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18

CA-D6-xxxxW User’s Manual

03-32-00225-06

DALSA INC.

2.8 Multi-Camera Operation

Camera Multiplexing

Camera multiplexing puts multiple cameras on the same data bus. All the
multiplexed cameras are spliced into the same data cable; this is possible because
the camera’s output line drivers can be tri-stated. The usual control signals can be
spliced on a single cable, but they can also be kept separate for each camera. The
cameras do not require synchronized control signals because only one camera
can be active at any one time—a camera becomes active when you supply it with
a differential USR_EN signal. Each multiplexed camera must receive its own
USR_EN signal from a separate differential pair from a EIA-644 line driver.

USR_EN in logic HIGH activates camera
output. USR_EN in logic LOW puts
outputs in tri-state. Note that toggling
the camera outputs from tri-state to
active requires a small but important
amount of setup and hold time. Be sure to take this time into account when
configuring your system.

max.39 ns

max. 50 ns

USR_EN
Data

Содержание MotionVision CA-D6-0256W-ECEW

Страница 1: ...MotionVision CA D6 xxxxW High Speed Area Scan Cameras Camera User s Manual 03 32 00225 rev 06 Printed 03 18 99 10 00 AM ...

Страница 2: ...s are used worldwide in document scanning image capture surveillance process monitoring and manufacturing inspection DALSA also develops customized products for specific customers and applications All DALSA products are manufactured using the latest state of the art equipment to ensure product reliability All electronic modules and cameras are subjected to a 24 hour burn in test For further inform...

Страница 3: ...tallation Overview 9 2 2 Input Output 9 2 3 Connectors Pinouts and Cables 10 2 4 Power Supplies 11 2 5 User Bus Inputs 12 2 6 Data Bus 15 2 7 Timing 16 2 8 Multi Camera Operation 18 3 0 Optical and Mechanical Considerations 19 3 1 Mechanical Interface 19 3 2 Optical Interface 20 3 3 EMC Operation 23 4 0 Troubleshooting 25 4 1 Common Solutions 25 4 2 Specific Solutions 27 4 3 Product Support 29 App...

Страница 4: ...4 CA D6 xxxxW User s Manual 03 32 00225 06 DALSA INC ...

Страница 5: ...ras use DALSA s patented modular architecture This system of connecting circuit modules through standardized busses allows DALSA to build a high performance modular camera using the reliability flexibility and cost effectiveness of high volume interchangeable parts Within the camera a timing board PB D6 X205 generates all internal timing and a driver board PB D6 A198 provides bias voltages and clo...

Страница 6: ... Registers Note All readout shift registers have the same clocks and output structure as OS1 6I OS2 6I OS3 6I OS4 260 Columns or 532 Columns 269 Rows or 525 Rows VPS VPS VPS CRLAST Figure 2 CA D6 Camera Spectral Response R esp o n siv ity D N n J c m 2 W avelength nm 0 0 2 1000 800 600 400 500 700 900 0 4 0 6 0 8 1 4 1 2 1 0 Responsivity ...

Страница 7: ...Dynamic Range ratio 325 1 540 1 Supply Current 256 512 15 0 V mA 300 350 350 400 5 0 V mA 900 1200 950 1300 4 5 0 V mA 1000 1300 1050 1400 5 5 0 V mA 200 230 250 280 Operating Temperature C 0 50 Notes DN digital numbers also known as levels 0 255 for 8 bit systems All cameras use sensor grade 01 Other grades also available Contact DALSA for information 1 DC light source bulb color temp 3150K 750nm...

Страница 8: ...ber of electrons a pixel can hold without spilling charge onto adjacent pixels As light energy hits an array of pixels the pixels collect charge At certain intervals a frame transfer sensor such as the IA D6 transfers its collected charge from the active photosensitive region to a light shielded storage region Then it transfers the charge line by line to one or more readout registers which feed ea...

Страница 9: ...ese steps 1 Decide on modes of operation will you use USR_EN 2 Test and connect power supplies 3 Test and connect User Bus control signals from framegrabber 4 Test and connect data signals output from camera You must also set up the other components of your system including light sources framegrabbers camera mounts heat sinks host computers optics and so on 2 2 Input Output ...

Страница 10: ...e lists both The signals are located on the same physical pins in both cases but the STROBE pin is numbered 37 under the crimp convention and 13 under the solder convention Crimp Label Solder Label Signal Crimp Label Solder Label Signal Crimp Label Solder Label Signal 1 1 OSBD7 3 18 OS2D6 2 34 OS2D7B 4 2 OS2D6B 6 19 OS2D5B 5 35 OS2D5 7 3 OS2D4 9 20 OS2D3 8 36 OS2D4B 10 4 OS2D3B 12 21 OS2D2B 11 37 ...

