EX2108/ EX2116 - VTI Instruments
Contents
1. FIGURE 3 8 MULTI EXPANDER SYSTEM 3 toa 3 toa 3 tha 4 toa 4 tou 4 tpa terminated 5 toa 5 toa terminated terminated In multi expander configurations worst case synchronization skews can be minimized by placing the Master device as close to the center of the system as possible This shortens the total distance to all the system edges This worst case propagation delay is to the furthest device away from the master in the system 20 EX2108 16 Basic Operation www vtiinstruments com INDEX C D daisy chain extender mode sss 16 18 19 declaration of conformity le SIES OIE Re im eR e Hen EUR HO EE ee H hybrid star daisy chain mode sss 16 18 19 I installation location eerte eren ocn tenete 13 J jumper switches certi eret c EER eg SR ske Be Ee ES ae 17 L7 L LX compatibility rarene m Rte 9 M MASTER PORT 2 2 Sed multi expander test systems P POWETTOPUb e M A 11 R rear panel lay Ubicada fouting modes ideada sides TR ee DEE daisy chain extender mode 3 hybrid star daisy chain mode sss 16 S Specifications Winrar 11 synchronization skew iese ese see ke Re Re Ge Ge Re Re Re Re 18 system terminology T System topography entente SES SR EER dee entrance those ee T trigger channel bandwidth2. sss 11 TRIGGER PORTS erret n ia 15 16 18 W uri M 5 EX2108 16 Index 21
3. VII Mm Instruments EX2108 EX2116 VTI TRIGGER BUS EXPANDER USER S MANUAL P N 82 0114 000 Released April 22 2009 VTI Instruments Corp 2031 Main Street Irvine CA 92614 6509 949 955 1894 VTI Instruments Corp TABLE OF CONTENTS INTRODUCTION ETE SE OO EE 3 EEU AR EE EE OE RE EE EE EE EE N 3 Lanntation of Warranty ete OE RE EE EE ER N 3 Rights Pe uie EE o UU t UO ERE RR ERE UTR ERRERE 3 DECLARATION OF CONEORMITY 5 iepickt ete t P ER RI OR EEUU EORR Er aS FUR pe e EPOR Rentner ges 4 GENERAL SAFETY INSTRUCTIONS beige beg o rte rh NN TON 5 Terms and Symbols ete E ete UR REG sv sasvous OE IK 5 Eie d RET 5 SUPPORT RESOURCES SS Dt Ge telo pibe biete ate tea rat GR 7 SECTION 1 M gt INTRODUCTION EE EE ro epa PROMIS Ep EE e ast FO EURO NT ete E RM TAE 9 OVerVIe Ws coetu testor or oct hide dtp OI entr eee 9 EX2108 16 Specifications dato did 11 Maximizing Measurement Performance iese see see ee eene enne entrent nent tenete nnne rennen 12 Multi Expand r Test Systems crac dcha piba dee e En e D PO sacarlo cod 12 PREPARATION FOR USE RE EE eerte t Hee eo re i ape e rie ei ere 13 VEL VIEW S 13 Unpacking tati ette it ns 13 Installation Location 13 Input Connections WIDE D epe D RR ER OO ee aes 13 VTI Trigger Bus BASIC OPERA
4. 14 EX2108 16 Preparation for Use www vtiinstruments com SECTION 3 BASIC OPERATION INTRODUCTION This section expands on the description of the EX2108 16 s features and explains how to best use them REAR PANEL LAYOUT The rear panel of the EX2108 16 has eight and sixteen trigger bus connectors respectively The MASTER PORT must connect to the chain containing the device that is configured as a master in the test system see the master device s user s manual for more information on configuration TRIGGER PORTS retransmit the MASTER PORT input signals in one of two different routing modes As stated in Section 1 the TRIGGER PORTS of the VTI trigger bus expanders are internally terminated eliminating the need for external termination blocks on any of the EX2108 16 ports The terminal device in a trigger bus chain however still requires termination blocks 90 264 VAC 50 60 Hz 25VA MAX VXI Technology MASTER PORT TRIGGER PORT2 TRIGGERPORTA TRIGGER PORTS FIGURE 3 1 EX2108 REAR PANEL ROUTING MODE CONFIGURATION The routing modes of the EX2108 16 are specific to EX1629 trigger bus use The EX1629 synchronization scheme uses four trigger bus channels The EX2108 16 route these signals from the MASTER PORT to the TRIGGER PORTs The EX2108 16 has two routing modes Daisy Chain Extender Mode and Hybrid Star Daisy chain Mode which provide similar yet slightly different capabilities
