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User Manual - Schulz Electronic GmbH

1. 3 CPUTEMP_OVERSTEPPED Read The PLCS has exceeded its permitted operating temperature of 80 C 4 Reserved Read Reserved 5 DEVICETEMP_WARN Read The temperature of the connected pulser is approaching the switch off temperature 6 DEVICETEMP_OVERSTEPPED Read The switch off temperature of the connected pulser has been reached 7 DEVICETEMP_HYSTERESIS Read The connected pulser is currently in the cooling phase 8 DEVICETEMP_SENSORFAILED Read The temperature sensor in the pulser is defective 9 DEVICE_FAILED Read The connected pulser is defective 10 NODEVICE Read No connected pulser was detected 11 CALERROR Read An error occurred during calibration 12 TBL_FAIL Read No data was found for the connected pulser a software update is necessary 13 Reserved Read Reserved 14 Reserved Read Reserved 15 U_15V_FAIL Read The supply voltage is too low 16 INTERNAL_ERROR Read An internal error occurred Please contact support 17 FAULTY_ID Read The connected pulser has an invalid ID 18 Reserved Read Reserved 31 If a critical error occurs pulser emissions stop automatically All error situations must be acknowledged or reset with CLRERROR Otherwise the PLCS cannot restart pulse output 26 Pic LAS FOCUSSING POWER TO THE POINT Example Implementation in MS Visual Basic The following is a possible implementation of the protocol for uni directional communications in MS Visual Basic No guarantee of functionality is ass
2. Pic LAS POWER TO U S e n Rev 09 01 valid from June 2009 PLCS 21 PicoLAS GmbH Company for Innovative Power Electronics und Laser Technology KaiserstraBe 100 52134 Herzogenrath Tel 449 0 2407 563 58 0 Fax 49 0 2407 563 58 29 E Mail infoGpicolas de Web www picolas de 5 FOCUSSING POWER THE POINT Table of Contents dua A MCI 3 Description of Connections eene nene enn enn tn nn 4 Howto get started cic ee dete tang eet inei 5 Operating MOES eisint 6 Using the PLCS 21 as a Control Unit for a Laser Diode 6 Using the PLCS 21 as a Digital Function Generator 222 7 meinte E 7 Tigger MOOS scence 8 Controlling the PLCS 21 Using a 21 5 45 nre tn edet ete ipfe tid nete 10 Controlling the PELCS ZT via USB eu notis redet pec Le dee aie 13 Electrical 31 Absolute Maximum 05 1 1 2 211 42 2 00 000000000 31 PLCS 21 Pic LAS FOCUSSING POWER TO THE POINT Rev 09 01 valid from April 2009 Providing Brains for pulsed Driver Modules Product Description Many PicoLAS driver mo
3. 500 Us 15V 0 5 V con 4 High Level input Voltage 5 Usz15V 0 9 3 5 4 7 V con 4 Absolute Maximum Ratings Parameter see figures Symbol Ambient operating temperature 09 to 55 C Supply voltage Us 0 3V to 15 5V Trigger voltage on connector 5 Ur so 6V to 6V Trigger voltage on connector 4 6V to 6V Load current on connector 3 1 170mA 31
4. individual bits further on in the document GETDEVICENAME Instructs the recipient to send back a string which contains the name of the connected pulser If O is sent as parameter the answer contains the number of digits of the string otherwise the respective position of the name is sent in ASCII format 22 PICeLAS FOCUSSING POWER TO THE POINT SETVOL Changes the target specification of the set voltage The parameter is standardized to 0 4095 and can be calculated from a value in mV using the conversion factor GETVOLPERSTEP Only the range which is defined by GETVOLMIN and GETVOLMAX is permissible Outside of this range the sender will receive a ILGLPARAM as answer The answer parameter is the set target value SETLSTAT Changes the laser status register to the passed parameter The return value contains the changed status register SETREPRATE Changes the repeat rate of the pulses to the passed value Only the range which is defined by GETREPRATEMIN and GETREPRATEMAX is permissible Outside of this range the sender will receive a ILGLPARAM as answer The answer parameter is the set repeat rate SETPULSEWIDTH Changes the width of the pulse to the passed value Only the range which is defined by GETPULSEWIDTHMIN and GETPULSEWIDTHMAX is permissible Outside of this range the sender will receive a ILGLPARAM as answer The answer parameter is the set pulse width SETSHOTS Changes the number of pulses to be emitted to the passed va
5. PicoLAS protocol e init followed by Enter for the text interface If the PLB 21 and the USB interface are both connected at the same time then only the USB interface can be used As soon as the USB connection is connected to a computer then the PLCS switches automatically over to this Description of the USB Interface The USB connection of the PLCS 21 emulates a virtual COM port under Windows The necessary drivers can be downloaded free of charge under http Awww ftdichip com Drivers VCP htm or they are already included in the current Linux kernels The virtual COM port created by this can be addressed like a regular one The connection settings are Baud rate 115200 Data bits 8 Stop bits 1 Parity even 13 Pic LAS FOCUSSING POWER TO THE POINT The Serial Text Interface The following section describes the structure and commands of the text interface Structure Every command that is sent to the PLCS 21 must be completed with a CR Enter It consists of a command word followed by a parameter If the command was successfully executed then an 0 is sent otherwise a 1 If the command requires an answer parameter this parameter is sent before the confirmation is given Example The user would like to read out the voltage currently being used by the pulser User input gvoltage lt Enter gt Output of the PLCS 21 12000 0 Input is done in ASCII code and is case sensitive Ever
