AH401B Users Manual
Contents
1. 22 2 2 7 23 2 2 8 a aE 24 2 2 9 25 2 3 COMMANDS TABLE SUMMARY 0 enin 26 3 COMMUNICATION MODULES ccccccscsccccccccsssssssssccccsscesceseesccccccceees 27 3 1 MODULE HARDWARE INSTALLATION 000000 0 0 0 0 27 3 2 ETHERPIGGY MO U E alal 28 3 2 1 ETHERPiggy IP Address Assign 28 3 2 2 ETHERPiggy Software Configuration essen 31 4 555 35 4 1 POWER CONNECTOR ino 35 4 2 INTERFACE CONNECTOR ccccccccccccssssscecccccesessssssescccccessuususseeccecssesuneneess 35 4 2 1 The rale ici ie 36 4 2 2 The TRIGGER GATE SEONG 36 5 TECHNICAL SPECIFICATIONS slitte 37 October 27 2008 First Release AH401B User s Manual Introduction Safety information Warnings Read over the instruction manual carefully before using the instrument The following precautions should be strictly observed before using the AH401B ARNING e Do not use this product in any manner not specified by the manufacturer The protective features of this product may b2. TRIGGER GATE signal is kept in high state As soon as the TRIGGER GATE signal goes to low state the acquisition stops and no data is sent to the host This behavior continues until the trigger mode is disabled with the TRG OFF default command see TRIGGER GATE Signal paragraph in the I O Connectors chapter The format of the data sent depends on the binary mode setting that can be changed using the BIN command see BIN Command paragraph Examples TRG example with ASCII data RG __ __ _ ACK An TRIGGER GATE pin signal 3124 12001 1222 O n 3133 11991 1342 20v 4 NN TRIGGER GATE pin signal pause TRIGGER GATE pin signal 7924 32101 1442 Ovn 8138 12091 2342 120 n a SM N TRG OFF r _ _ TRG example TRG v a t TRG ONV ot AH401B User s Manual Software Commands 2 2 9 VER Command The purpose of the VER command is to report the firmware version currently installed in the AH401B on board processor Examples VER example VER r PicoNew v 1 1 0 n 25 Software Commands AH401B User s Manual 2 3 Commands Table Summary a Start continuous acquisition Stop continuous acquisition Query acquisition status o Set baudrate 46080 Setbaudrate 1 5400 Setbaudrate 1520 Setbaudrate 5760 Setbaudrae 1 5400 Setb
3. The command syntax used by the AH401B protocol is described in the following paragraphs The commands are sent in ASCII format and are composed by two fields the command field and the parameter field separated by a space Instructions are not case sensitive and therefore the command string can freely use either uppercase or lowercase Each instruction is terminated with a carriage return character 7 or 0x0D in hexadecimal notation e g Command field Space Parameter field Termination character There are two types of software commands configuration commands and yp query commands The query commands usually have the same command field as the configuration commands with a in the parameter field g After each received command the AH401B replies with a string whose content depends on the type of command sent and its correctness There are three possible scenarios with some exceptions as described in the corresponding command paragraph 13 Software Commands AH401B User s Manual 1 the command syntax is incorrect the AH401B will always answer with the string terminated with a carriage return line feed characters W n OxOAOxOD in hexadecimal notation e g BIX example 2 BIN OOG r e 2 the command syntax is correct it is configuration command the AH401B will answer
4. other XPort parameter please refer to the Xport user s guide AH401B User s Manual I O Connectors 4 Connectors This chapter describes the I O connectors their corresponding pinout and the purposes of each signal 4 1 Power Connector In Fig 4 the input Power Connector is shown with its corresponding pinout The input voltage range from 9V up to 15V with a max input current of 350mA depending on the communication module The connector type is LEMO EGG 0B 302 series The corresponding matching connector plug is a LEMO FGG 0B 302 series O Fig 4 Power Connector 4 2 Interface Connector In Fig 5 the I O Interface Connector is shown with its corresponding pinout The signals level are 5V TTL and CMOS compatible The minimum output current is 24mA The connector type is a DSub 9 pin socket 1 0000 Fig 5 I O Interface Connector 35 I O Connectors AH401B User s Manual 4 2 1 The CONV Signal The CONV signal is a copy of the internal Integration Time signal For example with an Integration Time of 100ms the CONV output will be a square wave with the half period equal to 100ms It can be used as a monitor of the internal timing or as synchronization signal for external devices The output voltage level is 5 TTL and CMOS compatible with a minimum output current of 24mA 4 2 2 The TRIGGER GATE Signal The purpose of the TRIGGER GATE signal i