5. Output Port 5 Output Port 6 Output Port 7 Mode P15UN P14LN P14UN P13LN P13UN P12LN P12UN P11LN P11UN P10LN P10UN P9LN P9UN P8LN P8UN Off Off Off Off Off Off Off Off Off Off Off Off Off Off Off Off Lower N A On Off On Off On Off On Off On Off On Off On Off Upper On Off On Off On Off On Off On Off On Off On Off On Both N A On On On On On On On On On On On On On On Port 10 Port 11 Port 12 Port 13 Port 14 Port 15 Mode P7LN P7UN P6LN P6UN P5LN P5UN P4LN P4UN P3LN P3UN P2LN P2UN P1LN P1UN POLN POUN Off Off Off Off Off Off Off Off Off Off Off Off Off Off Off Off Off Lower On Off On Off On Off On Off On Off On Off On Off On Off Upper Off On Off On Off On Off On Off On Off On Off On Off On Both On On On On On On On On On On On On On On On On FIGURE 3 5 EX2116 JUMPER LOCATIONS amp MODE CONFIGURATIONS SYNCHRONIZATION SKEW When setting up a system with a trigger bus expander synchronization skew must be taken into consideration It is most pertinent when tight synchronization is required throughout a system Accounting for this delay can complicate system configuration but by making these considerations tighter system synchronization can be achieved If a system with a single trigger bus expander is required the only configuration decision that must be made is whether to use the daisy chain extender or hybrid star daisy chain mode This issue mainly
6. affects the complexity of EX1629 software setup verses the Master Chain to Output Chain delay Figure 3 6 shows a typical system using an EX2108 16 in daisy chain extender mode To simplify the discussion it will be assumed that cables of equal length are used for all connections The Master generates a synchronization signal at time 0 0 In daisy chain extender mode the Master receives the signal at time O because internal signals paths are used The signal must travel one cable length before it reaches the EX2108 16 The time it takes for the signal to cross the cable is referred as the propagation delay time 1 tpa Devices connected to the TRIGGER PORTS of the expander will experience twice the propagation delay time 2 tpa as the signal must travel through two cables lengths before reaching the devices The more cable lengths that exist between the Master and the devices on the Output Chains the greater the synchronization skew 18 EX2108 16 Basic Operation www vtiinstruments com Synchronization skew is directly proportional to the sum of the cable lengths in a given chain Although the VTI trigger bus cables are designed to minimize propagation delay it is best practice is to use the shortest cables possible when setting up a system VXI Technology Ad Voed ks ee EX Gs le OF e Qu pOr o POWER Master 2t 214 Ot P P TE at 3t terminated At At terminated terminated FIGURE 3 6 DAISY CHAIN EXTENDER MODE In
7. hybrid star daisy chain mode the synchronization skew of the Master Chain differs from the delay times experienced using daisy chain extender mode Figure 3 7 details these delay times Note that the propagation delay times for the Output Chains remain unchanged The Master Chain now experiences the same time delay as the other Output Chains thus eliminating the synchronization skew between the Master Chain and the Output Chains VXI Technology ES ELKE T vo a eg s 25VA MAX Gs o a o 0 iD Gs o E we Ot e a POWER 6 mastif PORT TRIGGRPORT2 TRIGGH PORTA TRIGGER PORTS Master 2 om 2 La 2 toa 3 tpa 3t 3 toa terminated At At terminated terminated FIGURE 3 7 STAR TRIGGER HUB MODE EX2108 16 Basic Operation 19 VTI Instruments Corp When using multiple EX2108 16 modules the propagation delay time between each trigger bus expander creates another variable in system construction The time delay between the two EX2108s is again due to the propagation delay of the cable TRIGGER PORT7 VXI Technology TRIGGER PORT TRIGGERPORT3 TRIGGER PORTS OV la 90 261 VAC al A E il NE Master Ot 2t 2 tpa 1t 3f Sf terminated 4 toa 4 La terminated terminated VXI Technology TRIGGER PORT1 TRIGGER PORT3 TRIGGER PORTS TRIGGER PORT7