6. can either be generated on the rising or the falling edge of the supplied trigger On each edge which equates the given setting a given number of pulses Shots will be generated Pulse In this mode an external trigger source is required to generate pulses The PLCS will generate pulses during the positive or negative part of the trigger source Internal In this mode the external trigger source is ignored The PLCS will generate an infinite number of pulses by itself Connector 4 Connector 5 R Us 500 Ra 500 Figure 3 Trigger input circuit Pic LAS FOCUSSING POWER TO THE POINT External Trigger IL TUUL 1 _ Pulse Negative Mo IL LIL LL ease nsno sese rating Figure 4 Shematic voltage diagram Pic LAS FOCUSSING POWER TO THE POINT Controlling the PLCS 21 Using a PLB 21 To control the PLCS 21 with a PLB 21 it must be connected via the enclosed cable The PLB 21 will not work if both the USB and the PLB 21 are connected the same time When the PLB 21 is connected the first time to a PLCS 21 you are asked to download a new driver This must be confirmed with yes for the PLB 21 to work properly Menu Structure The following diagram shows the structure of the PLB 21 menu which affects the PLCS 21 All entrys are described in detail All other menu entries are described in the PLB 21 manual For detailed instructions see the PLB 21 manual M
7. 05 Refer to description SETVOL 0x0030 0 4095 0x0053 0 4095 SETLSTAT 0x0031 0 27 1 0 0054 0 27 1 SETREPRATE 0x0032 0 27 1 100057 SETPULSEWIDTH 00033 0 27 1 0 0056 0 27 1 SETSHOTS 0 0034 0 27 1 0x0058 122274 SETOVERCUR 0 0035 0 4095 0x0052 0 4095 SETDEVTEMPOFF 0 0036 16 bit short 0 0050 16 bit short SETUMIN 0 0038 0 4095 0x0053 0 4095 CLEARERROR 0x0039 0 0x005A 0 EXECCAL 0x003A 0 0 0058 Refer to text RSTDEF 0 003 0 0 0060 0 20 5 FOCUSSING POWER THE POINT Description of the Individual Commands GETCPUTEMP Contains as return value the current temperature of the PLCS 21 in The two low bytes of the answer parameter represent a signed short GETDEVTEMP Contains as return value the current temperature in of the pulser connected to the PLCS 21 If no pulser is connected then the value is 0 GETVOLMIN Contains as return value the minimum voltage that can be set for the connected pulser The range that can be set is divided into 4096 steps If voltage is required in mV then a conversion factor can be requested using the command GETVOLPERSTEP If no pulser is connected then the value is 0 GETVOLMAX Contains as return value the maximum voltage that can be set for the connected pulser The range that can be set is divided into 4096 steps If voltage is required in mV then a conversion factor can be requested using the command GETVOLPERST
8. EP If no pulser is connected then the value is 0 GETVOLSET Contains as return value the current voltage specification for the connected pulser The range that can be set is divided into 4096 steps If voltage is required in mV then a conversion factor can be requested using the command GETVOLPERSTEP If no pulser is connected then the value is O GETVOLACT Contains as return value the measured value of the target voltage of the connected pulser The range that can be set is divided into 4096 steps If voltage is required in mV then a conversion factor can be requested using the command GETVOLPERSTEP If no pulser is connected then the value is O GETVOLPERSTEP Contains as return value a conversion factor with which the value range of 0 4095 can be converted to mV The answer is a 64 bit double data word If no pulser is connected then the value is 0 GETCURVAL Contains as return value the presently set current in mA This value is only valid if the PLCS 21 is in Current Mode and an up to date calibration is available If no pulser is connected or if the PLCS is not in Current Mode the value is O GETLSTAT Contains as return value the laser status register There is a description of the individual bits further on in the document GETDEVID Contains as return value the ID of the connected pulser GETPULSEWIDTH Contains as return value the currently set pulse width in ns GETPULSEWIDTHMIN Contains as return value the minimu
9. If the diode driver reaches this temperature during operation the laser will be disabled and an error message is displayed It can be modified within the boundaries defined in the device specific datasheet Dev Max This is shows the maximum operating temperature of the connected diode driver It also defines the maximum value for the shutdown tamerature Dev Act This displays the current temperature of the diode driver PLCS Act This shows the current temperature of the PLCS 21 It should not exceed 80 C LDP Info Config This submenu holds some information and configuration options of the connected laser diode driver Name This shows the name of the connected laser diode driver Reset to def This forces the PLCS 21 to reset all parameters to factory defaults All settings and calibration data are lost 12 Pic LAS FOCUSSING POWER TO THE POINT Controlling the PLCS 21 via USB Introduction In addition to being able to connect up a PLB 21 the PLCS 21 also has a USB interface to communicate with a computer laptop This interface allows communications over both a serial text interface as well as using the PicoLAS protocol While the text interface is designed for communication with a terminal program the PicoLAS protocol is designed as a system interact protocol The switching between the two protocols occurs automatically as soon as the PLCS 21 receives a certain sequence The corresponding commands are e for the
