 1s updated every 10 seconds If temperature rises over the threshold of 50 C the over temperature fault trips and the output voltages are set to 0 V level After a fault event occurs it is necessary to reset the internal status register in order to be able to reactivate voltage outputs The reply to the TEMP command is in the format TEMP value n where value is the integer temperature readback value in C Example TEMP read example TEMP XAn gt TEMP 23 n Pr
19. and intensity Io of the photon beam in synchrotron radiation X ray beamlines The PreDAC communication to a host PC is guaranteed by a standard 10 100 1000 Mbps Ethernet TCP IP protocol while its integration in the BEST Beamline Enhanced Stabilization Technology system is performed via the SFP link present on the rear panel OL Introduction PreDAC User s Manual 1 2 The PreDAC ata Glance The PreDAC unit and its I O connections can be easily seen in Figure 1 front and in Figure 2 rear s ON CL and STATUS LEDs Output Channels Figure 1 front view of a Pre DAC unit Power Switch Power connector Trigger Power and Connectors Configuration Interlocks and LEDs general _ n input output Reset thernet and connector button communication interfaces Figure 2 rear view of a PreDAC unit Q9 PreDAC User s Manual Introduction There are up to four BNC connectors for outputting the analog voltages and various status LEDs placed on the front panel of the PreDAC unit The total number of BNC connectors depends on the configuration of the PreDAC unit default two channels The two white LEDs on the front panel the left one is the ON LED and it is turned on when at least one of the output channels is feeding the voltage to its corresponding connector The other white LED is marked with CL Closed Loop and can be found on the rightmost side of the front panel When lit up is indicating that the
20. arameter fields depends on the specific command All commands are NOT case sensitive and therefore the command string can be sent either using uppercase or lowercase characters conversion to uppercase characters 1s performed internally Each instruction must be terminated with a carriage return line feed sequence r n or 0x0D Ox0A in hexadecimal notation or commonly CRLF PreDAC User s Manual Software commands Command Example RNG 1 r n RNG is the command field 1s the parameter s separation character J is the first parameter field Vi are the termination sequence of the command Commands are processed one at a time therefore user must wait for a response from the unit before sending the next command All the responses from the PreDAC device are in upper case and are terminated with the same carriage return line feed sequence r n 1 e CRLF used in the command The reply from the device depends on the given command for more information about the single command please refer to the specific command section There are two specific replies that are commonly used in many commands and that indicate that the command has been correctly elaborated or not These replies are hereafter presented e ACKnowledge ACK indicates that the command is valid and it was correctly elaborated by the device ACK r n ACK is the ACKnowledgement response to
21. arefully before using the instrument The following precautions should be strictly observed before using the PreDAC device Do not use this product in any manner not specified by the manufacturer The protective features of this product may be impaired if it is used in a manner not specified in this manual e Do not use the device if it 1s damaged Before you use the device inspect the instrument for possible cracks or breaks before each use e Do not operate the device around explosives gas vapor or dust e Always use the device with the cables provided e Turn off the device before establishing any connection e Do not operate the device with the cover removed or loosened e Do not install substitute parts or perform any unauthorized modification to the product e Return the product to the manufacturer for service and repair to ensure that safety features are maintained CAUTION e This instrument is designed for indoor use and in area with low condensation PreDAC User s Manual The following table shows the general environmental requirements for a correct operation of the instrument Environmental Conditions Operating Temperature Operating Humidity Storage Temperature Storage Humidity Requirements 0 C to 45 C 30 to 85 RH non condensing 10 C to 60 C 5 to 90 RH non condensing PreDAC User s Manual Introduction 1 Introduction This chapter describes the general characteristies and ma
