AH501C Users Manual
Contents
1. Command The purpose of the TRG command is to enable disable the trigger gate input of the 501 This feature when enabled TRG ON is useful when the picoammeter data acquisition must be synchronized to an external event for instance laser pulses The trigger mode operation is described hereafter As soon as the TRG ON command is received the AH501C stops the acquisition and waits to receive on the corresponding TRIGGER GATE pin see Connectors chapter a trailing edge signal transition As soon as this is detected the AH501C starts to acquire data and to continuously send them to the host data are sent to the host as long as the TRIGGER GATE signal is kept in high state As soon as a falling edge signal transition i e signal goes to low level state is encountered the acquisition stops and no more data are sent to the host This behavior continues whether until the trigger mode is disabled with the TRG OFF default command see TRIGGER GATE Signal paragraph in the Connectors chapter or the driving signal is kept at low level Please note that an acknowledgement string is sent back to the host after a TRG ON or TRG OFF command The format of the data sent depends on the BIN CHN RES and DEC settings previously configured for the picoammeter Activating the trigger mode TRG ON while the trigger gate input pin on the I O connector is not driven has no2. S command Data packet sizes which also define the maximum data rates are listed in the following table 16 bit Resolution 24 bit Resolution 1 Channel 2 bytes 3 bytes 2 Channels 4 bytes 6 bytes 4 Channels 8 bytes 12 bytes Examples ON example with ASCII data ACQ sON r FF3524 s12E001 s 126A52 s03FE41 n 1 3133 s141991 s 1BB342 s 542720 4 VE ON example with BINARY data ACQ sON r 0x000x020xFA0x590x000x020xFA0x590x000x020xFA0x590x000x020xFA0x59 AHS501C User s Manual Introduction S example with ASCII data zu 1F3321 s42E203 s321B22 s03BE43 rv 13312A s132951 s1BB342 s112721 n 5 gt S example with BINARY data 0x000x020xFA0x590x000x020x FA0x590x000x020xFA0x590x000x020xFA0x59 o ooo example ACQ s r Introduction AHS501C User s Manual 2 2 2 BDR Command The purpose of the BDR command is to set the baudrate between the AH501C 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 Since the instrument changes the baudrate right after the command 15 accepted and the acknowledgement string ACK is sent back to the host The user can verify successful execution of the command sending another command after c
3. 2 XPont 03 fimware 6 1 0 0 LANTRONIX SS 140105810 LANTRON IX Firmware Version V6 1 0 0 ii MAC Address 00 20 4 93 6 86 Home Network Server Serial Tunnel Hostlist Channel 1 Serial Settings C tion Configurable Pins O Apply Settings Apply Factory Defaults Device Server Configuration Manager Version 1 3 0 0 Click on the Network button and set the Subnet Mask to 255 255 255 0 then click on the button Lantronix Devicelnstaller 4 1 0 3 Edit View Device Tools Help Search Assign IP Upgrade y Lantronix Devices 1 device s Device Details Web Configuration Telnet C ion gh Local Area Connection 140 105 8 160 5 ie XPort 03 fimware v1 0 0 AN mes usa em Se 140 105 8 100 LANTRON IX e Firmware Version V6 1 0 0 MAC Address 00 20 4A 93 F6 86 Network Settings LANTSONIX IP Configuration C Obtain IP address automatically Auto Configuration Methods BOOTP Enable Disable DHCP Enable C Disable AutolP Enable Disable DHCP Host Name Use the following IP configuration IP Address 140 105 8100 Default Gateway Ethernet Configuration Auto Negotiate Speed 100 Mbps C 10 Mbps Duplex Full Half OK 38 AHS501C User s Manual Eth
4. 4 23 2 2 6 Commands isse 24 2 2 7 EMEN Command RETE enun nen ERI eee 25 2 2 E 26 2 2 9 4 27 2 2 28 2 2 11 EUN Command c eI 29 2 2 18 EUG 4 30 2 2 11 WER 31 2 2 12 OD 31 2 2 1 Table 32 ETHERNEEEONMUNICATION 3 6 34 3 1 34 3 1 1 IP Address 34 3 1 2 Ethernet Module Software esce 37 CONNECTORS EBD Ts 0s0ccsesessoccssessscesossssoessssooossossssnssoess 41 4 POWER CONNECTOR ree hen ne ELO Peta Dried ide AA 41 4 2 T O CONNECTORS o 41 4 21 The TRIGGER OUT 4 42 2 Ihe IRIGGER GATE Input Signal 42 TECHNICAL SPECIFICATIONS ionis oseees sinpesseenteesteaHMbrebi sFE qe ese 43 Document Revision Date Comment April 10 2011 Draft R