5. 00 LANT MAC Address 00 20 4A 93 F6 86 e Server Settings Network Seria runner Server Configuration Telnet Password ReypePasswor Advanced ARP Cache Timeout TCP Keepalive secs 45 Channel 1 tmas Contiguratie Pine A ei Monitor Mode 8ootup Enable Disable Ropby CPU Performance Mode Reg Serer Port 80 Tu Size 1400 Apply Factory Defautts e Click on the Serial Settings button Set the Baud Rate to 921600 and the Flow Control to None Click the OK button Bie Search Assign IP Upgrade Devices 1 deviceli Device Dotais Web Confipusaton Telnet Local Aves Connection 14010581601 Pon 2 lt XPon 03 femore 461 00 g 1401058100 Veziion 6 1 0 0 Addes 00 20 4A 93 F6 86 Serial Settings Channel 1 Disable Serial Port Port Settings FEET me Qus Rate 921500 8 Panty None 1 Pack Control Enable Packing Serial Tunnel Configurable Pins Apply Settings idie Gap Time 21 Match 2 Bio Sequence ves No Send Frame C ves No Send Trailing Bytes None C One Two Flush Output Butter With Actwe Connect C ves No With Connect C ves No Win Passive Connect Yes No Wath Passive Connect Yes No AiTime of Disconnect C ves No
6. 0xFA0x590x000x020xFA0x59 ACQ OFF example with ASCII data ci NDR 3124 12001 1222 Ov 3133 11991 1342 20 ACQ OFF r ACK r n t ACQ OFF example with BINARY data 0x000x020xFA0x590x000x020xFA0x590x000x020xFA0x590x000x020xFA0x59 nn gt ACK n gt gt example v _ _ _ _ _ ACQ lt AH401B User s Manual Software Commands 2 2 2 BDR Command The purpose of the command is to set the baudrate between the AH401B and the communication module The following table shows the allowed baudrates Command Baudrate BDR 921600 921600 BDR 460800 460800 BDR 230400 230400 BDR 115200 115200 BDR 57600 57600 BDR 38400 38400 BDR 19200 19200 BDR 9600 9600 By default the instrument boots with a 921600 baudrate setting Since the instrument immediately changes the baudrate when the BDR command is accepted no acknowledgement string ACK is sent back to the host The user should verify successful execution of the command by sending another command after changing the host baudrate e g The baudrate change procedure strictly depends on the communication interface module used Please refer to the Communication Module Interfaces chapter for more information Examples BDR example with incorrect parameter BDR 960000 r NAK n BDR example with correct parameter B
7. 1ms and 1s in incremental steps of 100us In order to convert the input data from integrated charge to current the following formula must be applied In ee Agi AH401B User s Manual Introduction In the following table the maximum and minimum currents that can be measured with the AH401B are reported along with the LSB resolution for each capacitor range Equivalent LSB Equivalent LSB Current FS Resolution Current FS Resolution 1ms tint 1ms tint 1s tint 1s tint RNG 0 1 8nA 1 8fA RNG 1 SOpA 50aA RNG 2 100pA 100aA RNG 3 150pA 150aA RNG 4 200pA 200aA RNG5 250pA 250aA RNG 6 300pA 300aA RNG 7 350pA 350aA A host PC is necessary in order to operate the AH401B and properly set the desired parameters i e range and integration time and to acquire the converted data Please refer to the Software Commands chapter for a complete description of available commands their purposes and syntax A fully developed LabView GUI is available allowing to plot the AH401B outputs up to 500 Hz and performing all necessary operations to convert the current data into positional information for all most commonly used Beam Position Monitors geometry It also performs calculation of statistical data on the sampled buffers of data average and rms and most importantly provides the user with a FFT function that is of uttermost importance when using the AH401B as a spectrum analyzer to characterize the vibrati