8. port will use the upper nibble UN or the lower nibble LN when listening to the trigger bus Note that the MASTER PORT only utilizes the upper nibble To enable the output for a particular nibble move the jumper switch toward the Prxx label To disable the output move the jumper toward the JSn label Og O e 2 2 o0 OD on oo oo oo oo oo H 2 DOOD ODIAN DOOD IMIMIIDINILIN OMITINNIIDOMI III COMIDO IMIUDMIDIDODI i po AE DA Ao ee DOC COL 0 0008 00005 n DO m 1 07 B 3 00 m 0 008 0 70 B ow to D a a n o O n oO O E O A AU WES WIEL UNIE EET Bi AE EEN Gr N GN UL ei Bra OE Br dT EN on nM c um E VLIDLLILAILIULIULTLAULIULIULILTNULAIUCLNE LIU Hn N a DOI UNION IDU DULIULAUULIULIULIUL dT Br ea UL DUI III a n Bac N O D D E D Mo cof of D D B S af m im E n Default settings shown The black rectangles represent jumper placement Master Port Output Port 1 Output Port 2 Output Port 3 Output Port 4 Output Port 5 Output Port 6 Output Port 7 Jumper JS16 JS13 JS14 JS11 JS12 JS9 JS10 JS7 JS8 JS5 JS6 JS3 JS4 JS2 JS1 Mode P7UN P6LN P6UN P5LN P5UN P4LN P4UN P3LN P3UN P2LN P2UN P1LN P1UN POLN POUN Off Off Off Off Off Off Off Off Off Off Off Off Off Off Off Off Lower N A On Off On Off On Off On Off On Off On Off On Off Upper On Off On Off On Off On Off On Off On Off On Off On Both N A On On On On On O
9. 9 VTI trigger bus also apply to the EX2108 16 Each chain is limited to 20 devices per chain The EX2108 can expand the master chain to include seven more chains of up to 20 devices each expanding the test system 160 devices if necessary The EX2116 allows for the addition of fifteen such chains allowing for the creation of a 320 device system Chaining multiple trigger bus expanders together allows for even larger systems to be created covering a larger physical area The EX2108 16 trigger bus ports provide buffering and termination making each port an end point on separate trigger chains This internal termination eliminates the need for end termination blocks on the EX2108 16 External termination blocks however are still required on the terminal devices in a chain see Figure 1 1 While discussing the operation of the EX2108 and EX2116 certain terminology will be used to describe a device s location or connectivity Figure 1 1 provides a topological overview of a multi expander system and provides descriptions for each device EX2108 16 Introduction 9 VTI Instruments Corp Master Chain Terminal Device n devices Oto 18 Output Device Primary Output Chain Terminal Device n devices 0 to 18 Output Device Primary Expander VXI Technology TRIGGER PORT1 TRIGGERPORT3 TRIGGER PORTS 9 O a c a gu 9 mg maste Pon
10. LARATION OF CONFORMITY Declaration of Conformity According to ISO IEC Guide 22 and EN 45014 MANUFACTURER S NAME MANUFACTURER S ADDRESS PRODUCT NAME MODEL NUMBER S PRODUCT OPTIONS PRODUCT CONFIGURATIONS VTI Instruments Corp 2031 Main Street Irvine California 92614 6509 8 16 Port Trigger Bus Expander EX2108 16 All All VTI Instruments Corp declares that the aforementioned product conforms to the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 366 EEC inclusive 93 68 EEC and carries the CE mark accordingly The product has been designed and manufactured according to the following specifications SAFETY EMC EN61010 2001 EN61326 1997 w A1 98 Class A CISPR 22 1997 Class A VCCI April 2000 Class A ICES 003 Class A ANSI C63 4 1992 AS NZS 3548 w A1 amp A2 97 Class A FCC Part 15 Subpart B Class A EN 61010 1 2001 I hereby declare that the aforementioned product has been designed to be in compliance with the relevant sections of the specifications listed above as well as complying with all essential requirements of the Low Voltage Directive February 2007 C OS e i i i A Steve Mauga QA Manager 4 EX2108 16 Preface www vtiinstruments com GENERAL SAFETY INSTRUCTIONS Review the following safety precautions to avoid bodily injury and or damage to the product These precautions must be observed during all phases of operation or service of this
