Far Ultraviolet SpectroPolarimeter (FUSP)

Transcription

1 Far Ultraviolet SpectroPolarimeter (FUSP) Telemetry, Commands, and Electrical Interface Specification 1100-S-0000 Revision B Nov 2, 1999 Vehicle UG Prepared for: National Aeronautics and Space Administration Wallops Flight Facility Wallops Island, Virginia Prepared by: D. Michalski K. Nordsieck Space Astronomy Laboratory University of Wisconsin Madison, Wisconsin 53706

2 FUSP Interface 1100-S-0000 Rev B, Nov 2, 1999 i Change History Rev Date Description A 2 Dec, 1998 Original. Markup from WISP B 2 Nov, 1999 Design Review; delete markup; rename connectors per Wallops; add ST3; add fiberoptic 2 MHz umbilical

3 FUSP Interface 1100-S-0000 Rev B, Nov 2, Telemetry The telemetry interface will be compatible with the Vector Pulse Code Modulation (PCM) telemetry system used on sounding rockets. The purpose of this system is to transmit CCD images and engineering data from the WISP. The science data rates are 1 pixel (15 bits) every 22.5 :sec, so that a high rate PCM system is required. The payload will transmit a NRZ-L 2 pole filtered data stream at a continuous 2 MHz rate to the TM section. The clock is generated within the payload. Clock accuracy and stability are TBD. The data is arranged in packets, or frames. There are 10 words per science data frame. Each word is 9 bits wide. Each frame contains a fixed pattern 10 bit sync word, a 10 bit CCD line counter, a 10 bit telemetry frame counter, a 3 bit ID that indicates the type of data being sent, and 6 data bytes. (Parity is not transmitted during sync word, i.e., the PCM receiver will see the recommended 10 bit sync word as given in the PCM Handbook, NASA publication 1171 Table 19.) The data frame will have the following format: Science Data Frame (SDF) (Sync) P Line Cnt(7) 0 (Sync) P Science Data (MS byte Pixel A) P Science Data (LS byte Pixel A) P P Engineering Data Engineering Data Note: Parity (P) is odd and is transmitted last. Frame period is 45 :sec. P Science Data (MS byte Pixel B) P Science Data (LS byte Pixel B) P SDF Cnt(5) Line Cnt(3) P SDB(1) SDA(1) ED(1) SDF Cnt(5) Data is shifted out to the right MSB first, starting with Sync. ED, SDA, SDB are ID status bits indicating, if "1", data in frame. The ground station(s) will record the data on tape and provide a CDROM following the launch. During the test, pre-launch, and launch phases, the experiment GSE will receive a NRZ-L serial data stream, TTL compatible, along with a reconstructed 2 MHz clock from the PCM receiver. The science data will be transmitted in real time via the high speed PCM data link at a rate of 2 Megabits per second. Clock duty cycle shall be 50%. The data will change on the rising edge of the zero degree clock; the experimenter will sample the data line on the falling edge of the clock. The signal levels shall be TTL compatible fed over 50 ohm coax with the experimenter terminating the lines in 50 1

4 FUSP Interface 1100-S-0000 Rev B, Nov 2, ohms. The ground station(s) must record data from T-30 seconds to the end. 2. Commands The experiment will require 1 digital command from the TM/ACS section. These signals shall be open circuit switch closures to experiment signal ground at the time of function activation. Open circuit voltage shall be +5 volts and the TM section must sink 5 ma with no more than 0.2 volts drop with respect to experiment signal ground. 2.1 On Target When the ACS has acquired fine mode on the science target the ACS shall issue an "On Target" signal to the experiment. 3. Power and Grounding The experiment shall require a nominal +28 volts. Peak voltage shall not exceed +35 volts at any time. Minimum voltage shall be greater than +21 volts. Power will be 150 watts, average; 200 watts, peak. Experiment power shall be removed prior to chute opening. Primary power return will be isolated from experiment signal ground within the experiment by at least 1 Megohm in parallel with.05 :fd. Both returns are isolated from chassis by at least 1 Megohm in parallel with.05 :fd. Primary return and signal return are connected to chassis within the TM section at a single point. Experiment DC-DC converters shall be of the linear regulated type in order to minimize EMI. 4. Connectors FUSP interface connectors closely mathc connectors defined for WISP (last flight ), but have been renamed for FUSP as follows: Connectors WISP (36.172) FUSP (36.173) Power/ Telemetry P400 P940 Analog Telemetry J401 J941 Ball Tracker (ST1) J142 J712A Experiment Sensor (ST2) P142A P716 Ignitor Housing P5 P757 Door P750 P Telemetry The experiment shall have two bayonet style connectors on its baseplate. These connectors are labeled P940 and J941. P940 is a Bendix PT07SE-22-55P. J941 is a Bendix PT07SE-22-55S. 2