8. 68 0 11 Group Comments Device Family Port Type XPort 03 ID x5 Hardware Address 00 20 44 93 F6 86 Firmware Version Extended Firmware Version 6 1 0 0 29 Communication Modules AH401B User s Manual e Select Assign a specific IP address and then click Next Assign IP Address Assignment Method Would you like to specify the IP address or should the unit get its settings from a server out the network Obtain an IP address automatically Assign a specific IP address TCP IP Tutorial e Set the IP address Click Next 7 Assign IP Address IP Settings Please fillinthe IP address subnet and gateway to assign the device The subnet will be filled in automatically as you type but please verify it for accuracy Incorrect values in any of the below fields can make it impossible for your device to communicate and can cause network disruption a IP address 192 168 10 200 Subnet mask ETT Default gateway 0 0 0 0 Configuration information is not available for this device The subnet mask and default gateway will not be able to be set After the IP Address has been set successfully then return to this Assign IP Address wizard to set the subnet mask and default gateway lt Back Cancel Help e Click the Assign button Assign IP Address Assignment Click the Assign butt e Wait the Assignment then click Fini
9. AH401B 4 Channel Picoammeter elt User s Manual PWR MONITOR AH401B c L 4 CHANNE PICOAMMETER All Rights Reserved Sincrotrone Trieste S C p A Rev 1 0 October 2008 Sincrotrone Trieste S C p A Strada Statale 14 km 163 5 in AREA Science Park 34012 Basovizza Trieste ITALY Tel 39 040 37581 Fax 39 040 9380902 www elettra trieste it Table Of Contents 1 INTRODUCTION givavccsiisccecisiicccastiscscsiaasccecetesesecdsasccnesssctsesdeesocecsteusseetesscuceseaussese 7 1 1 THE AH401B PICOAMMETER 7 1 2 THE AH401B riceve ne ae asinus 8 1 3 FEATURES pe dinero ani ladina 8 14 do 10 1 5 OFFSET 11 2 SOFTWARE 8 1 1 13 2 1 COMMAND SYNTAX 13 2 2 COMMAND IST REL 15 2 2 1 ACO COTTA suli e 15 2 2 2 BOR Command ER be e aaa ERES 17 2 2 3 BIN Commands ied eR ee ERAS ETSI 18 2 2 4 GET and 22 0 0 000000000000000000 19 2 2 5 E EE RSE 20 2 2 6
10. AtTime of Disconnect C ves No Communication Modules fig Lantonx Devices 1 devicels Device Ortais Web Coniguaton Telnet gl Local Aves Connection 1401105 6 160 Pon EVA hoses tato 7140 105 0 100 00 2 Sip XPon 03 61 00 EE se 1601058100 c Server Serial Tunnel Channel 1 tmas Accept incoming Yes Password Required Configur abio Pure Password Apply Setting Apply Factory Defautts AH401B User s Manual Click on the Connection button Set the Protocol to TCP and the Local Port to 10001 this value can be changed as needed Click the OK button B e 9 Firmar Vezion V6 1 0 0 MAC Address 00 20 4 93 56 86 onnection Settings Active Connection Active Connect Nono zl Start Character qn Hen ModemMode None Mam Esc Seq Pass Thy Yes No qus ation 1009159 Auto increment for active connect Remate Host Remote Port Common Options Telnet Mode Disable Terminal Disconnect Mode On Mdm Cit in Drop Yes No CheckEOT CU D Yes e Click the Apply Settings button Connect Response None LI Use Hostist C vet No LEO Blink Haro Disconnett Yes C No inactivity Timeout 0 6 qmine sees Now the Xport Ethernet device should be correctly configured to work with the AH401B If you need to change any
11. DR 9600 r gt No acknowledgement from the AH401B but the baudrate has been changed In order to verify that the baudrate was effectively changed the BDR command should be sent BDR example v a 921600 n Software Commands AH401B User s Manual 2 2 3 BIN Command The purpose of the BIN command is to change the format of the digital data stream generated by the AH401B picoammeter At power up binary mode is disabled BIN OFF default and data is sent by default in ASCII format With the BIN ON command binary format is enabled and the output values are sent as a continuous binary data stream The binary format helps to improve the data rate transmission as it avoids the overhead due to the ASCII format generation In binary mode the data output format is a continuous sequence of 16 bytes four bytes for each channel see ACQ Command paragraph for details Examples BIN ON example BIN gt ACK An BIN example BIN r lt t BIN OFF AH401B User s Manual Software Commands 2 2 4 GET and Command The purpose of the GET command is to read back a single snapshot of the four channels values The 2 command is a useful shortcut fully equivalent to the GET command The format of the returned values depends on the binary mode setting refer to BIN Command paragraph Examples GET example with ASCII da