11. STER PORT receives the synchronization signals on the lower four channels of the trigger bus and rebroadcasts the signals on the upper four channels of the Master Port trigger bus only On all the TRIGGER PORTS the signals are rebroadcasts on the lower nibble as they are in the daisy chain extender Incoming MASTER PORT TRIGGER PORTs Transmit Trigger Lower Nibble Ch 0 Ch 3 Lower Nibble Ch 0 Ch 3 Signal Upper Nibble Ch 4 Ch 7 Upper Nibble Ch4 Ch7 gt FIGURE 3 3 HYBRID STAR DAISY CHAIN TRIGGER PROPAGATION An additional setup allows the TRIGGER PORTS to rebroadcast the signals on both the lower and upper four channels simultaneously This configuration grants the software enough flexibility to switch between both modes but consumes the entire trigger bus on all chains 16 EX2108 16 Basic Operation www vtiinstruments com Jumper Switch Configuration Configuration jumper switches allow each port on the EX2108 16 to be set individually Figure 3 4 and Figure 3 5 show the possible configurations Although different modes may be configured for each port all ports typically would have the same configuration The jumper switches on the EX2108 are labeled JS1 through JS15 as shown in Figure 3 4 The jumper is labeled with a Pnxx identifier Pn indicates the port number the jumper will affect where n can take on a value between 0 and 7 inclusive The xx indicates whether the
12. TION Introduction oh oe dene m RR ed ete edet it ins Rear Panel Eayout iii rede titi Routing Mode Configuration Daisy Chain Extender Mode Hybrid Star Daisy chain Mode Jumper Switch Configuration iode ien id ed dedo reed ep tedio Syiiehronizati n SKew due io iet ep m ta e td A tbe ss 2 EX2108 16 Preface www vtiinstruments com CERTIFICATION VTI Instruments Corp VTI certifies that this product met its published specifications at the time of shipment from the factory VTI further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology formerly National Bureau of Standards to the extent allowed by that organization s calibration facility and to the calibration facilities of other International Standards Organization members WARRANTY The product referred to herein is warranted against defects in material and workmanship for a period of one year from the receipt date of the product at customer s facility The sole and exclusive remedy for breach of any warranty concerning these goods shall be repair or replacement of defective parts or a refund of the purchase price to be determined at the option of VTI For warranty service or repair this product must be returned to a VTI Instruments authorized service center The product shall be shipped prepaid to VTI and VTI shall prepay all returns of the product to the buyer However the buyer shall pay a
13. The difference between these modes is seen in the synchronization skew between Master device and the Output device and in EX1629 software setup See the Routing Mode Configuration section in this chapter for more information The two routing modes of the EX2108 16 are manually configurable via internal jumper switches It should only be necessary to manipulate these jumpers during the initial system design It is possible to enable both modes simultaneously but doing so will consume the entire trigger bus See the Jumper Switch Configuration section for more information Daisy Chain Extender Mode One signal routing mode acts as a transparent trigger chain extender In this mode EX1629 software setup need not be modified thus simplifying system expansion The resulting software simplicity however results in a system synchronization performance trade off due to the synchronization skew present between the Master Chain and the Output Chains EX2108 16 Basic Operation 15 VTI Instruments Corp Daisy chain extender mode transmits the master input signals on channels O through 3 or the lower nibble of a TRIGGER PORT The Master Chain does not output buffered versions of the incoming signals unlike in hybrid star daisy chain mode Devices on the Master Chain can respond to the trigger bus signals before the signals are rebroadcast from the EX2108 16 The synchronization skew experienced is dependent on the length of the cable between the Ma