22. at can be used to trigger the external interlock fault and to switch off the High Voltage module see INTERLOCK Command and STATUS Command Commands sections for more information The interlock pins are galvanically isolated from ground The maximum voltage that can be applied to the interlock terminals 1s rated at 24V the minimum signal that guarantees the tripping of this interlock is rated at 3V the maximum reverse voltage that this interlock can sustain is rated at 5 5V The General purpose 1 0 pins pins 5 8 are connected to the internal digital section and they are reserved for future system updates The not connected pins pins 3 4 are not present or if present they are not connected to the internal digital system The Reserved pins pins 1 2 are connected to the internal digital section and are reserved for internal use so they must NOT be connected 4 4 Ethernet and SFP connector On the rear side of the PreDAC unit there are also a RJ45 Ethernet connector and a small form factor pluggable SFP slot as indicated in Figure 11 RJ45 Ethernet connector SFP slot with cap Figure 11 Ethernet and SFP connections The RJ45 Ethernet slot is used to communicate with PreDAC unit The connector is linked to a true 10 100 1000 Mbps physical device For more information about the Ethernet communication see the Ethernet Communication section Aa or PreDAC User s Manual I O Connectors The S
23. ation 1 e a User Defined Calibration for example for nulling application specific offsets Q9 PreDAC User s Manual Introduction 1 5 Dithering Internal dither frequency for each channel is fixed to 100 kHz This enables to achieve 21 bits of resolution in the standard operation mode the minimum step size equals 12 uV The noise introduced by the dithering process is suppressed with active filtering The fourth order active filtering have 80 dB roll off so the dithering noise is extensively damped In addition to this standard operation mode it is also possible to have the output voltage without the use of the dithering the output voltage resolution is reduced to 16 bits minimum step size equals 366 uV even if the dithering noise is not present 13 Software commands PreDAC User s Manual 2 Software commands This chapter describes the software commands used for the correct configuration of the PreDAC Digital to Analog Converter and for its data readout For more information about the Ethernet settings see the Ethernet Communication chapter 2 1 Command Syntax The command structure and syntax used by the PreDAC protocol are described in the following sections Commands must be sent in ASCII format and are composed by e one command field e none one or two parameter field Please note that these fields are separated by a colon or Ox3A in hexadecimal notation The number of p
24. device is working correctly even if it is not recommended to use a slow connection since the data transfer rate 1s limited a oa PreDAC User s Manual Ethernet Communication Link LED Figure 4 Ethernet Link connect the PreDAC to the AC DC power supply unit and switch it on install and launch the CAENels Device manager software perform a scan to discover the connected PreDAC devices by clicking the Scan button as indicated in Figure 5 If there are multiple available networks it is possible to select the network networks to be scanned in the Selected network interfaces window available under the Options menu All the information about the selected devices is shown in the right side of the main window Scan selected network interfaces CAENels Device Manage Vv Change device configuration w Update device IP address 4 e CAENels devices sp Network 192 168 0 1 Beamline instru Ple TetrAmm i TetrAmm Serial number 13001 IP address 192 168 0 10 Found device Port 10001 Subnet mask 255 255 255 0 i Gateway 192 168 1 1 Device information Hardware ID 01000000 Hardware timestamp 12 09 2015 16 08 Firmware version 0 9 7 7 MAC address OTA 5e1 1 01 02 Figure 5 Main interface 35 Ethernet Communication PreDAC User s Manual If you have a firewall enabled on your router or on your computer please make sure that the firewall 1s not preventing communication between your computer