10. It must be above the threshold voltage of the connected laser diode Otherwise the calibration will fail In the modes Voltage or Freq gen this setting has no effect Calibration When selected a press on the Enter key will perform a calibration See chapter Calibration for a detailed description 11 Pic LAS FOCUSSING POWER TO THE POINT Trigger The PLCS 21 supports a number of trigger modes For a detailed description of each mode see chapter Trigger modes Mode This selects the used trigger mode The modes are equal for all operation modes and connected drivers Available are edge internal and pulse Logic This option is only used when the trigger mode is either edge or pulse In edge mode you can select if pulses should be generated on the rising or falling edge of the supplied trigger In pulse mode it selects weather pulses should be generated on positive high or the negative low part of the trigger signal Shots When using the edge mode the number of generated pulses can be determined by the user The given number of pulses will always be generated even if another trigger is received during generation Temperature The PicoLAS laser diode drivers are equipped with a temperature sensor In this submenu the minimum maximum current and shutdown temperatures can be read and modified All values are in C Dev Off This shows the user defined shutdown temperature
11. LAS which makes use of this protocol The explanation of the individual commands is given further below Command Name Sent Frame Answer Frame Command Parameter Command Parameter PING OxFEO1 0 OxFFO1 0 IDENT OxFEO2 0 OxFF02 ID GETHARDVER OxFEO6 0 OxFFO6 Version GETSOFTVER OxFEO7 0 OxFF07 Version GETSERIAL OxFEO8 0 255 OxFFO8 Refer to description GETIDSTRING OxFEO9 0 255 OxFFO9 Refer to description GETDEVICECHECKSUM OxFEOA 0 OxFFOA CRC16 checksum RESET OxFEOE 0 OxFFOB 0 PING Is used to determine the presence of a connected recipient and to initialize the interface of the recipient for this protocol Has no effect on the condition of the recipient The command parameter is always 0 the answer parameter too IDENT It is used to determine the device ID of an attached recipient Has no effect on the condition of the recipient The parameter is always The answer contains the ID GETHARDVER Instructs the recipient to send back the version number of the hardware being used The parameter is always 0 The answer contains the hardware version of the recipient The format of the answer is 0x000000 lt major gt lt minor gt lt revision gt In other words one byte for each of the three elements of the version number As example version 1 2 3 has the parameter 0x000000010203 GETSOFTVER Instructs the recipient to send back the version number of the software being used The paramet
12. and 8 for the control interfaces Using the PLCS 21 as a Control Unit for a Laser Diode Driver First the PLCS 21 must be mounted on the laser diode driver by using the two connectors on its bottom side and three screws M3 x 8mm PLCS 21 and the diode driver are both powered by a single 15 V power supply via connector 1 Then a PLB 21 or a PC with appropriate software must be connected to the PLCS 21 Now the PLCS 21 is ready for use Important Connector 3 must never be connected to any cable if the PLCS 21 is mounted on a diode driver Anything else can result in deformed laser pulses Though monitored by the PLCS 21 the power being fed into a laser diode may exceed the adjusted value and can in some cases destroy your diode Correct operation is guaranteed only if connector 3 is left unconnected Furthermore the connected diode driver must use its internal high voltage source See device specific datasheet for instructions how to enable the internal HV source Voltage Mode This mode is active by default once a pulser is connected to the PLCS 21 The pulse width repetition rate voltage temperature monitor and over current detection of the connected pulser can be set In Voltage Mode it is also possible to carry out a calibration See chapter Calibration for details When it is done a change to Current Mode can be carried out Current Mode When calibration is successfully completed a change to Current Mode can be carried out No
13. as the precharge voltage is automatically modified to match the set point current Voltage This value defines the precharge voltage of the connected pulser The actual current depends on the connected pulser and diode The maximum voltage depends on the connected pulser If the set point voltage generates a current flow greater than the maximum current defined by Imax the laser will be disabled and an error message is displayed PLCS Config In this submenu you can change the operation mode of the PLCS 21 the maximum pulse current and the minimum voltage for calibration Furthermore you can execute a calibration Mode The available operation modes depend on your hardware configuration If you use the PLCS 21 as a stand alone device without a connected laser diode driver it can only be used as a frequency generator Freq gen otherwise Voltage and or Current are possible Before you can select Current you must perform a calibration See chapter Operation modes and Calibration for more information Imax This value defines the maximum current output of the connected driver If the given settings generate a higher current the laser diode is automatically disabled This requires no calibration If a calibration is performed this value defines the maximum current for it When the PLCS 21 is used as a frequency generator Imax has no effect Umin This value defines the starting voltage for the calibration process