Страница 11: ...e use 14 future use 7 not used 15 not used 8 not used 2 4 Power Supplies See section 1 3 for power requirements When setting up the camera s power supplies follow these guidelines Do not use the shield on a multi conductor cable for ground Connect separate supplies at the source and at the camera Use separate leads for better noise immunity The companies listed below make power supplies that meet ...

Страница 12: ...n this mode its frequency determines the camera s frame rate FVAL frequency The delay between the falling edge of EXSYNC and the first valid pixel varies with model and is shown on the timing diagram section 2 9 Minimum EXSYNC high or low time 100 ns DB15 Pins EXSYNC 12 EXSYNCB 4 Note Restricting EXSYNC to logic HIGH prevents frame readout PRIN Controls Electronic Shuttering PRIN is an optional si...

Страница 13: ... defined as the time from the end of one frame transport to the beginning of the next frame transport Figure 3 Free Run Mode frame transport frame readout frame transport frame readout EXSYNC MODE PRIN exposure time Figure 4 depicts the operation of the camera when the EXSYNC signal frequency is user controlled The frame rate is variable and depends solely on the EXSYNC rate Keeping PRIN high maxi...

Страница 14: ...g frame readout Figure 5 User Controlled EXSYNC and PRIN frame transport frame readout frame transport EXSYNC MODE PRIN exposure time frame readout For snapshot operation see Figure 6 you can use a combination of EXSYNC and PRIN to trigger image capture from external event The CA D6 can remain in a wait state until it receives a combination of EXSYNC and PRIN During the wait state the EXSYNC and P...

Страница 15: ... To help clock digital data into framegrabbers the camera outputs clocking signals STROBE LVAL and FVAL STROBE STROBE is a pixel clock signal for digital data It is continuous toggling even when data is not valid Digital data is valid on its rising edge with LVAL and FVAL high LVAL LVAL high with FVAL high indicates the camera is outputting a valid line of pixels Between valid lines within a frame...

Страница 16: ...ock digital data is valid on its rising edge After a frame is read out the FVAL signal goes low and the sensor collects charge for the next frame Figure 7 CA D6 xxxxW Overall Timing LINE 1 LAST LINE EXSYNC LVA L FVAL 1 2 5 3 6 8 7 N 4 3N 4 N 2 N N 4 1 N 2 1 3N 4 1 1 STRO BE O S1 O S3 O S2 O S4 N OTES rising edge 0256 0512 Position of the first valid pixel valid on the of STRO BE D im ensions of si...

Страница 17: ...25 06 Figure 8 CA D6 xxxxW Detailed Timing Symbol Description Min Typ Max Unit TLSW LVAL to STROBE 2 0 2 ns TLSZW LVAL to STROBE 2 0 2 ns TSETUP Data setup 18 23 28 ns THOLD Data hold 12 17 22 ns TPL PRIN pulse 5 5 6 5 7 5 µs TEL EXSYNC pulse 100 ns ...

Страница 18: ...e cameras do not require synchronized control signals because only one camera can be active at any one time a camera becomes active when you supply it with a differential USR_EN signal Each multiplexed camera must receive its own USR_EN signal from a separate differential pair from a EIA 644 line driver USR_EN in logic HIGH activates camera output USR_EN in logic LOW puts outputs in tri state Note...

Страница 19: ...its front plate There are four M4 holes and seven 4 40 UNC holes tapped into the front plate for mounting the camera or attaching heat sinking Other mounting options include M4 holes on the sides of the camera stability increases with number of sides used and the tripod mount least stable Environment The camera and cables should be shielded from environmental noise sources for best operation The c...

Страница 20: ...ngths of light required to capture useful images depend on the particular application Factors include the nature speed and spectral characteristics of objects being imaged exposure times light source characteristics environmental and acquisition system specifics and more DALSA s current Databook provides an introduction to this potentially complicated issue See 4 Radiometry and Photo Responsivity ...

Страница 21: ...es not include a mounting ring and the CORION HR 750 series hot mirror Lens Modeling Any lens surrounded by air can be modeled for camera purposes using three primary points the first and second principal points and the second focal point The primary points for a lens should be available from the lens data sheet or from the lens manufacturer Primed quantities denote characteristics of the image si...

Страница 22: ... can be combined to give their most useful form h h f OD This is the governing equation for many object and image plane parameters Example An acquisition system has a 512 x 512 element 10 µm pixel pitch area scan camera a lens with an effective focal length of 45 mm and requires that 100µm in the object space correspond to each pixel in the image sensor Using the preceding equation the object dist...

Страница 23: ...us 3M 3750 9 6 1 8m shielded jacketed twisted pair Power 18 AWG Data Bus 3M 3750 50 6 1 8m shielded jacketed twisted pair Data Bus 3M 3750 50 6 1 8m shielded jacketed twisted pair Follow these specific guidelines to maximize compliance in your application Keep control and data cables as short as possible Control and data cables must have 95 coverage shields that include braided wire Metallic foil ...