5. 1 Serial Tunnel Connect Protea Channel 1 Protocol TCP 9 Connect Mode Passive Connection Active Connection Accept Incoming Yes Active Connect None C Yes Start Character Password Modem Mode None Apply Settings Esc Sei Pass Thru Yes C Apply Factory Defaults Endpoint Configuration Local Port 10001 Auto increment for active connect Remote Port Remote Host Common Options Telnet Mode Disable Connect Response None Terminal Name Use Hostlist C Yes No LED Disconnect Mode On Mdm In Yes Hard Disconnect Yes C No Check EOT Ctr D C Yes No Inactivity Timeout 0 0 mins secs e Click the Apply Settings button The XPort Ethernet device should now be correctly configured to work with the AH501C picoammeter If you need to change any other XPort parameter please refer to the XPort user s guide 5 User s Manual I O Connectors 4 I O Connectors This chapter describes the I O connectors their corresponding pinout and the each signal functionality 4 1 Power Connector The input Power Connector and the corresponding pinout are shown in Fig 4 The input voltage range goes from 6V up to 9V with a rated maximum input current of 410mA depending on the communication module The connector type
6. 20 4A 93 F6 86 Serial Settings Network Server Channel 1 ci Tunnel Disable Serial Port Channel 1 Port Settings Baud Rate 921600 Data Bits 8 v Parity None v Stop Bits 1 v Pack Control Configurable Pins Enable Packing Apply Settings Idle Gap Time i2 msec BAEC ACES Match 2 Byte Sequence C Yes No Send Frame C Yes Match Bytes hc of Send Trailing Bytes None One Two lex Flush Mode Flush Input Buffer Flush Output Buffer With Active Connect C Yes No With Active Connect C yes With Passive Connect C Yes No With Passive Connect C Yes AtTime of Disconnect C Yes No AtTime of Disconnect C Yes No Ethernet Communication AHS501C User s Manual e 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 S Lantronix Devicelnstaller 4 1 0 3 Bile Edit View Device Tools Help Search Assign IP Upgrade S Lantronix Devices 1 devicels Device Details Web Configuration Telnet Configuration E gfg Local Area Connection 140 105 8 160 Xot Addess http 77140 105 8 100 80 28 Extemal Browser XPort 03 firmware v6 1 0 0 A _ e 3e 1401058100 LANT3ON IX i Firmware Version 6 1 0 0 MAC Address 00 20 4A 93 F6 86 Connection Settings Network Channel
7. 4 Analog Voltage Monitors Each input channel of the AH501C picoammeter has its corresponding analog voltage monitor signal available on a SMA connector These four signals are true analog buffered independent inverting stages and are directly proportional to the input current value with a full scale range of 5 These voltage monitors being inverting themselves automatically compensate for the input stages inversion so that positive output voltage values correspond to input current sources positive currents and negative output values to input current sinks negative currents Gain values for the three input ranges in V A are presented in the following table GAIN Vou lin Genes Dae Gunes 2410 Gic 2 10 For example if a tester oscilloscope connected to a channel voltage monitor measures a value of 1 500V and the AH501C is set on RNG 1 the corresponding input current for that channel is of 0 75 uA 750 nA AHS501C User s Manual Introduction 1 5 Bias Voltage Source A low noise voltage source is also available on a BNC connector placed on a module side panel This voltage source is ground referred can be set remotely and has a maximum output value of 30V It is also possible to disable this source by a specific command and so set the output to a high impedance state The red LED on the side panel acts as a status indicator for this voltage source it turns on when output is enabled and turns off as soon as the output
8. Due to the internal bias and offset voltages of its electronic components an offset calibration to eliminate the equivalent input offset current must be performed on each AH501C module If a precise estimation of this offset is necessary the following procedure must be performed Install on each input connector SMA or BNC 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 AH501C warm up for about half an hour Acquire a set of data for example 10000 pts from each input channel and calculate the mean value Repeat the previous step for each gain range RNG 0 RNG 1 and RNG 2 The calculated mean values are the new Data Offsets that must be taken into account in the current evaluation formula that must be applied for each channel It may be preferable to calculate this offset as the median of collected data to avoid errors caused by unwanted rectified impulsive noise AHS501C User s Manual Introduction 2 Software Commands This chapter describes the software commands used for tuning and readout of the AH501 picoammeter 2 1 Command Syntax The command syntax used by the AH501 protocol is described in the following paragraphs Commands must be sent in ASCII format and are composed by two fields the command field and the parameter field separated by a space