14. asily attached and removed using a Philips screwdriver INPUT CONNECTIONS WIRING The following cables are available through VTI Instruments Corp for use with the EX2108 16 Part Number Description 52 05 15 003 ASSY CABLE LXI TRIGGER BUS INTERCONNECT 0 3M 52 0515 010 ASSY CABLE LXI TRIGGER BUS INTERCONNECT IM 52 0515 015 ASSY CABLE LXI TRIGGER BUS INTERCONNECT 1 5M 52 0515 030 ASSY CABLE LXI TRIGGER BUS INTERCONNECT 3M 52 0515 100 ASSY CABLE LXI TRIGGER BUS INTERCONNECT 10M 52 0515 170 ASSY CABLE LXI TRIGGER BUS INTERCONNECT 17M 52 0515 200 ASSY CABLE LXI TRIGGER BUS INTERCONNECT 20M TABLE 2 1 INTERCONNECT CABLES EX2108 16 Preparation for Use 13 VTI Instruments Corp VTI TRIGGER Bus The following figure provides information for the pin locations and their signals for the EX2108 16 s DB 25 connectors 1 2 8 4 5 6 7 8 9 40 di da 43 14 45 46 47 d8 d9 20 21 2 e 24 25 FIGURE 2 1 TRIGGER BUS DB 25 CONNECTOR 1 4133 V 14 RP TRIG PO 2 GND 15 RP TRIG NO 3 RP TRIG PI 16 RESERVED 4 RP TRIG NI 17 RP TRIG P2 5 GND 18 RP_TRIG_N2 6 RP_TRIG_P3 19 GND 7 RP TRIG N3 20 RP TRIG P4 8 GND 21 RP TRIG N4 9 RP TRIG P5 22 GND 10 RP TRIG N5 23 RP TRIG P6 11 RESERVED 24 RP TRIG N6 12 RP TRIG P7 25 RESERVED 13 RP TRIG N7 i TABLE 2 2 TRIGGER BUS CONNECTOR PIN ASSIGNMENTS
15. expander will see similar trigger arrival times When interconnecting EX2108 16s trigger signals must travel the length of the cable between expanders before retransmission Consideration of this extra length may be required in system construction due to the propagation delay experienced between the devices connected to the separate EX2108 16 expanders Careful analysis and planning of the test system can minimize these effects 12 EX2108 16 Introduction www vtiinstruments com SECTION 2 PREPARATION FOR USE OVERVIEW This section provides information on setting up the EX2108 16 for use It covers hardware installation input connections and trigger port configuration UNPACKING When the EX2108 16 is unpacked from its shipping carton the contents should include the following items EX2108 16 LXI Trigger Bus Expander Power line cord EX2108 16 User s Manual this manual VTI Instruments Corp Drivers and Product Manuals CD All components should be immediately inspected for damage upon receipt INSTALLATION LOCATION The EX2108 16 is designed to be largely insensitive to external electrical magnetic and thermal disturbances The air vents on the sides of the EX2108 16 should not be blocked The EX2108 16 design allows for flexible rack mounting by providing front or rear attachable rack mount brackets The brackets allow optimal positioning of the trigger bus connectors in the rack The rack mount brackets are e
16. ll shipping charges duties and taxes for products returned to VTI from another country VTI warrants that its software and firmware designated by VTI for use with a product will execute its programming when properly installed on that product VTI does not however warrant that the operation of the product or software or firmware will be uninterrupted or error free LIMITATION OF WARRANTY The warranty shall not apply to defects resulting from improper or inadequate maintenance by the buyer buyer supplied products or interfacing unauthorized modification or misuse operation outside the environmental specifications for the product or improper site preparation or maintenance VTI Instruments Corp shall not be liable for injury to property other than the goods themselves Other than the limited warranty stated above VTI Instruments Corp makes no other warranties express or implied with respect to the quality of product beyond the description of the goods on the face of the contract VTI specifically disclaims the implied warranties of merchantability and fitness for a particular purpose RESTRICTED RIGHTS LEGEND Use duplication or disclosure by the Government is subject to restrictions as set forth in subdivision b 3 ii of the Rights in Technical Data and Computer Software clause in DFARS 252 227 7013 VTI Instruments Corp 2031 Main Street Irvine CA 92614 6509 U S A EX2108 16 Preface 3 VTI Instruments Corp DEC