5 FUSP Interface 1100-S-0000 Rev B, Nov 2, Experiment interface assignments for P940 and J401 are listed below: All optically isolated signals are to be made available at the TM umbilical so that these can be fed to the experiment GSE in the block house. P940: PT07SE-22-55P Pin Assignment Notes P940-A +28V Expt +28V P940-B +28V Expt +28V P940-C +28V Expt +28V P940-D +28V Expt +28V P940-E +28V Rtn +28V return P940-F +28V Rtn +28V return P940-G +28V Rtn +28V return P940-H +28V Rtn +28V return P940-J Expt Reset Opto isolated expt reset Hi Side P940-K Reset Rtn Opto isolated expt reset Lo Side P940-L Clock Reset Opto isolated clock reset Hi Side P940-M Clock Rtn Opto isolated clock reset Lo Side P940-N Not Used #1 P940-P Not Used #2 P940-R Not Used #3 P940-S Not Used #4 P940-T Not Used #5 P940-U Not Used #6 P940-V EEPROM Write Enable Opto isolated EEPROM En. Hi Side P940-W EEPROM Enable Rtn Opto isolated EEPROM En. Lo Side P940-X DEP Serial TXD Opto isolated DEP TXD. Hi Side P940-Y DEP Serial TXD Opto isolated DEP TXD. Lo Side P940-Z DEP Serial RXD Opto isolated DEP RXD. Hi Side P940-a DEP Serial RXD Opto isolated DEP RXD. Lo Side P940-b Serial TM Data 2Mbit/sec NRZ serial TM data P940-c Serial TM Data Rtn Expt signal return P940-d Serial Data 2Mbit/sec serial GSE data Hi Side P940-e Serial Data Rtn 2Mbit/sec serial GSE data Lo Side 3

6 FUSP Interface 1100-S-0000 Rev B, Nov 2, Pin Assignment Notes P940-f Serial Clock 2Mbit/sec GSE clock Hi Side P940-g Serial Clk Rtn 2Mbit/sec GSE clock Lo Side P940-h Not Used P940-i Not Used P940-j On Target Digital Discrete from TM/ACS P940-k On Target Rtn Experiment signal return P940-m Expt +28 battery voltage 0-5 Volt Analog P940-n Experiment current 0-5 Volt Analog P940-p Experiment +5 volts 0-5 Volt Analog P940-q Experiment +/- 15 volts 0-5 Volt Analog P940-r Motor +28 volts 0-5 Volt Analog P940-s DEP Cage Temp 0-5 Volt Analog P940-t Motor Current 0-5 Volt Analog P940-u TEC +12 volts 0-5 Volt Analog P940-v Detector Reg +8 volts 0-5 Volt Analog P940-w Detector Reg +28 volts 0-5 Volt Analog P940-x Not Used P940-y Not Used P940-z Detector Int +/- 15 volts 0-5 Volt Analog P940-AA Detector Int +5 volts 0-5 Volt Analog P940-BB Detector Int +5 Aux volts 0-5 Volt Analog P940-CC Expt. Signal Return P940-DD Expt. Signal Return P940-EE Cold Sink Control AD590 Hi to umbilical P940-FF Cold Sink Control AD590 Lo to umbilical P940-GG Audio Speaker Hi to umbilical P940-HH Audio Speaker Lo to umbilical J941: PT07SE-22-55S Pin Assignment Notes J941-A Det. Cold Finger Temp 0-5 Volt Analog J941-B Expt. #3 Temp 0-5 Volt Analog 4

7 FUSP Interface 1100-S-0000 Rev B, Nov 2, Pin Assignment Notes J941-C Coldsink Temp 0-5 Volt Analog J941-D Det. Temp Control Drive 0-5 Volt Analog J941-E TEC Voltage 0-5 Volt Analog J941-F TEC Current 0-5 Volt Analog J941-G Heater Current (not used) 0-5 Volt Analog J941-H Not Used J941-J Powercube Temp 0-5 Volt Analog J941-K Not Used #1 J941-L Not Used #2 J941-M Not Used #3 J941-N Not Used #4 J941-P Not Used #5 J941-R Not Used #6 J941-S Not Used #7 J941-T Not Used #8 J941-U Expt. #1 Temp 0-5 Volt Analog J941-V Expt. #2 Temp 0-5 Volt Analog J941-W Det. Backplate Temp 0-5 Volt Analog J941-X Not Used J941-Y Not Used J941-Z Waveplate Temp 0-5 Volt Analog J941-a Mercury Lamp Temp 0-5 Volt Analog J941-b Mercury Lamp Intensity 0-5 Volt Analog J941-c Det. Vacuum Gauge 0-5 Volt Analog J941-d Expt. Vacuum Gauge 0-5 Volt Analog J941-e Strain Gauge A 0-5 Volt Analog J941-f Strain Gauge B 0-5 Volt Analog J941-g Not Used #1 J941-h Not Used #2 J941-i Not Used #3 J941-j Not Used #4 J941-k Not Used #5 5