12. SR the selected Full Scale Range Value the raw data value from the AH401B Offset the data offset 4096 For a proper estimation of this offset a calibration procedure must be performed see AH401B Offset Calibration paragraph tmr the selected Integration Time AH401B User s Manual Introduction 1 5 Offset Calibration As explained in the previous paragraph an output offset is built into the instrument to allow for the measurements of input signals near and below zero For this reason with an input signal of 0 the read value from the AH401B is equal to 4096 If a precise estimation of this offset is necessary the following procedure must be followed Place on each input connector a shielding cap in order to avoid noise pick up be aware that the central input pin must be left open and shielded but not grounded otherwise the read values are meaningless Switch on the AH401B Let it warm up for about half an hour Acquire a set of data for example 100pts from each input channel and calculate the mean value The calculated mean values are the new Data Offset that must be taken into account in the current evaluation formula see 1 4 that has to be applied to each channel 11 Introduction AH401B User s Manual AH401B User s Manual Software Commands 2 Software Commands This chapter describes the software commands used to tune and read the AH401B picoammeter 2 1 Command Syntax
13. dule Be careful to verify that the module connector and the AH401B receptacle connector are properly aligned e Fix the retaining screw e Switch on the instrument Now the new communication module should be installed and running To properly set up each module please follow the software configuration instructions in the corresponding paragraph 3 2 ETHERPiggy Module The ETHERPiggy module is based on the Lantronix Xport embedded Ethernet device server To properly configure the Xport device the user must configure the IP address the communication protocol and all other network parameters needed by the AH401B Please refer to the Xport documentation and configuration software available at the Lantronix site www lantronix com for a complete description 3 2 1 ETHERPiggy IP Address Assign Every ETHERPiggy module is shipped with a default IP address as indicated on a label on the module itself see Fig 3 Fig 3 ETHERPiggy Module with label Before assigning a new IP address it is required to install on the host PC the DeviceInstaller software that can be downloaded from the Lantronix website www lantronix com Even if the AH401B can be connected on the global LAN a point to point Ethernet connection is strongly recommended in order to insure maximum speed performance and to avoid possible communication problems This implies that the host PC and the ETHERPiggy Module should r
14. e impaired if it is used in a manner not specified in this manual e Do not use the device if it is 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 Introduction AH401B User s Manual The following table shows the general environmental requirements for correct operation of the instrument Environmental Conditions Requirements Operating Temperature Operating Humidity Storage Temperature Storage Humidity 5 C to 45 20 to 85 RH non condensing 20 C to 70 C 5 to 90 RH non condensing AH401B User s Manual Introduction 1 Introduction This chapter describes the general characteristics and main features of the ELETTRA AH401B picoammeter 1 1 The AH401B Picoammeter The AH401B is a 4 channel 20 bit resolution low noise high performance picoammeter It is composed of a particular charge integration
15. ence the sampling rate is halved Please note that the data rate throughput is directly related to the integration time and the half mode selection For example setting the integration time to 10ms and the half mode to disabled HLF OFF generates a data stream at 100Hz Whereas setting the integration time to 10ms and the half mode to enabled HLF ON generates a data stream at 50Hz 20 e AH401B User s Manual Software Commands Examples HLF ON example HLF nn ACK An E HLF example HLF v gt HLF ON n 21 Software Commands AH401B User s Manual 2 2 6 ITM Command The purpose of the ITM command is to set the integration time of the AH401B The parameter field is time expressed in hundreds of microseconds i e if a 100ms integration time is needed the parameter must be set to 1000 The range of the integration time spans from 111 to 15 so the parameter range goes from 10 to 10000 At power up the AH401B integration time is set to 100ms ITM 1000 default by default Examples ITM example for 1ms integration time ITM 10 r lt ACK n ITM example for 200ms integration time ITM 2000 r ACK n ITM example ITM r ITM 1000 AH401B User s Manual Software Commands 2 2 7 RNG Command The purpose of the RNG command is to set the full scale range of the AH401B The parameter field is a number representi