9. Examples HVS example HVS s r HVS OFF HVS ON example HVS sON r HVS value example HVS s19 22 r HVS example HVS s v HVS 19 22vN1 Introduction AHSOIC User s Manual 2 2 8 Commands The purpose of the NAQ command is to read a fixed number of samples ranging from 1 to 2000000000 without having to manually stop the acquisition i e with the S command when the desired number of samples has been read The format of the returned values depends on the binary mode setting refer to BIN Command paragraph the resolution settings and the active channels settings Examples NAQ example with ASCII data NAQ s12 r 44823 1 s4A3567 s9EE222 s714596 1 448234 s4A3976 s9EE323 s711912 r n 448566 s4A3433 s9E1LA10 s714955 n 448243 s4A3567 s9EE803 s71A116 n 441332 s4A3555 s9E4543 s711888 1 44823 1 s4A3B65 s9E5802 s7 10990 44823 1 54 5 4 59 2 5 5711946 44843 1 s4A1111 s9EE661 s71C750 1 448230 s4A3421 s9EBD 13 s713216 1 44800 1 s4CC569 s9EE663 s71432C 1 448234 s4 AB45 I s9E124A s71 BOBOV Vi 448324 s4A6564 s9EAA03 s732436 r 1 LA E E E ACK n 26 AHS501C User s Manual Introduction 2 2 9 RES Command The purpose of the RES command is to select whether to use 16 bits or 24 bits to represent sampled values obtained from the on board delta sigma modulator ADCs The use of this feature determines the maximum data transfer rate of
10. Ns or 0x20 in hexadecimal notation Instructions are not case sensitive and therefore the command string can freely use either uppercase or lowercase characters Each instruction is terminated with a carriage return character Ww or OxOD e g Command field Space Parameter field Termination character There are two types of software commands configuration commands and query commands The query commands usually have the same command field as the configuration commands and a in the parameter field The AH501C after each received command 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 1 the command syntax is incorrect the AH501C will always answer with the string terminated with carriage return line feed characters or OxOAOxOD in hexadecimal notation e g BIX sON r Introduction AHSOIC User s Manual example 2 BIN sOOG r 2 the command syntax is correct and it is a configuration command AH501C will answer with the string terminated with carriage return line feed Yn characters e g BINS ONV example 2 RES s24 r ACKVWi 3 the command syntax is correct and it is a query command the AH501C will answer with the ech
11. be sampled the AH501C provides the capability to simultaneously sample 1 2 or 4 channels Channels on which sampling is performed are indicated in the following table default power up value is CHN 4 Sampled Channels CHN s1 r Chat CHN s2 r Ch 1 Ch 2 CHN s4 r Gn SG nud The overall sampling frequency of the system is determined by the value set with this command Examples CHN example CHN s2 r CHN example with incorrect parameter CHN s5 r CHN example CHN s v CHNW4VVi AHS501C User s Manual Introduction 2 2 5 DEC Command The DEC command can only be used when working in BIN OFF mode i e data is transmitted as ASCII characters and is a function that if enabled performs the two s complement offset correction directly on the AH501C processor If this offset correction is enabled data values are sent in the usual ch1 ch2 ch3 ch4 vv format with a hexadecimal representation 003234 18512 5 LECO7 s66A60A An when working in 24 bit resolution mode data width is 6 byte sample 0032 sF185 s5 LEC s66A6 n when working in 16 bit resolution mode data width is 4 byte sample This feature is disabled DEC OFF at device power up Examples DEC example DEC sON r ACKVNi DEC example DEC s r DECS ONY Introduction AHSOIC User s Manual 2 2 6 GET and G Commands The purpose of the GET command is to read back a si
12. is LEMO EPG 0B 303 series The corresponding matching connector plug is a LEMO FGG 0B 303 series Pi Si p V Q 3 E Fig 2 Power Connector 4 2 Connectors The I O interface signals gate trigger are available SMA type connectors The signal levels are 5V TTL and CMOS compatible The maximum output current is 25mA or a 2000 load 4 2 1 The TRIGGER OUT Signal The TRIGGER OUT signal is a 5V TTL CMOS compatible signal toggling at every ADC conversion cycle and it can be used as a synchronization signal for external devices or just to monitor the module internal conversion timing This pin is driven by an output buffer that is capable of driving loads down to 1500 0 25V Vor 4 2V 9 I O Connectors AHSOIC User s Manual 4 2 2 The TRIGGER GATE Input Signal The presence of the TRIGGER GATE input signal leaves to the user a chance to synchronize the acquisition of the AH501C with an external event e g laser pulses A leading edge signal on the TRIGGER GATE causes the acquisition of the picoammeter to start and the trailing edge of the same signal causes it to stop The acquisition process continues as long as the signal is kept at the high voltage level Vin 3 8V as soon as the TRIGGER GATE signal crosses the logic low level threshold Vi 1 2V the acquisition stops and no data is being sent to the host This feature allows the user to receive only data