14. cted since the last start 15 31 Reserved Read Reserved 24 PICeLAS FOCUSSING POWER TO THE POINT The following table contains the appropriate LSTAT bits for the trigger modes described in chapter Trigger Modes Mode 15 Bits Description Bit5 Bit4 Bit3 Bit2 0 0 0 0 External trigger falling edge Number of pulses can be set 1 0 0 0 1 External trigger rising edge Number of pulses can be set 2 0 0 1 0 Internal trigger ongoing pulses 3 0 0 1 1 Internal trigger ongoing pulses 4 0 1 0 O External trigger pulse output during LOW level on the trigger input 5 0 1 0 1 External trigger pulse output during a HIGH level on the trigger input 25 Pic LAS FOCUSSING POWER TO THE POINT Description of the ERROR Register The following list contains a description of the individual bits of the ERROR register A 1 as a bit leads to a deactivation of the pulser output Bit 5 and 10 are excluded of this directive They must be acknowledged with CLRERROR before pulse output can take place again If the bits 9 12 or 15 occur then the voltage supply must be briefly disconnected to delete the bits Bit Name Read Write Meaning 0 IMAX_OVERSTEPPED Read The PLCS measured a pulse current larger than the set value and has switched off 1 VOLTAGE_FAIL Read Reserved 2 Reserved Read Reserved
15. dules for pulsed lasers can be upgraded with the PLCS 21 optional piggyback controller This versatile funtion generator allows full control of pulse width pulse current and repetition rate Priority is given to provide maximum safety for the expensive laser diodes An on board micro controller monitors current voltage temperature pulse duration and rep rates and cuts power to the diode if necessary The PLCS 21 provides a galvanically isolated USB interface With this the upgraded driver module can be connected to a PC An additional interface can be used to connect the external operating unit PLB 21 This allows easy monitoring and manipulating the driver s behavior The piggyback controller also provides several internal trigger mechanism This eliminates the need for an external function generator as a trigger device The PLCS 21 can also work as a standalone digital function generator A square wave signal with pulse width from 2 ns up to one second can be drawn from a coaxial 50 Ohm output The PLCS 21 automatically identifies the connected driver module Maximum pulsewidth output power etc depend on the used laser diode driver e Control of pulse current pulse width and repetition rate e Microcontroller supervision of all pulser activity e Provides USB interface for communication with PC and interface for PLB 21 e Several additional failsafe mechanisms to protect your laserdiodes e Standalone Pulse Genera
16. ead gt 12 Or Timeout 0 If Timeout 0 Then If Serial BytesToRead 12 Then If Receive buffer Then RecAnswer buffer 0 RecAnswer Convert ToUIntl6 buffer 1 lt lt 8 RecParameter buffer 2 RecParameter Convert ToUInt64 buffer 3 lt lt 8 RecParameter Convert ToUInt64 buffer 4 lt lt 16 RecParameter Convert ToUInt64 buffer 5 lt lt 24 RecParameter Convert ToUInt64 buffer 6 lt lt 32 RecParameter Convert ToUInt64 buffer 7 lt lt 40 RecParameter Convert ToUInt64 buffer 8 lt lt 48 RecParameter Convert ToUInt64 buffer 9 lt lt 56 IamBusy False Return RecAnswer expectet_answer End If End If End If Next IamBusy False Return False End Function Private Function Send ByVal command As UShort ByVal param As UInt64 As Boolean Dim buffer 12 As Byte 29 5 FOCUSSING POWER TO THE POINT buffer 0 command And amp HFF buffer 1 command gt gt 8 And amp HFF buffer 2 param And amp HFF buffer 3 param gt gt 8 And amp HFF buffer 4 param gt gt 16 And amp HFF buffer 5 param 24 And amp HFF buffer 6 param gt gt 32 And amp HFF buffer 7 param gt gt 40 And amp HFF buffer 8 param gt gt 48 And amp HFF buffer 9 param gt gt 56 And amp HFF buffer 10 0 buffer 11 C
17. ed LED On Error Blinking Calibration in progress The connectors on the bottom side of the device allow connecting the PLCS 21 to a PicoLAS laser diode driver they must not be used for any other purpose Pic LAS FOCUSSING POWER TO THE POINT How to get started Step What to do Note 1 Unpack your Device 2 Optional Connect your Scope to the current monitor of your diode driver as the mounted PLCS 21 covers the SMC jacket 3 Mount the PLCS 21 to your PicoLAS laser diode driver e g LDP V 50 100 V3 4 Connect the power supply See Figure details 5 Connect the PLCS 21 either to the PLB 21 or a PC via USB See Figure details 6 Optional Connect trigger source See Figure details 7 9 When the initializing is done adjust the pulse parameters to your needs See Controlling the PLCS 21 using the PLB 21 USB and the device specific manual for details 9 Activate the output Pic LAS FOCUSSING POWER TO THE POINT Operating Modes The PLCS 21 can be operated in two different ways As a controller for a compatible PicoLAS diode driver and as a stand alone digital function generator If used as a controller it supports the Voltagemode and the Currentmode otherwise the Frequency Generator mode In either mode a number of trigger modes and thee different control interfaces are supported See chapter 6 for a detailed description of the trigger modes and chapters 7
18. enu root Pulseparameter o Width o o Current o Voltage PLCS Config o Mode o Imax o Umin o Calibrate Trigger o Mode o Logic o Shots Temperature o Dev Off o Dev Max o Dev Act o PLCS Act LDP Info Config o Name o Reset to def Pulseparameter In this menu point you can modify the pulse length repetition rate current and voltage of the pulse The minimum and maximum values for every entry depend on your hardware configuration The PLCS 21 automatically detects the connected laser diode driver and sets the values according to it See the device specific datasheet for detailed information 10 Pic LAS FOCUSSING POWER TO THE POINT Width This value defines the pulse width in nano seconds ns The minimum and maximum values are defined by the connected pulser and by the actual repetition rate In order to generate the absolute maximum width the user may need to reduce the repetition rate Reprate This value defines the repetition rate in Hertz Hz The actual minimum and maximum values depend on the connected pulser an on the given pulse width In order to generate the absolute maximum repetition rate the user may need to reduce the pulse width Current The current is only used in current mode After a successfully performed calibration the user can set up a current which flows through the connected diode during the pulse Note that the voltage changes according to the given current