16. eside on the same ethernet subnet i e Host PC address 192 168 10 100 ETHERPiggy address 192 168 10 200 a AH401B User s Manual Communication Modules Please note that in a point to point direct connection a twisted Ethernet cable must be used In order to assign the IP address to the ETHERPiggy module the next steps must be followed e Connect the host PC and the AH401B with a twisted Ethernet cable e Switch on the AH401B e Verify that the Link LED on the RJ45 connector is on amber for a 10Mbps connection or green for a 100Mbps connection and the corresponding Network Connection is active on the host PC The Link LED e Launch the DeviceInstaller program e Select the XPort device where you want to change the IP address Lantronix Devicelnstaller 4 1 0 3 File Edit View Device Tools Help peo Search Assign IP Upgrade UE G Lantronix Devices 1 5 Device Details web Configuration Telnet Configuration A s Local Area Connection 140 105 8 160 o o XPort Property Name Group Comments Device Family XPort Type XPort 03 ID x5 Hardware Address 00 20 44 93 F6 86 Firmware Version Extended Firmware Version 6 1 0 0 Eg Devices 1 devices Device Details web Configuration Telnet Configuration a s Local Area Connection 140 105 8 160 E XPot XPort 03 firmware v6 1 0 0 3e 192 1
17. input stage for low current sensing coupled with a 20 bit sigma delta ADC converter including a noise reduction digital filter The AH401B performs current measurements from 50pA with a resolution of 50 aA up to 1 8uA with a resolution of 1 8 pA with integration times ranging from lms up to 15 Moreover each input channel has two parallel integrator stages so that the current to voltage conversion can be performed continuously also during the ADC conversion avoiding any dead time in the data throughput It also performs digitization of the acquired current data thus strongly minimizing the transmission length of analog current signals from the detector and providing directly digital data output which is easy to transmit over long distances without any noise pick up The AH401B is housed in a light practical and extremely compact metallic box that can be placed as close as possible to the current source detector in order to reduce cable lengths and minimize possible noise pick up during the propagation of very low intensity analog signals It is specially suited for applications where multi channel simultaneous acquisitions are required a typical application being the currents readout from 4 quadrant photodiodes used to monitor X ray beam displacements Low temperature drifts good linearity and the very low intrinsic noise of the AH401B allow obtaining very high precision current measurements The AH401B with its modular communicati
18. ng the selected charge integration range as reported in the following table Equivalent Equivalent Full Scale Current FS Current FS 1ms 1s RNG 0 1 8nC 1 8uA 1 8nA RNG 1 SOpC 50nA SOpA RNG 2 100pC 100nA 100pA RNG 3 150pC 150nA 150pA RNG 4 200pC 200nA 200pA RNG 5 250pC 250nA 250pA RNG 6 300pC 300nA 300pA RNG 7 350pC 350nA 350pA The parameter value can be set from 0 to 7 At power up the AH401B range is set to 1 default corresponding to a full scale range of 50pC Examples RNG example for 100pC Full Scale Range RNG 2 r ACKVWi RNG example for 1 8nC Full Scale Range RNG Ov ACKVWi RNG example RNG r RNG Software Commands AH401B User s Manual 22 8 Command The purpose of the TRG command is to enable disable the trigger mode of the AH401B The trigger mode when enabled TRG ON allows synchronizing the picoammeter data acquisition with an external event for instance laser pulses The trigger mode operation is described in the next paragraph As soon as the TRG ON command is received the AH401B stops data acquisition and waits to receive on the corresponding TRIGGER GATE pin see I O Connectors chapter a trailing edge signal As soon as this signal is detected the AH401B starts to acquire data and immediately and continuously sends it to the host Data is continuously sent to the host if the