13. is disabled Typical values of RMS Root Mean Square noise are of 0 00396 at rated output voltage value The short circuit current value for this output is 3mA and the minimum time constant is 100 ms it increases along with the load capacitive part 1 6 Data Format Since the AH501C has three different input gain values and two possible resolution modes 16 and 24 bit output values depend on the selected configuration For this reason it is important to properly set the gain value in order to avoid input stage saturation and corresponding data clipping of the output values to 8388608 or to 8388607 in 24 bit resolution mode and to 32768 or to 32767 in 16 bit resolution mode Moreover it is very important to perform an offset calibration procedure before using the picoammeter In the following table the correspondence between the read value and the full scale range is reported note that the input stage is inverting Data Value Hex Value Input Signal 32768 0 8000 Full Scale 32769 0x8001 Full Scale LSB 65535 OxFFFF LSB 0 0 0000 0 1 0 0001 LSB 32766 Ox7FFE Full Scale LSB 32767 Ox7FFF Full Scale Data value in 16 bit resolution mode Data Value Hex Value Input Signal 8388608 0x800000 Full Scale 0 0x000000 0 8388607 Ox7FFFFF Full Scale Data value in 24 bit resolution mode Introduction AHS501C User s Manual The data read from the AH501C are the raw values of the A D converter thus the data conversion from the r
14. related to a hardware determined time window The input voltage high level is 5 TTL and CMOS compatible 501 User s Manual Technical Specifications 5 Technical Specifications Input Channels 4 Current Measuring Range from 2 5 nA to 2 5 mA Voltage Monitors Yes Current Polarity bipolar Data rate up to 26 ksamples s Resolution Bits 16 or 24 RMS Noise CQ RNG2 Cy 5pF 200 fA Bias Voltage RMS Noise 0 00396 Communication Ethernet TCP IP and UDP Signal TRIGGER GATE input TRIGGER OUT Supply Voltage from 6 V to 15 V Bias Voltage Output to 30V Voltage Monitors Yes 5 V Dimensions 160 x 108 x 45 mm Weight 500 Input Connectors BNC Voltage Monitor Connectors SMA Communication Interface Ethernet 10 100 TCP IP or UDP
15. the AH501C when running in continuous mode i e ON and BIN The default value at power up is set to 16 bits Examples RES example RES s24 r ACKVNi RES example RES s r RES s16 7 1 Introduction AHS501C User s Manual 2 2 10 RNG Command The purpose of the RNG command is to set the gain and therefore the full scale range of the AH501C The parameter field is a number representing the selected gain range as reported in the following table Resolution Full Scale 24 bit RNG 0 2 5 298 nA RNG 1 2 5 298 fA RNG 2 2 5 nA 298 aA The parameter value can be set from 0 to 2 at power up the AH501C range is set to its lowest gain value 0 default in order to avoid possible damages to the device in case some of its inputs are connected to a high current source sink at start up Examples RNG example for a 2 5nA Full Scale Range RNG s2 r RNG example for a 2 5 Full Scale Range RNG sO r RNG example RNG s v ACKVNi 50 AHS501C User s Manual Introduction 2 2 11 SYN Command The purpose of the SYN command is to synchronize the four on board analog to digital converters The task performed by this command is automatically executed at device power up and shall not be performed again when using the AH501C device This is a command to be used only for debugging purposes Introduction AHS501C User s Manual 2 2 12
16. 0 kHz 4 Channels 6 510 kHz 3 255 kHz Sampling frequencies when receiving raw binary data _ AHS501C User s Manual Introduction The sampling periods dilate when working with ASCII data values that require computational time to be formatted reaching the values here listed 16 bit Resolution 24 bit Resolution 1 Channel 384 us 499 2 us 2 Channels 806 4 us 998 4 us 4 Channels 1 6128 ms 1 9968 ms Sampling frequencies when receiving ASCII formatted data The corresponding sampling frequencies for each channel in this mode are then 16 bit Resolution 24 bit Resolution 1 Channel 2 604 kHz 2 003 kHz 2 Channels 1 240 kHz 1 002 kHz 4 Channels 620 0 Hz 500 8 Hz Sampling frequencies when receiving ASCII formatted data Adding the offset binary two s complement correction DEC ON command see section 2 2 5 for additional information the sampling periods become 16 bit Resolution 24 bit Resolution 1 Channel 422 4 us 537 6 us 2 Channels 844 8 us 1 0752 ms 4 Channels 1 6896 ms 2 1504 ms Sampling periods when receiving ASCII formatted data with offset binary 275 complement correction and the sampling frequencies the following ones 16 bit Resolution 24 bit Resolution 1 Channel 2 367 kHz 1 860 kHz 2 Channels 1 184 kHz 930 1 Hz 4 Channels 591 9 Hz 465 0 Hz Sampling frequencies when receiving ASCII formatted data with offset binary 2 s complement correction Introduction 501 User s Manual 1 8 Offset Calibration