19. er is always 0 The answer contains the software version of the recipient The format of the answer is 0x000000 lt major gt lt minor gt lt revision gt In other words one byte for each of the three elements of the version number As example version 2 3 4 has the parameter 0 000000020304 GETSERIAL Instructs the recipient to send back its serial number If 0 is sent as parameter the answer contains the number of ASCII digits of the serial number otherwise the respective position of the serial number is sent in ASCII format GETIDSTRING Instructs the recipient to send back the name of the device If 0 is sent as parameter the answer contains the number of digits of the string otherwise the respective position of the serial number is sent in ASCII format 18 5 FOCUSSING POWER THE POINT GETDEVICECHECKSUM Instructs the recipient to transmit a CRC16 checksum of its memory This can be used to check the integrity of the programme memory after switching on RESET Instructs the recipient to carry out a software reset This resets the device to the switch on state The parameter is always 0 Commands for the PLCS 21 The following table contains a list of the commands which the PLCS 21 supports in addition to the generally applicable commands An explanation of the individual commands follows afterwards Command Sent F
20. heckByte buffer WriteByte buffer End Function Private Function Receive ByVal buffer As Byte As Boolean For i As UInteger 0 To 11 Step 1 buffer i ReadByte Next If buffer 11 CheckByte buffer Then Return True End Lf Return False End Function Private Function CheckByte ByVal buffer As Byte As Byte Dim returnvalue As Byte 0 For i As UInteger 0 To 10 Step 1 returnvalue returnvalue buffer i Next Return returnvalue End Function Private Sub WriteByte ByVal zeichen As Byte Serial Write zeichen 0 12 End Sub Private Function ReadByte As Byte Return Serial ReadByte End Function End Class Using this example code a connection can be set up using the following lines of code Dim MyProto As Protocol New Protocol MyProto Enable Com3 MyProto SendReceive Protocol PING 0 Protocol ACK 30 PICeLAS FOCUSSING POWER TO THE POINT Electrical Characteristics Parameter Symbol Condition Min Typ Max Unit Supply current Us 15V no cable device 175 mA connected to PLCS 21 Load resistance con 3 10 50 Ohm Output voltage con 3 UL 50 Ohm 4 85 5 5 15 V Input resistance con 5 Rr 5o 48 50 52 Ohm Input resistance con 4 500 485 515 Ohm Low Level input Voltage Us 15V 0 5 V con 5 High Level input Voltage Ur so Us 15V 0 6 2 3 3 4 V con 5 Low Level input Voltage
21. ke the trigger inputs the output circuit is not galvanically isolated from the power supply To obtain a well formed signal a load of 50 Ohm is recommended Refer to the electrical characteristics on chapter Electrical Characteristics for further details Pulse Unit 50 Ohm Connector 3 4 connector on bottom side Figure 2 Pulse output circuit Calibration The PLCS 21 can calibrate itself to the characteristics of the connected laser diode If the calibration is successfully performed the user is able to switch into the current mode in which either the precharge voltage or the diode current can be adjusted In order to perform a calibration a valid maximum diode current must be set This value will be the maximum current for the given diode Note that a maximum of 9996 of this value will be reached during calibration in order to protect the diode Furthermore a valid minimum voltage Umin must be supplied Most times this will be slightly above the threshold voltage of the connected diode The user must assure that with this voltage the minimum load current of the connected diode driver is reached See the device specific datasheet for the actual minimum current If the minimum load current is not reached during the start of calibration an error message is displayed and the user needs to increase During the calibration the PLCS 21 generates a linear list of measuring points from which it analyses the relation of a gi
22. lowed by one reserved byte and one checksum byte The checksum is calculated out of the first 11 bytes which are linked by a bitwise XOR Thus a frame has the following structure Byte Meaning 1 Bit 8 15 of the command 2 Bit 0 7 of the command 3 Bit 56 63 of the parameter 4 Bit 48 55 of the parameter 5 Bit 40 47 of the parameter 6 Bit 32 39 of the parameter 7 Bit 24 31 of the parameter 8 Bit 16 23 of the parameter 9 Bit 8 15 of the parameter 10 Bit 0 7 of the parameter 11 Reserved always 0x00 12 Checksum A properly received frame must be acknowledged by the recipient with an answer which is also a frame If the acknowledgement does not occur then the command has not been processed and the sending procedure should be repeated If the recipient recognizes the command as valid but not the parameters then it will answer with a ILGLPARAM OxFF12 as command In the case that the recipient receives an invalid command it will answer with UNCOM OxFF13 If a faulty checksum is recognized then the answer is RXERROR 1 0 If this error occurs often then the connection should be checked Using the REPEAT OxFF11 command the recipient can instruct the sender to send the most recent frame again 17 Pic LAS FOCUSSING POWER TO THE POINT General Commands The following list contains an overview of the general commands which are supported by every product from Pico