19. ntani Devices 1 devicels TINTE di uin Comm ALLA XPon 8 lt XPon 03 vE 1 00 1401058100 Network Server Sertai Tunnel Channel 1 trad Configurable Pins Apply Setting Apply Factory Defautts Device Server Configuration Manager Version 1 3 0 0 e Click on the Network button and set the Subnet Mask to 255 255 255 0 Then click the OK button Lantioni Devices 1 devicele Local Aea Connection 140105 160 E Lo E AY mannna remate 1401059100 Vewion 6 100 MAC Agciesr 00 20 4A 93 F6 86 Network Settings Server Serial Tunnel Obtain IP address automatically Channel 1 Auto Confguration Mezods BOOTP Enable Disable DHCP Enabie C Disanie Enable Disable DHCP Host Apply Settings amp Use te following IP configurazioni Apply Factory Defaults 12 agarose 140 105 8 100 Subnet Matk 255 255 265 0 Defaut Gateway 0000 Configurabio Pins Ethernet Configuration 9 Auto Negotiate Speed 100Mbps 10Mbps Duplex Full C Half AH401B User s Manual Communication Modules e Click on the Server button Set the CPU Performance Mode to High Click the OK button Bay Lonmone Devices 1 deviceli Device Detais Web Configuration Telnet Local Area Connection 140 105 8 160 MY tito 14010581
20. on capability allows the user to freely select the type of communication interface allowing control of the instrument with different types of programming languages and or operating systems Currently available communication modules are RS232 RS422 485 USB and Ethernet TCP IP and UDP The efficient integration realized in the AH410B of the whole acquisition counting and digitization chain in a single compact element allows simplifying and streamlining to a great extent the task to read out at high speed and with extremely low noise X ray detectors while also greatly enhancing the price performance ratio and its user friendliness o_o o o o Introduction 1 2 The AH401B at a Glance In Fig 1 the AH401B and its I O connections can be easily seen AH401B Input Channels 4 CHANNEL PICOAMMETER SINCROTRONE TRIESTE WP AH401B User s Manual PWR MONITOR COMM Fig 1 The AH401B I O Connections 1 3 Features Power Connector LED Activity Monitor Communication Module I O Interface The AH401B input stage is based on a typical charge integrator topology thus the instrument really measures the charge integrated during the selected integration time Eight full scale capacitor ranges are available as reported in the following table Full Scale RNG 0 1 8nC RNG 1 SOpC RNG 2 100pC RNG 3 150pC RNG 4 200pC RNG 5 250pC RNG 6 300pC RNG 7 350pC Whereas the integration time can be varied between
21. onal properties of the X ray beam The FFT can extend up to 250 Hz fully covering the critical 0 100 Hz range where most of the beamlines require extreme stability in order not to spoil the science data acquisition Introduction AH401B User s Manual 1 4 Data Format Since the AH401B works in charge integrator mode the data output values depend on the range and integration time selected For this reason it is important to properly set these parameters in order to avoid input stage saturation and the corresponding data clipping to 0 or to 1048575 the latter being the upper limit before saturation for the AH401B in raw digital data in the output values Moreover as an output offset has been built into the instrument to allow for the measurements of input signals near and below zero this data offset must be taken into account for proper data conversion For this reason an offset calibration procedure must be performed before using the AH401B In the following table the correspondence between the read value and the full scale range is reported Data Value Input Signal 1048575 Full Scale 4096 0 0 0 4 Full Scale The data read from the AH401B are the raw values of the 20 bit ADC converter thus the data conversion from the read values to the corresponding current values must be performed by the user applying the following formula FSR 20 Value Offset t INT with Im the calculated input current F