17. AH5o1C 4 Channel Bipolar Picoammeter with Bias Voltage Source 13 Se Geor or Science User s Manual All Rights Reserved CAENels d o o Rev 1 0 April 2011 This product is licensed by Sincrotrone Trieste S C p A TO elettra e CAENels Kra ka ulica 2 6210 Se ana Slovenija Mail info caenels com Web www caenels com Table Of Contents 1 5 INTRODUCTION M MEE 8 1 1 THE AH501C PICOAMMETER EEEE 8 1 2 501 ATA GLANCE dni 9 1 3 FEATURES 9 1 4 ANALOG VOLTAGE MONITORS 10 1 5 BIAS VOLTAGE SOURCE 11 1 6 DATA FORMAT uui baies valise Epod o aee DR E R rE E 11 1 7 SAMPLING FREQUENCY iar aaaea iaeaea Dra ariaa Eea 12 1 8 OFFSET CALIBRATION Eee arser rera anri 14 SOFTWARE COMMANDS 15 2 1 COMMAND SYNTAX _ 15 2 2 LIST OF COMMAND S ___ 17 2 2 1 ACQUE 17 2 2 2 eese 20 2 2 3 21 2 2 4 55 0 5 22 2 2 5 MEN
18. H501C communication is guaranteed by a standard Ethernet TCP IP and UDP AHS501C User s Manual Introduction 1 2 The AH501C at a Glance The 501 and its I Os are represented in Fig 1 Voltage Monitors NS FERA LED T Activity Monitors 501 M Trigger In S VoL Bias Voltage Trigger Out Power Connector Fig 1 The AH501C I O Connections 1 3 Features The AH501C input stage is based on a multi path inverting transimpedance amplifier I V converter cascaded with signal conditioning stages Three measuring ranges are available as reported in the following table Full Scale RNG 0 2 5 mA RNG 1 2 5 uA 2 2 5 nA The corresponding gain values for these three input ranges are 9 Introduction AHS501C User s Manual Gain V A RNG 0 10 RNG 1 10 RNG 2 10 The maximum and minimum currents that can be measured with the AH501C are reported along with the LSB resolution for each range in the following table Full Scale Resolution Resolution 16 bit 24 bit RNGO 2 5 mA 76 nA 298 nA RNG1 2 5 76 298 fA RNG2 2 5 nA 76 fA 298 aA A host PC is necessary in order to operate the AH501C and properly set check the desired parameters i e range and resolution bits and to acquire the converted data Please refer to the Software Commands chapter for a complete description of available commands their purposes and their syntax 1
19. ary mode status 01 CHN Set readings to only 1 channel Set readings to 2 channels Set readings to 4 channels 4 default Query channel settings DEC Select offset correction __ Devselect offset correction OFF defaut Query offset correction status GET Readasingle snapshot O Ov Readasingesnapsho HVS Set Bias VoltageOn_ Set Bias Voltage Off defaut SetBiasVolageto value _ value Query Bias Voltage NAQ Read a fixed number of samples 1 2000000000 RES Setresouionto24bits A Query resolution setting RNG Set Full Scale Range to llmA 01 default SetFullScaleRangeto 644A SetFulScaleRangeto 25n 2 S Stops continuous acquisition default SYNv Synchronize internal ADCs TRG Enable trigger gate input Disable trigger gate input OFF default Query trigger mode status VER Queryfirmware version Ar Geneatsonline Help text AHS501C User s Manual Introduction Ethernet Communication AHS501C User s Manual 3 Ethernet Communication This chapter describes available communication module for the AH501C and gives hints on how to configure it 3 1 Communication Module The communication module is based on the Lantronix embedded Ethernet device server To properly configure the Xport device the user m
20. dress automatically Assign a specific IP address Tutorial e Set the IP address Click Next Assign IP Address IP Settings Please fill in the 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 IP address 192 168 10 200 Subnet mask se es eee Default gateway 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 Back Cancel Help e Click the Assign button e Wait for the assignment procedure to end then click Finish The new module IP address should now be already assigned and the success of the operation can be verified on DevicelInstaller window _ AHS501C User s Manual Ethernet Communication 3 1 2 Ethernet Module Software Configuration After assigning the IP address the user must configure some other parameters on the XPort device There are two possible ways to configure such parameters e the web server interface atelnet connection In this manual only the web interface procedure i
