Summary of Contents for Caen ELS PreDAC
- Page 1 PreDAC PREcision multi-channel Digital to Analog Converter User’s Manual All Rights Reserved © CAEN ELS s.r.l.
- Page 2 Rev. 1.2 – October 2014 This product is certified. CAEN ELS s.r.l. Via Vetraia, 11 55049 Viareggio (LU) – Italy Mail: info@caenels.com Web: www.caenels.com...
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Page 4: Table Of Contents
NTERLOCK AND GENERAL CONNECTOR ..............42 THERNET AND CONNECTOR ................43 UTPUT CONNECTORS TECHNICAL SPECIFICATIONS ..............44 MECHANICAL DIMENSIONS ............... 46 PREDAC POWER SUPPLY ................47 PS1112 L ............47 INEAR OWER UPPLY PS1112 ................48 AT A LANCE I/O C .................. - Page 5 PreDAC User’s Manual 7.3.1 AC Line Input Connector ................. 48 7.3.2 AC Line Voltage Select Switch ..............49 7.3.3 Output Connectors ................... 50 7.3.4 Cabling ..................... 50 ................. 50 ECHNICAL PECIFICATIONS APPENDIX ......................51 ................51 IST OF THE RROR...
- Page 6 PreDAC User’s Manual Document Revision Date Comment February 14 2014 Document created April 10 2014 Images and description added July 25 2014 AC/DC part modified October 29 2014 Manual graphics changed April 16 2018 MAX/MIN commands, updated error codes...
- Page 7 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.
- Page 8 PreDAC User’s Manual Read over the instruction manual carefully before using the instrument. The PreDAC following precautions should be strictly observed before using the device: Do not use this product in any manner not WARNING 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.
- Page 9 PreDAC User’s Manual The following table shows the general environmental requirements for a correct operation of the instrument: Environmental Conditions Requirements Operating Temperature 0°C to 45°C Operating Humidity 30% to 85% RH (non-condensing) Storage Temperature -10°C to 60°C Storage Humidity...
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Page 10: Introduction
1.1 The - Digital to Analog Converter 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. -
Page 11: The Predac At A Glance
PreDAC User’s Manual 1.2 The PreDAC at a Glance The PreDAC unit and its I/O connections can be easily seen in Figure (front) and in Figure (rear). ON, CL and STATUS LEDs Output Channels Figure 1: front view of a PreDAC unit... - Page 12 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).
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Page 13: Features
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... -
Page 14: Dithering
PreDAC User’s Manual 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 V). The noise introduced by the dithering process is suppressed with active filtering. -
Page 15: 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. - Page 16 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’...
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Page 17: Voltage Output Commands
“.” is decimal delimiter; “YYYYYY” for decimal places. If more decimal places than the PreDAC resolution are sent to the unit, the value is 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 is described in the section 2.3.10 RES Command. - Page 18 PreDAC User’s Manual Examples: SET output voltage to 2.123456 V on all channels example: SET:ALL:+2.123456\r\n ACK\r\n SET read on channel 2 example: SET:CHN2:?\r\n SET:CH2:-11.123456\r\n SET zero voltage on channel 3 example: SET:CH3:OFF\r\n ACK\r\n...
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Page 19: Trg Command
(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. - Page 20 PreDAC User’s Manual SET:CH1:+2.123456\r\n ACK\r\n SET:CH3:+4.563578\r\n ACK\r\n (pause) Trigger/Gate pin signal (positive edge event ) Output voltage on the output BNC connector is updated. (pause) TRG:OFF\r\n ACK\r\n...
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Page 21: Gate Command
“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”. - Page 22 PreDAC User’s Manual Output voltage on the output BNC connector is updated immediately (pause) Trigger/Gate pin signal (negative edge event ) SET:CH1:+2.123456\r\n ACK\r\n Output voltage on the output BNC connector is NOT updated GATE:OFF\r\n ACK\r\n...
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Page 23: Configuration Commands
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... - Page 24 (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 –...
- Page 25 PreDAC User’s Manual Example: STATUS read example: STATUS:?\r\n STATUS:0181\r\n STATUS reset example: STATUS:RESET\r\n ACK\r\n...