23. lue This register is only used in the trigger modes 0 and 1 Only the range which is defined by GETSHOTSMIN and GETSHOTSMAX is permissible Outside of this range the sender will receive a ILGLPARAM as answer The answer parameter is the number of pulses to be emitted SETOVERCUR Changes the maximum permissible diode current to the passed value Only the range which is defined by GETOVERCURMIN and GETOVERCURMAX is permissible Outside of this range the sender will receive a ILGLPARAM as answer The answer parameter is the set maximum current SETDEVTEMPOFF Changes the switch off temperature to the passed value Only the range which is defined by GETDEVTEMPMIN and GETDEVTEMPMAX is permissible Outside of this range the sender will receive a ILGLPARAM as answer The answer parameter is the set maximum temperature SETUMIN Changes the set minimum voltage for the calibration to the passed value Only the range which is defined by GETVOLMIN and GETVOLMAX is permissible Outside of this range the sender will receive a ILGLPARAM as answer The answer parameter is the set minimum voltage CLEARERROR Deletes the ERROR register and resets the PLCS to an error free condition EXECCAL Instructs the pulser to carry out a calibration If the answer parameter is zero then a calibration is initiated by the PLCS 21 If it is unlike zero then it is currently not possible to carry out a calibration This occurs when the PLCS is currently carrying out a calibra
24. m settable pulse width in ns GETPULSEWIDTMAX Contains as return value the maximum settable pulse width in ns GETREPRATE Contains as return value the currently set repeat rate in Hz GETREPRATEMIN Contains as return value the minimum settable repeat rate in Hz 21 5 FOCUSSING POWER THE POINT GETREPRATEMAK Contains as return value the maximum settable repeat rate in Hz GETSHOTS Contains as return value the currently set number of pulses to be emitted This register is only used in the trigger modes 0 and 1 GETSHOTSMIN Contains as return value the minimum settable number of pulses to be emitted This register is only used in the trigger modes 0 and 1 GETSHOTSMAX Contains as return value the maximum settable number of pulses to be emitted This register is only used in the trigger modes 0 and 1 GETOVERCUR Contains as return value the presently set value for over current detection This is indicated in the range from 0 4095 If a value in mA is required then this can be queried with GETOVERCURVAL This register is only used if the PLCS 21 is not being used as frequency generator GETOVERCURMIN Contains as return value the minimum settable value for over current detection This is indicated in the range from 0 4095 This register is only used if the PLCS 21 is not being used as frequency generator GETOVERCURMAX Contains as return value the maximum settable value for over current detectio
25. n This is indicated in the range from 0 4095 This register is only used if the PLCS 21 is not being used as frequency generator GETOVERCURVAL Contains as return value the presently set value for over current detection in mA This register is only used if the PLCS 21 is not being used as frequency generator GETDEVTEMPOFF Contains as return value the presently set switch off temperature in for the pulser which is connected When this temperature is reached the pulser emissions are stopped and a temperature error is outputted This register is only used if the PLCS 21 is not being used as frequency generator GETDEVTEMPMIN Contains as return value the minimum settable switch off temperature in C This register is only used if the PLCS 21 is not being used as frequency generator GETDEVTEMPMAX Contains as return value the maximum settable switch off temperature in This register is only used if the PLCS 21 is not being used as frequency generator GETUMIN Contains as return value the presently set start voltage for the calibration It is standardized to 0 4095 precisely the same way as the voltages in the VOLTAGE commands and can be converted using the same factor If a pulser calibration is carried out it will begin with this value This register is only used if the PLCS 21 is not being used as frequency generator GETERROR Contains as return value the present content of the error register There is a description of the
26. nt in mA Outputs the minimum pulse current Only in Current Mode mode 2 gcurrentmax Current in mA Outputs the maximum pulse current Only in Current Mode mode 2 sshots Number of pulses Sets the number of pulses to be emitted to the indicated value Only in trigger mode 0 and 1 gshots Number of pulses Outputs the currently set number of pulses laseron Activates pulse output laseroff Deactivates pulse output strgmode Trigger mode Sets the trigger mode to be used refer to trigger modes gtrgmode Trigger mode Outputs the current trigger mode sistat 32 bit number Sets the LSTAT register to the value glstat 32 bit number Outputs the LSTAT register gerror 32 bit number Outputs the ERROR register clrerror Resets the ERROR register sumin Voltage in mV Sets the starting value for calibration gumin Voltage in mV Outputs the starting value for calibration socur Current in mA Sets the maximum current for over current detection gocur Current in mA Outputs the present value for over current switching 15 Pic LAS FOCUSSING POWER TO THE POINT Command Parameter Answer Description stempoff Temperature in C Changes the switch off temperature to the passed value gtempoff Temperature Outputs the current switch off temperature gtempoffmin Temperature in C Outpu