21. ead values to the corresponding current values must be performed by the user applying the following formula for the 16 bit resolution mode 23 is Value Offset Value Offset if Value 32767 Geno 05 1 2 ul 1 65535 Value Offset if Value gt 32768 and the following one when working in 24 bit resolution mode Value Offset if Value lt 8388607 In ESR on ee 16777215 Value Offset if Value gt 8388608 where Tw the calculated input current GnNGx the selected range gain FSRx the selected Full Scale Range Value the raw data value from the AH501C Offset the raw data offset For a proper estimation of this offset a calibration procedure must be performed please refer to the AH501C Offset Calibration paragraph 1 7 Sampling Frequency The AH501C sampling frequency depends either on resolution data stream format and number of channels please refer to List of Commands chapter to see how to set these values When receiving a non formatted binary data stream the sampling periods for each channel are represented in the following table 16 bit Resolution 24 bit Resolution 1 Channel 38 4 us 38 4 us 2 Channels 76 8 us 153 6 us 4 Channels 153 6 us 307 2 us Sampling period when receiving raw binary data corresponding to the following sampling frequencies 16 bit Resolution 24 bit Resolution 1 Channel 26 042 kHz 13 021 kHz 2 Channels 13 021 kHz 6 51
22. effects Examples TRG example with ASCII data TRG ON r TRIGGER GATE pin signal f 3124 IF01 1222 OAAC n 3133 1F04 1552 TRIGGER GATE pin signal pause TRIGGER GATE pin signal 3134 1 21 1332 OABB n 3128 1EB8 1221 0A95vvi TRG OFF r ACKVWi TRG example TRG TRG ONV AHS501C User s Manual Introduction 2 3 41 VER Command The purpose of the VER command is to report the firmware version currently flashed into the AH501C on board processor Examples VER example VER s r __VER sAH501 sv 1 0 V 1 2 2 12 Command The command generates a reply that contains the device on line help the purpose is to give users important information about the AH501C features data formats and some data stream examples The use of this command is very useful when using the picoammeter in a text Winsock based application such as HyperTerminal without being able to access the device user s manual Introduction AHSOIC User s Manual 2 2 13 Command Table Summary Power Up Start continuous Query acquisition status Set baudrate 460800 O Set baudrate 230400 _ Setbaudate 1520 Pais Setbaudrate 88400 O Setbaudrate 1 Setbaudate GJ Query baudrate setting O BIN Selctbinaymode defaut SelEcASCHmode OFF Query bin
23. elease April 19 2011 Safety information Read the instruction manual carefully prior to using the instrument The following precautions should be strictly followed before using the 501 ARNING e Do not use this product in any manner not specified by the manufacturer The protective features of this product may be impaired if it is used in a manner not specified in this manual e Do not use the device if it is damaged Inspect carefully the outer case for possible cracks or breaks before each use e Do not operate the device if explosive gases vapors or excessive dust is present e Always use the device with its original cables e Power off the device before establishing any connection to from it e Do not operate the device for any reason with side covers 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 AHS501C User s Manual The table below reports the general instrument Environmental Conditions Introduction environmental requirements for the Requirements Operating Temperature Operating Humidity Storage Temperature Storage Humidity 0 C to 55 C 20 to 85 RH non condensing 20 C to 70 C 5 to 90 RH non condensin
24. ernet Communication e Click on the Server button Set the CPU Performance Mode to High and then click on the button Lantronix Devicelnstaller 4 1 0 3 Bile Edit View Device Tools Help Search Assign IP Upgrade Lantronix Devices 1 devicels Device Details Web Configuration Telnet Configuration S gh Local Area Connection 140 105 8 160 T Sao Addeshtp 14005810090 iot 03 imwa 6100 AN 0 Se 1401058100 Server Settings LANTRON IX i Firmware Version V6 1 0 0 MAC Address 00 20 4A 93 F6 86 c Server Configuration Telnet Password Retype Password Advanced ARP Cache Timeout secs Keepalive secs Monitor Mode Bootup Enable C Disable CPU Performance Made HTTP Server MTU Size e Click on the Serial Settings button Set the Baud Rate to 921600 and the Flow Control to None Click on the OK button Lantronix Devicelnstaller 4 1 0 3 Bile Edit View Device Tools Help ee Search Assign IP Upgrade Lantronix Devices 1 device s Device Details Web Configuration Telnet Configuration 8 Local Area Connection 140 105 8 160 amp C xPot 7 E i XPort 03 firmware v6 1 0 0 LANTSONIX 1401058100 LANTRON IX Firmware Version 6 1 0 0 Address 00