22. s to synchronize the acquisition of the AH401B with external events e g laser pulses It works in combination with the TRG command please refer to TRG Command paragraph for more details When the trigger mode is enabled by software a trailing edge signal on the TRIGGER GATE input starts the acquisition of the picoammeter the acquisition continues as long as the signal is kept in high state As soon as the TRIGGER GATE signal goes to low state the acquisition stops and no data is sent to the host This behavior continues until the trigger mode is disabled by software The input voltage level is 5 TTL and CMOS compatible AH401B User s Manual Technical Specifications 5 Technical Specifications Input Channels 4 Current Measuring Range from 50 pA to 1 8uA Current Polarity positive only Integration Time from 1ms to 1s Data Transfer up to 1 ksamples s Resolution Bits 20 Noise 1ms 200pCrs ppm Communication Modules RS 232 422 485 USB Ethernet TCP IP and UDP I O Signal CONV output TRIGGER GATE input Supply Voltage from 9 V to 15 V Max Supply Current RS 232 422 485 100 mA USB 150 mA Ethernet TCP IP and UDP 350 mA Dimensions 140 x 110 x 28 mm Weight 420 g Input Connectors BNC 37
23. sh Now the new module IP address should be assigned and the success of the operation can be verified on the DeviceInstaller window m AH401B User s Manual Communication Modules 3 2 2 ETHERPiggy Software Configuration After assigning the IP address the user must configure some other parameters on the Xport device There are two possibilities to configure such parameters e using the web server interface e using a telnet connection In this manual we describe only the web interface procedure if you need to configure via the telnet connection please refer to the Xport user guide Follow the next steps to properly setup the ETHERPiggy communication module e Select the Web Configuration tab then click the Go button Be sure to disable the proxy server option in your Internet Options application go to the Control Panel folder open the Internet Options then click on the Connections tab go to the LAN settings and then deselect the Use a proxy server for your LAN option Edt View Device 15 Hob Pee Sewch Assy TP Upgrade I Device Web Configuration Telnet Contguration BY MY Addons http 140 105 0 100 09 x are 61 00 se 1401052100 e A dialog window will appear asking for user name and password simply click the OK button 31 Communication Modules AH401B User s Manual Lo
24. ta GET r lt 8232 43567 9803 7996 r n example with ASCII data Ar 8232 43567 9803 7996v vi GET example with binary data GET r 0x000x020xFA0x590x000x020xFA0x590x000x020xFA0x590x000x020xFA0x59 SMS example with binary data iv 3 _ 0 000 020 0 590 000 020 0 590 000 020 0 590 000 020 0 59 19 Software Commands AH401B User s Manual 2 2 5 HLF Command The purpose of the HLF command is to select whether to process data from both integrator circuits maximum speed or only from one integrator circuit best noise performance of the AH401B In order to explain the functionality of the HLF command it is useful to describe how the integrator input stage operates A basic feature of the AH401B is that each input channel consists of two parallel integrators A and B so that the current to voltage integration can be performed continuously in time when one of the integrators i e A is digitized by the ADC the input channel is switched to the other integrator circuit i e B and the input current can thus be continuously integrated At the end of the integration time also the second integrator i e B is disconnected from the input and the ADC can start the digitization of the integrated current from B At the same time the input is connected to the previous integrator i e A and therefore the current can continue to be integra
25. ted by A This sequence is continuously repeated as long as the AH401B is in acquisition mode ACQ ON Dead time in the data throughput is thus avoided and the sampled values are continuously sent to the host This mode of operation HLF OFF default is useful when the maximum sampling rate is required since at the end of each integration cycle a digitized data set is sent to the host PC The drawback is a slightly higher noise level on the sampled values due to the integrator capacitors mismatch between A and B and to the charge injection introduced by the internal switches If lowest noise performance is of uttermost importance the HLF ON command must always be used In this operation mode only the integrated current of one integrator i e A is sampled digitized and sent to the host Using only and always the same integrator any capacitors mismatch and charge injection is avoided and the best signal to noise ratio is achieved The operating sequence of this mode is as follow the current is integrated on integrator A for the integration time i e 100ms then the value is digitized and sent to the host During the following integration time i e 100ms no data is digitized the value on the integrator B is discarded and then the sequence repeats itself Therefore a set of data is sent to the host every two integration times i e 200ms The drawback of this mode is that only half sampled values are sent to the host and h