25. eDAC User s Manual Software commands 2 3 4 VER Command The VER r n command returns information about the PreDAC unit and the currently installed firmware version The reply to the VER r n command is in following format VER model ver channels r n where model is a string indicating the device 1 e PREDAC ver cointains the string corresponding to the installed firmware version channels isa string indicating the number of installed channels 1 e DACs Example VER example VER Aas gt VER PREDAC 0 9 81 3CHN n The PREDAC device of the previous example has the 0 9 81 firmware version installed and it has a 3 output channels 21 Software commands PreDAC User s Manual 2 3 5 HWRESET Command The HWRESET r n command performs a complete reset of the hardware and firmware on the on board FPGA thus re initializing the entire PreDAC module control electronics The unit replies with an acknowledgment string ACK r n before resetting the module Example HWRESET example HWRESETV 28 PreDAC User s Manual Software commands 2 3 6 ID Command The ID r n command returns the pre assigned PreDAC identification name as a string The reply from the PreDAC contains the value stored in the module EEPROM and it assumes the following format ID module_id r n where module id is the module identification name stored in non volatile mem
26. he internal status register of the PreDAC 1s hereafter presented PreDAC in Slave mode bit 15 this bit is set when PreDAC is controlled by the BEST system External interlock enabled bit 14 this bit 1s set when the external interlock input is enabled see INTERLOCK Command section Trigger mode enabled bit 13 this bit is set when the trigger mode is enabled see TRG Command section Gate mode enabled bit 12 this bit is set when the gate mode is enabled see GATE Command section Channel Status bits 11 6 these bits indicate if the corresponding output channel is active or it is disabled it s output voltage is set to 0 V General fault bit 7 this bit is set if the module has experienced a fault e g generated by an external interlock or an internal protection trip like internal over temperature This bit is a logical OR of all other fault flags and it is latching 1 e when a fault occurs this bitas set together with the specific fault bit When a fault is detected the module switches off all output channels A status reset of the device is necessary in order to reset the module see the following section Over temperature fault bit 1 this bit is also latching and it is set when the internal PreDAC temperature rises above the 50 C threshold to reset this flag it is necessary to execute a status reset command see following section External interlock fault bit 0
27. ice The standard cable length is 1 5m 60 7 4 Technical Specifications Main technical Specifications for the PS1112 linear power supplies are presented in the following table Characteristic Value Output Voltage 12 V Maximum Output Power 14 4 W Maximum Output Current 1 2 A AC Line Voltage Input 115V 230 V AC Line Frequency 50 60 Hz Dimensions 115 x 95 x 57 mm Weight 850 g Indicators 1 LED OUT OK Cooling Forced air convection integrated Fuse F500 mA 48 TetrAMM User s Manual Appendix 5 Appendix 8 1 List of the Error Codes The PreDAC unit replies with a Not AcKnowledge NAK if the received command is not correct or it is not accepted This NAK reply 1s followed by a two digit error code field which indicates the error cause and or type The list of the possible error codes is hereafter presented Error Code 00 10 11 12 13 14 15 16 49 Error name Invalid command Wrong SET command channel parameter Wrong SET command value parameter Wrong TRG command parameter Wrong GATE command parameter Wrong USRCORR field parameter Wrong USRCORR value parameter Wrong STATUS command parameter Brief description of error Command field is not valid the list of valid commands is shown in the Command Table Summary section Given parameter is not allowed SET command channel setting see SET Command Given parameter is not allowed SET command
28. in features of the PreDAC Multi channel Digital to Analog Converter 1 1 The PreDAC Digital to Analog Converter The PreDAC Multi channel Digital to Analog Converter by CAEN ELS is a up to 4 channel 21 bit resolution wide bandwidth Digital to Analog Converter DAC which is especially designed for operation with the BEST Beamline Enhanced Stabilization Technology system The core of the PreDAC system 1s formed of high speed 16 bit digital to analog converter that uses dithering technique and active low pass filtering to obtain stable high accuracy 21 bit output signal This device is capable of outputing 12 V bipolar voltage with resolution of 12 uV 1 e 21 bits of resolution on the bipolar output range Output voltage noise is suppressed using a 4 order active low pass filter with cut off frequency 3 dB of 10 kHz Low temperature drifts good linearity and very low noise levels enable users to perform high precision voltage signal generation The PreDAC is typically fitted with two output channels but can be optionally upgraded to have three or even four output channels It is housed in a light robust and extremely compact metallic box that can be placed as close as possible to the actuator power driver in order to reduce cable lengths and minimize possible noise pick up It is specially suited for applications where multi channel simultaneous actuations are required a typical application being the control of position X Y