25. g Introduction AHS501C User s Manual 1 Introduction This chapter describes the general characteristics and main features of the AH501C picoammeter 11 The AH501C Picoammeter CAENels AHSOIC is a 4 channel 24 bit resolution wide bandwidth ultra wide input dynamic range picoammeter with an integrated bias voltage source It 15 composed of a specially designed transimpedance input stage for current sensing combined with analog signal conditioning and filtering stages making use of state of the art electronics This device can perform bipolar current measurements from 2 5 nA with a resolution of about 300 aA up to 2 5 mA resolution of 300 pA with sampling frequencies up to 26 kHz for 1 channel and a 16 bit resolution and 6 5 kHz 4 channels 16 bit sample Low temperature drifts good linearity and very low noise levels enable users to perform very high precision current measurements This new version has also buffered voltage monitors that are proportional to the measured input current The 501 is housed in a light robust 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 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 The A
26. hanging the host baudrate e g BDR The baudrate change procedure strictly depends on the communication interface module used Please refer to the Communication Module Interfaces chapter for more information By default the instrument boots with a 921600 baudrate setting Examples BDR example with incorrect parameter BDR s960000 r example with correct parameter BDR s9600 r Acknowledgement from the AH501 before the change of baudrate BDR example BDR s r BDR s921600 1 om AHS501C User s Manual Introduction 2 3 5 BIN Command The purpose of the BIN command is to change the format of the digital data stream generated by the AH501C picoammeter At power up binary mode is enabled BIN ON default and data is sent as a continuous binary data stream With the BIN OFF command the ASCII format is enabled and the output values are sent as strings The binary format helps to improve the data rate transmission as it avoids the overhead due to the ASCII format conversion In binary mode the data output format is a continuous sequence of bytes see Command paragraph for details Examples BIN ON example BINSONV lt BIN example BIN s v Introduction AHS501C User s Manual 2 2 4 CHN Command The purpose of the CHN command is to set the number of active input channels to
27. ith 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 acquisition must be stopped with the S without carriage return command and then restarted increasing the reliability of the communication channel The speed of data transmission is directly related to the number of active read channels and the resolution of data samples In binary mode 4 channels and a 24 bit resolution the data output format consists of a continuous sequence of 12 bytes 96 bit packet three bytes for each channel since each channel sample is 24 bit wide MSB first MSB LSB MSB LSB MSB LSB MSB LSB 0x000x010xFA0x000x000x1A0x220x000x020xFF0x1A0x00 _ 7 d Chl Ch2 Ch3 Ch4 In binary mode with 4 active channels and a 16 bit resolution the data output format consists of a continuous sequence of 8 bytes two bytes for each channel MSB first 9 Introduction AHS501C User s Manual MSB LSB MSB LSB MSB LSB MSB LSB 0x200x0 1 0 0 320 0 0 1 A0x220x5 1 Chl Ch2 Ch3 Ch4 In binary mode with only 1 active channel and a 24 bit resolution the data output format consists of a continuous sequence of 6 bytes 48 bit packet MSB LSB MSB LSB 0x200x01 0 0 32 Chl Ch2 Please note that no acknowledgement string is sent back to the host after an ON command while an command is returned after the acquisition is stopped with
28. ngle snapshot of the values for the active channels The command is a useful shortcut fully equivalent to the GET command and it is implemented to further reduce delays caused by data transmission and handling The format of the returned values depends on the binary mode setting refer to BIN Command paragraph the resolution settings and the active channels settings Examples GET example with ASCII data GET s r _448231 54 3567 59 803 5 711996 example with ASCII data Gv 44823184A356 S9EE803V711996V vi GET example with binary data GET s r 0x000x020xFA0x590x000x020xFA0x590x000x020xFA0x590x000x020xFA0x59 example with binary data 0x000x020xFA0x590x000x020xEA0x590x000x020xFA0x590x000x020xFA0x59 AHS501C User s Manual Introduction 2 2 7 HVS Command The HVS command let the users set and read the Bias Voltage output status value It is necessary to enable the bias voltage circuitry first in order to set a voltage value i e send the command HVS ON The red LED on the AH501C side panel should turn on The command HVS OFF disables the bias voltage output putting it in an high impedance state The voltage value up to 30V can be set by sending a HVS xx xx command to the AH501C where xx xx is the desired voltage value in Volts It is also possible to check the bias voltage circuitry status by sending a HVS command