26. udrte 0 Setbaudrate 90 Query baudrate setting Select binary mode Select ASCII mode Query binary mode status GET 1 Read a single snapshot Readasingesnapsho HLF Selecthalfmode ONT Query acquisition mode status Set integration time 1001000 iT ae SetFullScaleRangetol8nC_ 0 Set Full Scale Rangeto50pC_ 1 defaut Set Full Scale Range to 100 20 02 Set Full Scale Range to 150 3 Set Full Scale Rangeto20pC 4L o SetFullScaleRangeto250pC Set Full Scale Range to 300pC 6 Set Full Scale Range to 50 70 2 Query Full Scale Range 27 TRG Settrigger mode ON e Query trigger mode status VER Query firmware version 26 AH401B User s Manual Communication Modules 3 Communication Modules This chapter describes the currently available communication modules RS232Piggy RS422 485Piggy USBPiggy and ETHERPiggy and how to install and configure them 3 3 1 Module Hardware Installation The AH401B is shipped with a communication module already installed as shown in Fig 2 Fig 2 The AH401B with an Ethernet communication module In order to change the communication module type follow these steps e Switch off the instrument e Unscrew the module retaining screw HA Communication Modules AH401B User s Manual e Insert the new mo
27. ween each channel value 1234 9852 1450 5423 r n Chl Space Ch2 Space Ch3 Space Ch4 Termination characters With BIN ON the values are transmitted as a continuous binary data stream without any termination or control character For this reason it is important to keep synchronization with the data flux otherwise it is possible if some bytes are missed to corrupt the data and to get false readings from the instrument If this happens data acquisition must be stopped with the ACQ OFF command and then restarted again slowing down the data throughput rate or increasing the reliability of the communication channel The speed of data transmission is directly given by the selected integration time and the half mode selection see HLF Command paragraph for more information In binary mode the data output format consists of a continuous sequence of 16 bytes four bytes for each channel since each channel value is a long 32 bit data representation with MSB first MSB LSB MSB LSB MSB LSB MSB LSB 0x000x010xFA0xCA0x000x000x1A0x220x000x020xFF0x1A0x000x010xAA0x10 h Ch2 Ch3 Ch4 im 15 Software Commands AH401B User s Manual Examples ACQ ON example with ASCII data ACQ 2 3124 12001 1222 Orv 3133 11991 1342 20 n 4 MMMM L VN ACQ ON example with BINARY data ACQ 0x000x020xFA0x590x000x020xFA0x590x000x02
28. with the string ACK terminated with a carriage return line feed r n characters e g BIN ACK Xn example 2 ITM 1000 ACK rv e a 3 the command syntax is correct and it is a query command the AH401B will answer with the echo of the command field and the value of the requested parameter separated with a space and terminated with a carriage return line feed v n characters e g BIN r BIN ON v 4 20 example 2 ITM v ITM 1000 x n AH401B User s Manual Software Commands 2 2 Command List Please find hereafter the command list used by the AH401B with their syntax the description of their purpose and the description of any special requirements 2 2 1 ACQ Command The purpose of the ACQ command is to start stop the acquisition from the AH401B As soon as the command is received the instrument starts to acquire data and immediately sends the generated digital data stream to the host PC At power up the instrument boots with the acquisition stopped OFF default the user is thus required to start the data acquisition sending the ACQ ON command The type of data transmitted depends on the setting of the binary mode that can be changed using the BIN command see BIN Command paragraph With BIN OFF default data is sent in ASCII mode with the following format ch1 ch2 ch3 ch4V v7 with a space bet
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