17. n On On On On On On On On FIGURE 3 4 EX2108 JUMPER LOCATIONS amp MODE CONFIGURATION The jumper switches on the EX2116 are labeled JS1 through JS31 as shown in Figure 3 5 The jumper is labeled with a Pnxx identifier Pn indicates the port number the jumper will affect where n can take on a value from 0 to 15 inclusive The xx indicates whether the port will use the upper nibble UN or the lower nibble LN when listening to the trigger bus Note that the MASTER PORT only utilizes the upper nibble To enable the output for a particular nibble move the jumper switch toward the Prxx label To disable the output move the jumper toward the JSn label EX2108 16 Basic Operation 17 VTI Instruments Corp oo MI un op ge Oo 00 E 8 EX 8 E E 8 EX E 8 El 5 E zd Ss E E E E 8 EX E E E E 8 a E S Ss El 3 8 s 8 ii E E E a 8 E E E E 8 z E E E E E 3 E 8 8 id E 3 E E 8 E 8 8 5 a 3 E E E 8 E 8 8 0 00 fa 0 07 Aa 0 70 A Fam Is 0 D n H a Re N ee ee UUNO WU UM A LHL 4 Lig Bog B E l N ID Bac of 9 00 y Bec of 0 00 D A neo TF 4 E 34 Default settings shown The black rectangles represent jumper placement Master Port Output Port 1 Output Port 2 Output Port 3 Output Port 4
18. product Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the product Service should only be performed by qualified personnel TERMS AND SYMBOLS WARNINGS These terms may appear in this manual WARNING Indicates that a procedure or condition may cause bodily injury or death CAUTION Indicates that a procedure or condition could possibly cause damage to equipment or loss of data These symbols may appear on the product ATTENTION Important safety instructions Frame or chassis ground Indicates that the product was manufactured after August 13 2005 This mark is placed in accordance with EN 50419 Marking of electrical and electronic equipment in accordance with Article 11 2 of Directive 2002 96 EC WEEE End of life product can be returned to VTI by obtaining an RMA number Fees for take back and recycling will apply if not prohibited by national law lii Follow these precautions to avoid injury or damage to the product Use Proper Power Cord To avoid hazard only use the power cord specified for this product Use Proper Power Source To avoid electrical overload electric shock or fire hazard do not use a power source that applies other than the specified voltage Use Proper Fuse To avoid fire hazard only use the type and rating fuse specified for this product EX2108 16 Preface 5 VTI Instruments Co
19. rp WARNINGS CONT Avoid Electric Shock Ground the Product Operating Conditions Improper Use AN To avoid electric shock or fire hazard do not operate this product with the covers removed Do not connect or disconnect any cable probes test leads etc while they are connected to a voltage source Remove all power and unplug unit before performing any service Service should only be performed by qualified personnel This product is grounded through the grounding conductor of the power cord To avoid electric shock the grounding conductor must be connected to earth ground To avoid injury electric shock or fire hazard Do not operate in wet or damp conditions Do not operate in an explosive atmosphere Operate or store only in specified temperature range Provide proper clearance for product ventilation to prevent overheating DO NOT operate if any damage to this product is suspected Product should be inspected or serviced only by qualified personnel The operator of this instrument is advised that if the equipment is used in a manner not specified in this manual the protection provided by the equipment may be impaired Conformity is checked by inspection EX2108 16 Preface www vtiinstruments com SUPPORT RESOURCES Support resources for this product are available on the Internet and at VTI Instruments customer support centers VTI Instruments World Headquarters VTI Instruments Co