29. o of the command field and the value of the requested parameter separated with a space and terminated with carriage return line feed characters e g BINW y BINSONV Wi example 2 RESWAr RES s24 n1 AHS501C User s Manual Introduction 2 2 List of Commands Please find hereafter command list used by the 501 and the corresponding syntax the description of each command purpose and any special requirements relating to specific commands 2 2 1 ACQ Command The purpose of the ACQ command is to start stop the acquisition from the 501 The instrument starts to acquire data as soon as the command is received and immediately sends the generated digital data stream to the host PC At power up the instrument boots with the acquisition stopped default the user is required to start the data acquisition sending the ACQ ON command The type of transmitted data depends on the setting of the binary mode and can be changed using the BIN command see BIN Command paragraph With BIN OFF data is sent in ASCII mode with the format ch1 ch2 ch3 with a space between each channel value 2F1234 s9A85 12 s 14ESEO S548423 nAn 1 Chl Space Ch2 Space Ch3 Space Termination characters With BIN ON default digital values are transmitted as a continuous binary data stream without any termination or control character For this reason it is important to keep synchronization w
30. or a 100Mbps connection and the corresponding Network Connection is active on the host PC The Link LED Launch Devicelnstaller program Select the XPort device where you want to change the IP address S Lantronix Devicelnstaller 4 1 0 3 Edit view Device Tools Help PA Search Assign IP Upgrade L Lantronix Devices 1 device s Device Details web Configuration Telnet Configuration g Local Area Connection 140 105 8 160 Property Name Group Comments Device Family Port Type XPort 03 ID Hardware Address 00 20 44 93 F6 86 Firmware Version B Extended Firmware Version 5 1 0 0 Click on the Assign IP icon S Lantronix Devicelnstaller 4 1 0 3 Device Tools Help Search Assign IP Upgrade 8 E LatwewffDevices 1 device s Device Details web Configuration Telnet Configuration g Local rea Connection 140 105 8 160 C3 XPort c XPort 03 firmware v6 1 0 0 P BE pen Name Group Comments Device Family Port Type XPort 03 ID 5 Hardware Address 00 20 44 93 F6 86 Firmware Version 10 Extended Firmware Version 6 1 0 0 Ethernet Communication 501 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 on the network Obtain an IP ad
31. s described if you need to configure the module using a telnet connection please refer to the XPort user guide Follow the next instructions to properly setup your AH501C communication module e Select the Web Configuration tab and then click on Go button Be sure to disable the proxy server option in your Internet Options application To do so 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 Jii Lantronix Devicelnstaller 4 1 0 3 File Edit Device Tools Help Search Assign IP Upgrade Device Details Web Configuration Telnet Configuration m EY Address http 77140 105 8 100 80 QE __External Browser LANTRONIX antionix Devices 1 device s ocal Area Connection 140 105 8160 Port XPort 03 firmware v6 1 0 0 SS 140 105 8100 e dialog window asking for user name and password will appear simply click on the OK button Ethernet Communication 501 User s Manual e The Lantronix web server interface will now appear 3 Lantronix Devicelnstaller 4 1 0 3 Bile Edit View Device Tools Help pee Assign Upgrade Bay Lantronix Devices 1 devicels Device Web Configuration Telnet Configuration gh Local Area Connection 140 105 8 160 C3 xPot
32. ust configure the IP address the communication protocol and all other network parameters needed by the AH501C Please refer to the Xport documentation and configuration software available at the Lantronix site www lantronix com for a complete description 3 1 1 IP Address Assignement The module is shipped with a default IP address as indicated on the label on the module itself Factory settings are address 192 168 0 10 port 10001 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 AH501C can be connected to the global LAN a point to point Ethernet connection is strongly recommended in order to obtain minimum delay maximum speed performance and to avoid possible communication problems This implies that the host PC and the AH501C should reside on the same Ethernet subnet i e Host PC address 192 168 10 100 AH501C address 192 168 10 200 Please note that for a point to point direct connection a twisted Ethernet cable must be used AHS501C User s Manual Ethernet Communication The next few steps must be followed in order to assign a new IP address to the module e Connect the host PC and the AH501C with a twisted Ethernet cable Switch on the AH501C Verify that the Link LED on the RJ45 connector is turned on amber for a 10Mbps connection or green f
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