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SpectraVideo Camera User’s Manual 

 

Software Development 

29 

11.  S

OFTWARE 

D

EVELOPMENT

 

11.1. S

PECTRA

V

IDEO 

S

ERIAL 

P

ORT 

I

NTERFACE

 

The SpectraVideo camera uses a serial interface to control some of the operation 
modes  and  timing  parameters  involved  in  image  acquisition.  A  digital  signal 
processor  (DSP)  which  incorporates  a  serial  port  controls  timing  in  the  camera. 
Mode  control  and  internal  counters  are  set  through  this  port.  Serial 
communications to the SpectraVideo camera, which uses the PCI data acquisition 
board  without the  fiber optic  link,  is through the PC’s RS-232 (COM)  port. The 
port must be  set up  to use 9600  baud, 1 stop  bit, 8 data bits  and  no  parity.  This 
section  of  the  manual  covers  serial  communication  to those  cameras  that  do  not 
use  the  serial  interface  board  and  fiber  optic  link  to  the  PCI  data  acquisition 
board.  Additional  commands  are  required  for  the  serial  interface  board  /  fiber 
optic link. 

Comm settings: 

9600 Baud 

1 stop bit 

8 data bits 

No parity 

 

There are two types of commands: reboot commands and data commands. Reboot 
commands  consist  of  a  single  character  (byte).  Data  commands  are  three 
characters  sent  without  pause  between  them;  first  is  the  control  character  to  tell 
the  DSP  which  function  is  being  accessed,  and  the  second  two  are  combined  to 
form  an  integer.  The  port  can  be  tested  by  sending  single  characters  using  a 
simple  terminal  emulator  program,  but  typically  these  simple  programs  do  not 
send characters quickly enough in succession to be able to address any of the data 
commands.  Data  command  interpretation  in  the  DSP  is  timed  to  look  for  the 
second and third bytes at a particular rate and if no data is present it will read the 
hexadecimal  numbers 0xFF, 0xFF and  interpret them as  the hexadecimal  integer 
0xFFFF.  

Data command 

syntax: 

Control character 

Data high byte 

Data low byte 

 

After  every  three-character  command  sequence,  the  DSP  will  respond  over  the 
serial port by sending back the three characters it received. If the control character 
is  not  recognized,  it will also  send  back the  ASCII character ‘?’. This  feature  is 
useful  for  determining  whether  the  DSP  is  responding  to  serial  port  commands. 
With fiber optic links, an ACK is not returned if an invalid command sequence is 
sent. 

There is an eight-page PROM in the camera that contains the DSP code. The DSP 
is booted from PROM page 0 on power-up. Although the same basic DSP code is 
used in all eight PROM pages, the actual timing sequences in each page differs to 
accommodate  the  different  clock  timing  patterns  required  for  different  CCD 

Содержание SPECTRAVIDEO

Страница 1: ...2 00 Rev C SPECTRAVIDEO CAMERA USER S MANUAL DOCUMENT CHANGE NOTICE REV DATE DCN ORIGINATOR SUMMARY OF CHANGES A 2 8 98 n a T Nebeker Original Document B 4 15 99 n a T Nebeker Updates Edits C 2 15 00...

Страница 2: ...SPECTRAVIDEO CAMERA USER S MANUAL...

Страница 3: ...ed to PixelVision Inc for replacement or repair it must be packed in its original material as it was shipped to you The limited warranty may be voided if the camera is not returned in its original pac...

Страница 4: ...EW 12 5 2 ANALOG SIGNAL PROCESSING BOARD CONNECTIONS 12 5 2 1 GAIN SELECTION 12 5 2 2 ANALOG OUTPUT 13 5 2 3 BOARD TO BOARD SIGNAL CONNECTIONS 14 5 2 4 DIGITAL INPUT OUTPUT 15 5 2 5 RS232 INPUT 15 6 D...

Страница 5: ...ROI IMPLEMENTATION 30 11 1 3 COMMAND SUMMARY 31 12 SUPPORTING SOFTWARE 34 12 1 COMMTEST SOFTWARE USER S GUIDE 34 12 2 PIXLOAD SERIAL PORT CONTROL SOFTWARE 35 12 2 1 TEXT FILE FORMAT 35 12 2 2 SAMPLE T...

Страница 6: ...nt illuminated CCDs by illuminating and collecting charge through the back surface away from the polysilicon gate electrodes on the front surface The image photons enter the CCD back surface unobstruc...

Страница 7: ...0000000000000000000000000000 0000000000000000000000000000000000000000000000 PixelView Software for Windows 3 1x 95 98 or NT Data Cable 00000000000000000000000000000000000 00000000000000000000000000000...

Страница 8: ...where images and graphics are associated with windows The Shortcut Key feature a combination of mouse drags and key pushes makes graphics and analysis just a touch away Some of the most commonly used...