29. k setup it is necessary to use the CAENels Device Manager software that can be downloaded from the CAENEels website www caenels com A briefly description of this software is given in next section 3 2 CAENels Device manager The software CAENels Device manager can be used to search for all the PreDAC devices connected to the local network and to configure them This software also allows to set the network configuration of the found devices and to update their firmware The CAENels Device manager is available for Windows and Linux platform and the system requirements hereafter listed e Windows minimum system requirements gt Windows XP or newer gt Intel or equivalent processor gt 70 MB available HD space gt Ethernet network card y 4 Linux minimum system requirements gt Linux kernel 2 2 x or newer gt Intel or equivalent processor gt 70 MB available HD space gt Ethernet network card 3 2 1 Searching for connected devices Please follow the next steps in order to search for the PreDAC devices connected to the local network connect the host PC and the PreDAC directly with an Ethernet cable or through a network verify that the Link LED on the RJ45 connector is turned on amber for a 1 Gbps connection as shown in Figure 4 or green for a 100 Mbps connection The LED is turned off if the Ethernet cable is not connected or if the speed of connection is limited to 10 Mbps in this last case the
30. note that an acknowledgment string is sent back to the host after a TRG ON r n or TRG OFF r n command is received User can set different output voltages on various channels with different SET commands corresponding to voltage setting on each channel and then update them simultaneously as soon as the external trigger pulse is received see the example below Each subsequent write to the channel temporary register overwrites the previous value so only the last written and stored value is fed to the output register and thus to the output connector To read the actual trigger mode status it is possible to use the command TRG r n The generated reply to this command has the next form TRG ON n when the trigger mode is enabled or ITRG OFF n when the trigger mode is disabled Example TRG example TRG ON W 1 R i ACK r n pause a S oa PreDAC User s Manual Software commands SET CHL 2 123456V n ACK Vr SET CH3 4 563578 n ACK Vr pause Trigger Gate pin signal positive edge event Output volt gt BNC ce Software commands PreDAC User s Manual 2 2 3 GATE Command The GATE Command is similar to the TRG Command see the TRG Command chapter This command also allows to synchronize the output voltage update with an external event using the signal on the Trigger Gate input connector see Triggers Connector chapter the difference respect to the T
31. number or all value is the voltage output value in V The channel parameter can be chosen between these values CHI for the channel 1 CH2 for the channel 2 CH3 for the channel 3 CHA4 for the channel 4 ALL for the concurrent write of the same value to all channels The value parameter is defined as the output voltage to be set in V The value field is concatenated from the following subfields XX YYYYYY ce 99 field for the number sign or XX for the tens and units of the value 1s decimal delimiter YYYYYY for decimal places If more decimal places than the PreDAC resolution are sent to the unit the value 1s rounded to the closest actable one and additional places are discarded The resolution of the output voltage can be set with the RES command which 1s described in the section 2 3 8 RES Command The value field can also have two other values OFF to set zero voltage on the selected channel channels 2 for the readback of the set voltage on the selected channel channels 0 PreDAC User s Manual Software commands Examples SET output voltage to 2 123456 V on all channels example SET ALL 2 123456 n P ACK n SET read on channel 2 example SET CHN2 Mn gt SET CH2 11 123456VAn SET zero voltage o SET CH3 0F Software commands PreDAC User s Manu