27. pen End Get Set ByVal Value As Integer End Set End Property Property Busy As Integer Get Return IamBusy End Get Set ByVal Value As Integer End Set End Property Public Function Enable ByVal port As String As Boolean 27 Pic LAS FOCUSSING POWER TO THE POINT If PortOpen Then Return True End If Try If Not port Then Comport port End Serial New IO Ports SerialPort Comport 115200 IO Ports Parity Even 8 IO Ports StopBits One Serial Open PortOpen True SendReceive Me PING 0 Me ACK SendReceive Me PING 0 Me ACK Catch ex As Exception PortOpen False Return False End Try Return True End Function Public Function Disable As Boolean If PortOpen Then Try Serial Close Catch ex As Exception End Try PortOpen False Serial Nothing Return True Eng TE Return False End Function Public Function SendReceive ByVal command As UShort UInt64 ByVal expectet_answer As UShort As Boolean Dim Timeout As UInt32 10000 Dim buffer 12 As Byte If Not PortOpen Then Return False End If 28 ByVa l param As Pic LAS FOCUSSING POWER TO THE POINT If IamBusy Then Do Application DoEvents Loop While IamBusy True EnA If IamBusy True For i As UInteger 0 To 4 Timeout 10000 Serial DiscardInBuffer Send command param Do Timeout 1 Application DoEvents Loop Until Serial BytesToR
28. rame Received Frame Command Parameter Command Parameter GETCPUTEMP 0x0001 0 0 0050 50 200 C GETDEVTEMP 0x0002 0 0 0050 50 200 C GETVOLMIN 0x0003 0 0 0053 0 4095 GETVOLMAX 0 0004 0 0 0053 0 4095 GETVOLSET 0 0005 0 0 0053 0 4095 GETVOLACT 0x0006 0 0x0053 0 4095 GETVOLPERSTEP 0x0007 0 0x0053 Refer to description GETCURVAL 0x0008 0 0x0052 277 1 MA GETLSTAT 0x0009 0 0 0054 0 2 1 GETDEVID 0x000A 0 0 0055 0 32 GETPULSEWIDTH 0x000B 0 0 0056 0 27 1 ns GETPULSEWIDTHMIN 0 000 0 0 0056 0 277 1 ns GETPULSEWIDTHAX 0x000D 0 0 0056 0 27 1 ns GETREPRATE 0 0x0057 0 27 1 Hz GETREPRATEMIN 0x000F 0 0x0057 O 27 1 Hz GETREPRATEMAK 0 0010 0 0x0057 0 27 1 Hz GETSHOTS 0 0011 0 0 0058 0 27 1 GETSHOTSMIN 0x0012 0 0 0058 0 27 1 GETSHOTSMAK 0 0013 0 0 0058 0 27 1 GETOVERCUR 0x0014 0 0 0052 0 4095 GETOVERCURMIN 0 0015 0 0 0052 0 4095 GETOVERCURMAX 0x0016 0 0 0052 0 4095 GETOVERCURVAL 0x0017 0 0x0052 0 27 1 32 bit mA GETDEVTEMPOFF 0x001B 0 0 0050 16 bit short GETDEVTEMPOFFMIN 0 001 0 0 0050 16 bit short GETDEVTEMPOFFMAX 0x001D 0 0x0050 16 bit short C GETUMIN 0x001E 0 0 0051 0 4095 19 Pic LAS FOCUSSING POWER TO THE POINT Command Sent Frame Received Frame Command Parameter Command Parameter GETERROR Ox001F 0 0x0059 GETDEVICENAME 0x0022 0 0 0
29. tion or if no pulser is connected RSTDEF Instructs the PLCS 21 to reset all parameters to factory defaults All calibration data will be lost The default values are the minimum values for the PLCS 21 or the connected laser diode driver 23 5 FOCUSSING POWER THE POINT Description of the LSTAT Register The following list contains a description of the individual LSTAT bits These can be read with GETLSTAT and written with SETLSTAT With SETLSTAT a complete 32 bit word must always be written Thus to change individual bits first the register must be read out with GETLSTAT then the desired bits changed and then with SETLSTAT passed again to the PLCS Bit Name Read Write Meaning 0 L ON Read write Switch on off the pulse output 1 MODE Read Operating mode 0 Normal 1 Frequency Generator 2 5 TRG MODE Read write Refer to trigger modes 6 ENABLE HELPPULSE Read write Reserved 7 EMABLE FEEDBACK MON Read write Reserved 8 VOLTAGEMODE Read write Switches between Voltage Mode and Current Mode 9 UNCAL Read write Indicates whether calibration data is available 10 CALIBRATING Read Indicates that a calibration is currently being carried out 11 Reserved Read Reserved 12 BUSY Read Indicates that the PLCS is currently not accepting commands 13 INIT COMPLETE Read Indicates successful initialization 14 DEVICE CHANGED Read Indicates that another device type has been conne
30. tor capability Technical Data Supply voltage Min Pulse width Max Pulse width Pulse width adjustment Min Repetition rate Max Repetition rate Repetition Rate adj Coaxial 50 Ohm output Trigger Inputs Interfaces Dimensions Weight Operating temperature 15 V supply voltage for LDP V is fed through PLCS 2 ns 1s in steps of 1ns 250ns in steps of 5ns gt 250ns 1Hz 2 4 Mhz in steps of 1 Hz Generator Voltage 10V Maximum Load 50 Ohm 50 Ohm 5V SMC connector 500 Ohm 5V 2 Pin connector USB 2 0 PLB 20 67 7 x 42 3 x 22 mm 26g 0 to 55 C Technical data is subject to change without further notice See manuals for details Optional Accessories PLB 21 Compatible Products LDP V 03 100 V3 LDP V 50 100 V3 LDP V 240 100 V3 LDP AV 06 20 5 FOCUSSING POWER THE POINT Description of Connections The following drawing shows all connections which are available to the user U GND Micro Switch Con Con oa Con Con Con Green LED Con Figure 1 Connectors of the PLCS 21 Connector 1 Supply Voltage Connector 2 Mini USB Connector Connector 3 SMC Connector 50 Ohm pulse output Connector 4 2 Pin Connector 500 Ohm trigger input Connector 5 SMC Connector 50 Ohm trigger input Connector 6 Connector for PLB 20 Micro Switch no function reserved for future use Green LED On Off PLCS 21 not operational R
31. ts the minimum switch off temperature gtempoffmax Temperature Outputs the maximum switch off temperature smode Mode Sets the operating mode passed value 0 Frequency Generator 1 Voltage Mode 2 Current Mode gmode 0 2 Outputs the current operating mode calibrate Carries out a calibration default Resets all parameters to factory defaults If an Error Occurs If an error occurs during operation the pulse output is switched off and a message is sent to the terminal Errors have to be acknowledged with clrerror otherwise switching on again of pulse output is not possible Note that warnings are also displayed this way but these do not switch off pulse output Hence it is not necessary to aknowledge warnings with clrerror This message has this format err Error Register The parameter Error Register represents the content of the ERROR register in binary form 16 PICeLAS FOCUSSING POWER TO THE POINT The PicoLAS Protocol The following section describes the structure and possible commands of the PicoLAS protocol Structure Each transmission consists of 12 bytes called a frame as follows which must be sent consecutively Otherwise the system times out and the transmission must start again from the beginning A frame has a fixed structure The first two bytes describe the command the following eight bytes the parameters fol