Страница 9: ...higher clock speeds will not acquire images faster than the rate determined by the camera however as bus and microprocessor clock speeds improve the efficiency in which the computer handles backgroun...

Страница 10: ...on this supply voltage pin A damaged fuse on a PCI board can cause a serial port command upload failure error message Please save all packing material If the camera must be returned to PixelVision In...

Страница 11: ...from the port on the back of the camera control box marked serial control to a free serial COM port on your PC Note which serial COM port you are using for setup of PixelView Then connect the paralle...

Страница 12: ...he disk label PCI Driver Disk into your 3 floppy drive select that drive and click OK Follow any instructions Windows 95 presents Some PC systems may prompt you for a file name or directory in the Cop...

Страница 13: ...Cable Interface The camera head is provided with a Nikon lens mount standard A C mount or Canon lens mount is optional A inch 20 tpi mounting hole is provided in the camera head For specific informat...

Страница 14: ...or Low app 9 e ADU Binning and Region of Interest ROI Binning and ROI is software selectable in X and Y coordinates Cooling Capacity 2 stage TE Vacuum Module 45 60 C from ambient 3 stage TE O ring De...

Страница 15: ...me must then be acquired The software will wait until an exposure has occurred and will capture the frame Pressing the Escape key will cancel the acquisition Once a single frame has been acquired sele...

Страница 16: ...ARE TRIGGERED EXPOSURE CONTROL To use software triggered exposure control the connector on the camera control box labeled Exposure Out must be looped back to the connector labeled Exposure In A short...

Страница 17: ...des noise immunity from the PC Figure 4 SpectraVideo Analog Processing Board Layout One of two gain settings can be selected on the analog signal processing board A buffered analog output is also avai...

Страница 18: ...by the PixelView software package NOTE If you are running a two speed camera the HIGH gain setting is used for high speed operation and the LOW gain is used for low speed operation 5 2 2 ANALOG OUTPUT...

Страница 19: ...signal processing for noise reduction and data conversion J1 pin Function J1 pin Function 1 15Vdc 2 Sample Hold 1 3 GND 4 Start Convert 5 5Vdc 6 Output Enable 7 15Vdc 8 Sample Hold2 9 GND 10 Expo_Gate...

Страница 20: ...3 27 Data 11 28 n c 29 GND 30 n c 31 Data 12 32 n c 33 Data 13 34 n c 35 Data 14 36 5V from PC 37 Data 15 MSB 38 TTL in 39 Serial clock 40 TTL out Table 5 PMB 003 Data I O Connector 5 2 5 RS232 INPUT...

Страница 21: ...pectraVideo Camera User s Manual Analog Signal Processing Board 16 J4 pin Function J4 pin Function 1 NC 2 nc 3 RS232 input 4 nc 5 RS232 output 6 nc 7 NC 8 nc 9 GND 10 nc Table 6 PMB 003 RS232 Connecto...

Страница 22: ...basic modes flush exposure after exposure and readout During the flush mode the CCD is cleared as quickly as possible and the data is not transferred to the PC Exposure mode is entered from the flush...

Страница 23: ...re delay and then low during the readout In this way the I O channel to the PC can sense the internal exposure gate timing EG Exposure Gate DV Data Valid LB Line Blanking FB Frame Blanking Figure 6 Ca...

Страница 24: ...readout occurs with the data valid strobe active The readout may not be interrupted except by DSP reset The rising edge of the data valid strobe occurs after valid data appears on the data bus There i...

Страница 25: ...Function J2 Pin Function 1 15V 2 DSP reset 3 GND 4 Shutter 5 5V 6 Aux dat 1 7 15V 8 Aux dat 2 9 GND 10 Aux dat 3 11 GND 12 Aux dat 4 13 GND 14 Aux dat 5 15 GND 16 Aux dat 6 17 Clockout 18 Aux dat 7 19...

Страница 26: ...J6 Pin Function J6 Pin Function 1 GND 2 SWout 3 GND 4 S1out 5 GND 6 S2out 7 GND 8 S3out 9 GND 10 Reset Logic 11 GND 12 P1out 13 GND 14 P2out 15 GND 16 P3out 17 GND 18 Tgout 19 Reset gate High rail vo...

Страница 27: ...mploys a Lattice ispLSI 2032 In System programmable PLD as a service controller It provides 4 channel serial transmitter control clock divider violation control A transparent AMD TAXI transmitter Am79...

Страница 28: ...s can be used to provide an input signal to the board They all share the same 16 bit bus Additional write enable signals are provided by the Digital Control Board to latch every channel in its own lat...

Страница 29: ...s open and 5V otherwise PixelView uses two constants called TempGain and TempOffset These values are used to convert a temperature to a binary value to send after the x command TempOffset Kelvin _ in...