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Page 26: Max Command
PreDAC User’s Manual 2.3.2 MAX Command The maximum output voltage of the PreDAC unit can be set through the command “MAX:channel:value\r\n”. To apply the command to all the PreDAC outputs, channel string should be “ALL”. If the value falls into the accepted range (smaller than +12V) the unit replies with “ACK\r\n”, otherwise replies with... -
Page 27: Interlock Command
PreDAC User’s Manual 2.3.4 INTERLOCK Command The PreDAC unit is provided with an external interlock connector that may be connected to an externally generated signal, which can be used to trigger the external interlock fault. The command to enable or disable the external interlock input is the following: “INTERLOCK:mode\r\n”, where mode could be “OFF”... -
Page 28: Temp Command
PreDAC User’s Manual 2.3.5 TEMP command TEMP Command (“TEMP:?\r\n”) allows user to read temperature from the internal temperature sensor. Temperature value is 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. -
Page 29: Ver Command
PreDAC User’s Manual 2.3.6 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: is a string indicating the device - i.e. “PREDAC”;... -
Page 30: Hwreset Command
PreDAC User’s Manual 2.3.7 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. -
Page 31: Id Command
PreDAC User’s Manual 2.3.8 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 memory as an ASCII string. -
Page 32: Idset Command
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 – i.e. 32 characters. -
Page 33: Res Command
16 (16-bit setting) or of 21 (21-bit setting). Replies from the PreDAC unit are in the form “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). -
Page 34: Command Table Summary
PreDAC User’s Manual 2.4 Command Table Summary Command Purposes Parameters Enable gate output voltage update GATE Disable gate output voltage update Perform a hardware and firmware reset HWRESET Query identification name IDSET Set identification name module_id Enable external interlock input... -
Page 35: Ethernet Communication
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. -
Page 36: Caenels Device Manager
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... - Page 37 PreDAC User’s Manual 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”...
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Page 38: Device Configuration
PreDAC User’s Manual If you have a firewall enabled on your router or on your computer, please make sure that the firewall is not preventing communication between your computer 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. -
Page 39: Firmware Upgrade
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 firmware update by clicking on the “Update device” button as shown . -
Page 40: I/O Connectors
PreDAC User’s Manual 4. I/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 1A. -
Page 41: Triggers Connector
PreDAC User’s Manual 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... -
Page 42: Ethernet And Sfp Connector
Ethernet communication see the Ethernet Communication section. The SFP 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... -
Page 43: Output Bnc Connectors
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. -
Page 44: Technical Specifications
PreDAC User’s Manual 5. Technical Specifications Main technical specifications for the PreDAC unit are shown in the following table: Characteristic Value Output Channels up to 4 (default is 2) Output Voltage Range ±12 V Output Voltage Resolution 21 bits or 16 bits... - Page 45 PreDAC User’s Manual Firmware remote update Additional Features Ecternal interlock protections Input Voltage Supply (± 3%) +12 V Dimensions 195 x 173 x 45 Weight 850 g...
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Page 46: Mechanical Dimensions
PreDAC User’s Manual 6. Mechanical Dimensions The mechanical dimensions of the PreDAC unit, including connectors, are hereafter presented in Figure 13 Figure 13: PreDAC mechanical dimensions... -
Page 47: Predac Power Supply
PreDAC User’s Manual 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 PS1112 Linear Power Supply... -
Page 48: The Ps1112 At A Glance
PreDAC User’s Manual 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 AC Line Voltage FAN and Select Switch... -
Page 49: Ac Line Voltage Select Switch
PreDAC User’s Manual 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. -
Page 50: Output Connectors
PreDAC User’s Manual 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 is connected to its ground (refer to... -
Page 51: Appendix
8. 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 is followed by a two digit “error code” field, which indicates the error cause and/or type. The list of the... - Page 52 Wrong MAX command MAX Command parameter setting (see Given parameter is not allowed MIN command Wrong MIN command MIN Command parameter setting (see PreDAC is controlled by the BEST system and it PreDAC in slave mode cannot receive additional user commands...