20. rp 2031 Main Street Irvine CA 92614 6509 Phone 949 955 1894 Fax 949 955 3041 VTI Instruments Cleveland Instrument Division 5425 Warner Road Suite 13 Valley View OH 44125 Phone 216 447 8950 Fax 216 447 8951 VTI Instruments Lake Stevens Instrument Division 3216 Wetmore Avenue Suite 1 Everett WA 98201 Phone 949 955 1894 Fax 949 955 3041 VTI Instruments Pvt Ltd Bangalore Instrument Division 642 80 Feet Road Koramangala IV Block Bangalore 560 034 India Phone 91 80 4040 7900 Phone 91 80 4162 0200 Fax 91 80 4170 0200 Technical Support Phone 949 955 1894 Fax 949 955 3041 E mail support vtiinstruments com Visit http www vtiinstruments com for worldwide support sites and service plan information EX2108 16 Preface 7 VTI Instruments Corp 8 EX2108 16 Preface www vtiinstruments com SECTION 1 INTRODUCTION OVERVIEW The EX2108 and EX2116 provide 8 and 16 port VTI trigger bus expansion respectively for use with the EX1629 strain gage measurement system As the trigger bus expanders share similar functionality they will be referred to as EX2108 16 when similarities are discussed The EX2108 16 allows multiple trigger bus chains to expand from a single master chain providing the capability to create larger channel count systems while still maintaining measurement synchronization The physical constraints of the EX162
21. ster and the EX2108 16 This may or may not affect the measurement system depending on the synchronization requirements Incoming MASTER PORT TRIGGER PORTs Transmit eg Lower Nibble Ch 0 Ch3 Lower Nibble Ch 0 Ch3 Upper Nibble Ch 4 Ch 7 Upper Nibble Ch 4 Ch 7 FIGURE 3 2 DAISY CHAIN EXTENDER TRIGGER PROPAGATION Hybrid Star Daisy chain Mode The second signal routing mode acts a star trigger bus hub This mode eliminates the synchronization skew created in the daisy chain extender mode by providing a loopback to the Master Chain This routing mode allows the Master Chain to use the loopback signals from the EX2108 16 instead of the original Master synchronization signals In this mode the master loopback signals have the same synchronization skew as the other Output Port signals resulting in a low synchronization skew between the chains In the hybrid star daisy chain mode the master input signals are rebroadcast on channels 4 through 7 or the upper nibble of both the MASTER PORT and the TRIGGER PORTS The MASTER PORT receives signals on the lower four channels This mode requires the EX1629s software to be modified to allow the master signals to loopback into the Master Chain devices on different channels than they originate A modified version of the hybrid star daisy chain routing mode reduces the necessary software changes to only the Master Chain In this version the MA
22. t T Tmien PORTA Secondary Expander VXI Technology TRIGGER PORT1 TRIGGER PORTS TRIGGER PORTS ef le euo ofer efe SEO suse mE T TRIGGER PORT7 90 264 VAC 50 60 Hz O SET O 25VA MAX Qus POWER TRIGGER PORTS 50 60 Hz TRIGGER PORT7 90 261 VAC 25VA MAX lex 9 POWER c 7 PORTS Output Device Terminal Device Output Device n devices 0to 18 Terminal Device Secondary Output Chains n devices 0 to 18 Terminal Device FIGURE 1 1 EX2108 16 SYSTEM TERMINOLOGY 10 EX2108 16 Introduction www vtiinstruments com EX2108 16 SPECIFICATIONS GENERAL SPECIFICATIONS NUMBER OF PORTS EX2108 8 VTI trigger bus ports EX2116 16 VTI trigger bus ports OPERATING TEMPERATURE 0 C to 50 C TRIGGER CHANNEL BANDWIDTH 100 MHz POWER INPUT 90 264 V ac 50 60 Hz 25 VA maximum DEVICES PER CHAIN 20 maximum MAXIMUM CHAIN LENGTH 20m DIMENSIONS 1 75 Hx 17 5 W x 14 4 D EX2108 16 Introduction 11 VTI Instruments Corp MAXIMIZING MEASUREMENT PERFORMANCE Multi Expander Test Systems Creating multi expander test systems requires accounting for the synchronization skew between EX2108 16s The EX2108 16 retransmits the trigger signals with a low synchronization skew between ports such that devices placed an equal distance from the
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