Страница 24: ...24 CA D6 xxxxW User s Manual 03 32 00225 06 DALSA INC ...

Страница 25: ...and specific solutions listed in sections 4 1 and 4 2 3 If these solutions do not resolve your problem see section 4 3 on getting product support 4 1 Common Solutions Connections The first step in troubleshooting is to verify that your camera has all the correct connections Follow the troubleshooting flowchart shown in Figure 10 Power Supply Voltages Check for the presence of all analog and digita...

Страница 26: ...ignal present Are LVAL STROBE signals present FVAL Complete the table in the Product Support section and contact your DALSA representative Does each digital data bit toggle and are there continuous STROBE clocks Scope the digital video Under varying illumination trigger from LVAL while looking at each individual digital bit No No Yes Yes Yes Yes Yes No No No START Check setup see Chapter 2 ...

Страница 27: ...ht is blocked from the camera lens If any of the above signals are missing contact DALSA product support 4 2 Specific Solutions No Output or Erratic Behavior If your camera provides no output or behaves erratically it may be picking up random noise from long cables acting as antennae Do not attach wires to unused pins Verify that the camera is not receiving spurious MCLK or USR_EN inputs Noisy Out...

Страница 28: ...4 using a clean tissue until the entire window has been cleaned 8 Blow off any adhering fibers or particles using dry filtered compressed air Stuck Bits If data bits seem to be stuck or do not change check that the camera is not saturated by preventing light from entering Next disconnect the digital cable from the camera Check the digital signals at the output of the camera ensuring that the corre...

Страница 29: ...l Number Your DALSA Agent or Dealer Acquisition System hardware framegrabber host computer light sources etc Acquisition System software version OS etc Power supplies and current draw Data rate used Control signals used in your application and their frequency or state if applicable EXSYNC BIN MCLK Other _______ PRIN Detailed description of problem encountered please attach description with as much...

Страница 30: ...30 CA D6 xxxxW User s Manual 03 32 00225 06 DALSA INC ...

Страница 31: ...e standard requires that two wires e g twisted pair be used to transmit one signal in a differential mode This means that one wire will be logic HIGH while the other wire is logic LOW Voltage swing between HIGH and LOW is approximately 350mV with a typical offset of approximately 1 25V The use of differential signal transmission allows the receiver to reject common mode voltages This noise rejecti...

Страница 32: ...e sense as the TTL signal which is sent or received i e when MCLK in the TTL domain is HIGH then MCLK in the EIA 644 domain is HIGH The signal has the opposite sense of the TTL domain signal and so if MCLK TTL is HIGH then MCLKB EIA 644 is LOW Figure 11 shows the relationship Figure 11 EIA 644 Example Unused EIA 644 Inputs and Outputs Unused outputs should be left unconnected This will reduce powe...

Страница 33: ...ic camera behavior Cable Lengths Figure 12 shows a graph of ideal communication data rate vs cable length for the EIA 644 standard Figure 12 EIA 644 Data Rate vs Cable Length Cable Length m Data Rate Mbps 1 1 1000 100 10 2 3 5 10 20 Jitter Measured at 0100mV Differential 20 Jitter Measured at 0V Differential CAT3 Cable Typical Data Rate vs Cable Length National DS90C031 ...

Страница 34: ...34 CA D6 xxxxW User s Manual 03 32 00225 06 DALSA INC ...

Страница 35: ...W ECEW CA D6 0512W ECEW meets the test limits for Electrostatic Discharge IEC 1000 4 2 1995 Radiated Immunity IEC 1000 4 3 1995 Burst ELF Class III IEC 1000 4 4 1995 Radiated Emissions CISPR 22 and therefore correspond s to the regulations of the EU Directive 89 336 EEC Place of Issue Waterloo ON CANADA Date of Issue 18 November 1997 Name and Signature of authorized person Brian Doody Vice Preside...

Страница 36: ...36 CA D6 xxxxW User s Manual 03 32 00225 06 DALSA INC ...

Страница 37: ...ark patches 27 Data Bus 15 Digital Data 15 DN digital numbers 7 driver board 5 E EMC compliance 5 23 EMC Declaration of Conformity 35 EMC Operation 23 environmental considerations 19 Event Triggered Image Capture 15 EXSYNC 12 troubleshooting 25 F fiber optic light sources 21 fill factor 5 Filters 21 free run mode 13 full well capacity 8 FVAL 15 H halogen light sources 21 hot mirror 21 how CCD imag...

Страница 38: ...exing camera 18 N noisy output 27 O optical interface 20 P performance specifications 7 photosensitive elements pixels 8 pinout DB25 User Bus 10 OS1 data 10 pixels and resolution 5 power supplies 11 PRIN 12 R RS422 reference 31 S shuttering electronic PRIN 12 snapshot operation 15 state diagrams 16 STROBE 15 troubleshooting 27 stuck bits 28 T Technical Sales Support 29 temperature 19 Timing 16 tim...

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