Страница 30: ...to two kilometers away 9 1 2 GENERAL DESCRIPTION Specifically designed for use with digital camera systems the LynxPCI data acquisition board captures and stores the parallel or serial data from digit...

Страница 31: ...LynxPCI uses doubled FIFO or dual port memory buffers LynxPCI writes incoming data into one memory buffer while another is read by the PCI controller guaranteeing uninterrupted data acquisition The L...

Страница 32: ...mory Map POWER 5VDC 3A max MTBF 30 000 hrs OPERATING TEMPERATURE 0 70 Degrees Celsius non condensing STORAGE TEMPERATURE 20 to 85 Degrees Celsius FO Tx Tx FO Rx Rx LSB Rx MSB Switch FIFO 4Kx16 FIFO 4K...

Страница 33: ...board and the CCD socket boards are connected as shown in Table 12 Digital Control Board to Analog Signal Processing Board J3 J1 pin 1 to pin 1 Digital Control Board to Socket Board J6 J1 J2 J6 pin 1...

Страница 34: ...control character to tell the DSP which function is being accessed and the second two are combined to form an integer The port can be tested by sending single characters using a simple terminal emulat...

Страница 35: ...ual clock period of a particular camera may be found on the data sheet and in the registry or pixview ini shipped with the camera 11 1 1 REBOOT COMMANDS Control Character ASCII Function Discussion 0 t...

Страница 36: ...e lead in pixels in the imager as well as the active pixels If serial binning is used this number may be divided by the number of serial pixels binned but the extra 4 pixels for pipeline delay must st...

Страница 37: ...close or phosphor to decay etc The serial register of the CCD is kept flushed during this period The wait time is set to AfterExposureWait squared times the unbinned serial pixel period Min 1 i ROI en...

Страница 38: ...above Minimum MiddleLoopCounter 1 w Internal timer outer loop counter See discussion for t above Minimum OuterLoopCounter 1 x CCD Temperature See discussion in the Shutter and Cooler control board se...

Страница 39: ...r button clears the response space in the window The Send button works the same as a carriage return if the Send button is highlighted The RS232 lines are optically isolated on the analog board before...

Страница 40: ...must conform to the DOS filename format The text file format must conform to the rules described in this section for the DSP commands to be sent appropriately PixLoad depends on the text file to be le...

Страница 41: ...e to a hexadecimal format used by the DSP See Section 11 1 on the SpectraVideo serial port interface for details on the serial port command syntax 12 2 2 SAMPLE TEXT FILE The following is a sample lis...

Страница 42: ...1024 unblanked lines in region of interest r 0 lines skipped after region of interest s 0 1 internal 0 external exposure control t 1000 internal exposure counter inner loop v 1 internal exposure count...

Страница 43: ...SpectraVideo Camera User s Manual Appendices 38 13 APPENDICES 13 1 APPENDIX A 13 1 1 HEAD ASSEMBLY MECHANICAL DRAWING Head Assembly Mechanical Specifications Weight 2 5 lbs...

Страница 44: ...SpectraVideo Camera User s Manual Appendices 39 13 2 APPENDIX B 13 2 1 CAMERA CONTROL BOX MECHANICAL DRAWING Camera Control Box Mechanical Specifications Weight 7 0 lbs...

Страница 45: ...ile requires the user host to do some calculations based on constants associated with the camera These constants are in pixview ini or are listed on a separate data sheet sent with the camera prom pag...

Страница 46: ...Interest mode switch 0 no region of interest roi 1 1 roi n n ROIs with n rods see discussion at B a number pixels per row line lead in pixels central array pixels 2 This is the number of pixels per ro...

Страница 47: ...minus 1 pixels group size c 1 e 20 serial wait count pixel period baseNumSerialStates e 3 masterClock Some proms have fixed serial timing f 60 parallel wait count parallel shift state period f 4 mast...

Страница 48: ...period of each line The PCI I O board blanks the first LB pulse since data is not meaningful until after the first line is written to line buffer An additional line must be read from CCD so that that...

Страница 49: ...al Signal Processor The integrated circuit used to generate the logic for the CCD clocking sequence Lead in pixels Lead in pixels are extra pixels in the serial register between the imaging array and...

Страница 50: ...em reboot Quantum efficiency Photon to electron conversion efficiency in the CCD ROA Region Of Analysis ROI Region Of Interest Only those pixels in the ROI are digitized during CCD readout when ROI is...

Страница 51: ...External Exposure Control 10 F Flush Mode 18 Frame Blank Pulse 18 G Gain Selection 12 Gain Signal Chain 12 General Specifications 9 I Installing Data Acquisition Board 6 Internal Exposure Control 11...

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