32. umed Public Class Protocol Public Const PING As UShort amp HFEO1 Public Const IDENT As UShort amp HFEO2 Public Const GETHARDVER As UShort 6 06 Public Const GETSOFTVER As UShort 6 07 Public Const GETSERIAL As UShort amp HFE08 Public Const GETIDSTRING As UShort amp HFEO9 Public Const GETDEVICECHECKSUM As UShort amp HFEOB Public Const RESET As UShort amp HFEOE Public Const As UShort amp HFFO01 Public Const IDACK UShort amp HFF02 Public Const VERSIONACK As UShort amp HFF03 Public Const HARDVERACK As UShort amp HFF06 Public Const SOFTVERACK As UShort amp HFF07 Public Const SERIALACK As UShort amp HFFO08 Public Const IDSTRINGACK As UShort amp HFF09 Public Const CHECKSUMACK As UShort amp HFFOA Public Const RESETACK As UShort amp HFFOB Public Const RXERROR As UShort amp HFF10 Public Const REPEAT As UShort amp HFF11 Public Const ILGLPARAM As UShort amp HFF12 Public Const UNCOM As UShort amp HFF13 Private RecParameter UInt64 0 Private RecAnswer As UInt64 0 Private Comport As String Private PortOpen As Boolean False Private Serial As IO Ports SerialPort Nothing Private IamBusy As Boolean False Public Function GetAnswer As UShort Return RecAnswer End Function Public Function GetParameter 01664 Return RecParameter End Function Property Status Get AS Integer Return PortO
33. ven voltage to the measured current If successfully performed it saves the collected data which is used to calculate a precharge voltage for a given current Now the user can not only set a precharge voltage but also a set point current Note that a calibration is only valid for a given hardware setting The PLCS 21 cannot detect any change in the connected laser diode So the user must recalibrate it every time the connected hardware is changed Pic LAS FOCUSSING POWER TO THE POINT Trigger Modes The PLCS 21 supports a number of trigger modes which are described below The width and repetition rate of the pulses generated are user defined Pulses will always be generated as long as the trigger condition matches and the laser is enabled As an input for the trigger signal the connector 4 or 5 can be used Figure 3 shows the schematic of both inputs Note that they are galvanically isolated from the supply voltage For trigger levels see the electrical characteristics on chapter Electrical Characteristics Important Never use both trigger inputs at the same time Correct operation is not ensured if both inputs are connected to a source Furthermore a signal fed into one input may result in a current flowing out of the other input This might damage your trigger source In the following the different trigger modes are described separately Edge In this mode an external trigger source is required to generate pulses The pulses
34. w in addition to voltage the current can alternatively be set These two parameters are linked together in such a way that a change to the set current always generates a change to the voltage The minimum value for the voltage is specified by Umin the maximum value for the current is specified by Imax The interdependency of both values is determined during calibration and is stored in the PLCS 21 If another diode is connected to the pulser or another pulser is connected to the PLCS 21 then the calibration must be manually repeated A change in the diode or the pulser with the same type cannot be detected by the PLCS 21 If the values of Umin or Imax change then this also means that a new calibration must be carried out in order to take the new limits into account Pic LAS FOCUSSING POWER TO THE POINT Using the PLCS 21 as a Digital Function Generator The PLCS 21 will automatically work in this mode if it is not connected to a laser diode driver Only the functions for setting the pulse width repeat rate trigger modes and activating deactivating of the output are active All others are not used and the corresponding LSTAT and ERROR bits can be ignored The generated signal can be received from connector 3 The schematic of output circuit is shown in figure 2 The output amplifier will generate a square wave signal with an amplitude of 10V If a 50 Ohm load is attached to connector 3 this will result in a signal level of 5V at the load Unli
35. y terminal can be used that supports this standard Commands for the PLCS 21 The following table contains a command reference for the PLCS 21 Command Parameter Answer Description help Help text Output of a help text spulse Pulse length in ns Sets the length of the pulse to be emitted gpulse Pulse length in ns Outputs the current pulse length gpulsemin Pulse length in ns Outputs the minimum pulse length gpulsemax Pulse length in ns Outputs the maximum pulse length sreprate Repeat rate in Hz Sets the repeat rate of the pulse greprate Repeat rate in Hz Outputs the current repeat rate grepratemin Repeat rate in Hz Outputs the minimum repeat rate grepratemax Repeat rate in Hz Outputs the maximum repeat rate svoltage Voltage in mV Sets the precharger voltage of the pulser gvoltage Voltage in mV Outputs the current precharger voltage of the pulser 14 PICeLAS FOCUSSING POWER TO THE POINT Command Parameter Answer Description gvoltagemin Voltage in mV Outputs the minimum precharger voltage of the pulser gvoltagemax Voltage in mV Outputs the maximum precharger voltage of the pulser scurrent Current in mA Sets the pulse current to the indicated value Only in Current Mode mode 2 gcurrent Current in mA Outputs the present pulse current Only in Current Mode mode 2 gcurrentmin Curre

User Manual - Schulz Electronic GmbH

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