32. ory as an ASCII string The ID command being a reading command returns a response in any module condition Examples ID example with the module identification Actuator ID An ID ACTUATORI n 29 Software commands PreDAC User s Manual 2 3 7 IDSET Command Users can write a desired identification name in the module EEPROM with the IDSET command This name can be read using the ID command described previously in this document The correct format for this command is as follows IDSET module id rn where module id is the ASCII content to be written to the EEPROM Replies from the PreDAC are in the form ACK r n or NAK r n this non acknowledgment reply is generated when the module id string length is greater than 32 bytes 1 e 32 characters Examples IDSET example the new identification name is Actuator IDSET Actuator1 r n ACK r n 0 PreDAC User s Manual Software commands 2 3 8 RES Command The RES command is used to change the resolution of the output voltage which can be of 21 bits high resolution or of 16 bits standard If resolution is set to 21 bits then dithering is enabled while is disabled when the resolution 1s set to 16 bits The correct form format for this command is as follows RES resolbtion r n where resolution can be a value of 16 16 bit setting or of 21 21 bit setting Replies from the PreDAC unit are in the form
33. re 3 Interlock and general I O connector 11 Introduction PreDAC User s Manual Pin Function 1 2 Reserved 3 4 Not present 5 8 General purpose I O 9 10 External interlock The external interlock pins can be used to detect an external event which can be used to trigger the external interlock fault and to switch the present voltage outputs to a zero level see Interlock and general I O connector section for more information Please note that these interlock pins are galvanically isolated from ground The General purpose I O pins are not yet used and they are reserved for future use on the device On the rear panel of the PreDAC there is a small hole that gives access to a reset button RST which can be used to reset the unit Next to the reset button are placed a RJ45 Ethernet connector ETH which is used to communicate with the unit and a Small form factor pluggable transceiver SFP which will be used for future updates 1 3 Features A host PC is necessary in order to operate the PreDAC unit and properly set check the desired parameters e g output voltage Please refer to the Software commands chapter for a complete description of available commands their purposes and their syntax 1 4 Offset calibration The PreDAC device is already factory calibrated during the production process Gain and offsets are stored in the non volatile internal memory However user can perform an additional calibr
34. tion Extra Communication interface External Signals Fault condition Output connectors Value up to 4 default is 2 12 V 21 bits or 16 bits Bipolar 10 kHz 12 uV ppm FS 50 Q 10 mA 35 us Up to 100 ksamples s ch Ethernet 10 100 1000 TCP IP SFP Small form factor pluggable for BEST integration Configurable Trigger Gate External Interlock External interlock Internal over temperature BNC 42 PreDAC User s Manual Technical Specifications irmw Additional Features Input Voltage Supply 3 12 V Dimensions Weight 850 g 43 6 Mechanical Dimensions The mechanical dimensions of the PreDAC unit including connectors are hereafter presented in Figure 13 Figure 13 PreDAC mechanical dimensions TetrAMM User s Manual PreDAC Power Supply 7 PreDAC Power Supply This chapter describes the general characteristics and the main features of the TetrAMM linear power supply called PS1112 This power supply is particularly designed for operation with the CAENels TetrAMM picoammeter 7 1 The PSH Linear Power Supply CAENels PS1112 is a single output 12V linear power supply designed for low noise operation and it is especially suited for low power measurement system where switching power supplies could corrupt measuring accuracy precision and noise The power supply is housed in a light robust and compact plastic box refer to Figure 14Error Reference source not found
35. value setting see SET Command Given parameter is not allowed TRG command setting see TRG Command Given parameter is not allowed GATE command setting see GATE Command Given parameter is not allowed USRCORR command field setting see Error Reference source ot found Given parameter is not allowed USRCORR command parameter setting see Error Reference ource not found Given parameter is not allowed STATUS command setting see STATUS Command 17 13 19 20 21 22 50 Wrong INTERLOCK command parameter Wrong TEMP command parameter Wrong VER command parameter Wrong ID command parameter Wrong IDSET command parameter Wrong RES command parameter PreDAC in slave mode Given parameter is not allowed INTERLOCK command setting see INTERLOCK Command Given parameter is not allowed TEMP command setting see TEMP command Given parameter is not allowed VER command setting see VER Command Given parameter is not allowed ID command setting see ID Command Given parameter is too long see IDSET Command Given parameter is not allowed RES command setting see RES Command PreDAC is controlled by the BEST system and it cannot receive additional user commands 50
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