8 FUSP Interface 1100-S-0000 Rev B, Nov 2, Pin Assignment Notes J941-m Not Used #6 J941-n Not Used #7 J941-p Not Used #8 J941-q Not Used #9 J941-r Not Used #10 J941-s Waveplate Rotation Pot 0-5 Volt Analog J941-t Waveplate CW Limit 0-5 Volt Analog J941-u Waveplate CCW Limit 0-5 Volt Analog J941-v Waveplate Hall Sensor A 0-5 Volt Analog J941-w Waveplate Hall Sensor B 0-5 Volt Analog J941-x Not Used J941-y Not Used J941-z Not Used J941-AA Not Used J941-BB Detector Readout Flag 0-5 Volt Analog J941-CC Detector Integrate Flag 0-5 Volt Analog J941-DD Detector Shutter Flag 0-5 Volt Analog J941-EE Audio Level 0-5 Volt Analog J941-FF Vac Gauge Filament Mon 0-5 Volt Analog J941-GG Experiment Signal Return J941-HH Experiment Signal Return 4.2 Star Tracker Connectors Control for the three startrackers, ST1(Ball Tracker), ST2 (Experiment Sensor), and ST3 (test startracker), will be via the three star tracker connectors, J712A, P716, and P TBD, mounted on the instrument bulkhead: Pin ST1. J712A: PT07SE-14-18S J712A-A +28V J712A-B J712A-C Description: +28V Rtn 2 Degree FOV Cmd 6

9 FUSP Interface 1100-S-0000 Rev B, Nov 2, Pin Description: J712A-D 4 Degree FOV Cmd J712A-E Tracker HV Cmd J712A-F Acquire Cmd J712A-G X (Ball "Pitch") Error J712A-H Y (Ball "Yaw") Error J712A-J Tracker Lock J712A-K Star Mag J712A-L HV Mon J712A-M Signal Gnd J712A-N Y (Ball "Yaw") Offset J712A-P X (Ball "Pitch") Offset J712A-R Brightness Ctl #1 J712A-S Brightness Ctl #2 J712A-T Chassis Gnd ST2. P716: PT07E-14-18P Pin Description: P716-A +28V P716-B +28V RTN P716-C 2 Degree FOV Cmd (+28V to Assert from ACS) P716-D 4 Degree FOV Cmd (+28V to Assert from ACS) P716-E Tracker HV Cmd (Not Used) P716-F Acquire Cmd (Gnd to Assert from ACS) P716-G X (Ball "Pitch") Error (+/- 6V Analog to TM) P716-H Y (Ball "Yaw") Error (+/- 6V Analog to TM) P716-J Tracker Lock (Discrete to TM; +5V = Lock) P716-K Star Mag (0-5V Analog to TM) P716-L HV Mon (+5V to TM) P716-M Signal Gnd P716-N Z (Roll) Error (+/- 6V Analog to TM) P716-P X (Ball "Pitch") Offset (N/C) P716-R Brightness Ctl #1 (Gnd to Assert from ACS) 7

10 FUSP Interface 1100-S-0000 Rev B, Nov 2, Pin P716-S P716-T P716-U Description: Brightness Ctl #2 (Gnd to Assert from ACS) Chassis Gnd RS232 TXD (38.4 Kbaud to TM) ST3. PTBD: PT07E-14-18P Pin Description: PTBD-A +28V PTBD-B +28V RTN PTBD-C 2 Degree FOV Cmd (+28V to Assert from ACS) PTBD-D 4 Degree FOV Cmd (+28V to Assert from ACS) PTBD-E Tracker HV Cmd (Not Used) PTBD-F Acquire Cmd (Gnd to Assert from ACS) PTBD-G X (Ball "Pitch") Error (+/- 6V Analog to TM) PTBD-H Y (Ball "Yaw") Error (+/- 6V Analog to TM) PTBD-J Tracker Lock (Discrete to TM; +5V = Lock) PTBD-K Star Mag (0-5V Analog to TM) PTBD-L HV Mon (+5V to TM) PTBD-M Signal Gnd PTBD-N Z (Roll) Error (+/- 6V Analog to TM) PTBD-P X (Ball "Pitch") Offset (N/C) PTBD-R Brightness Ctl #1 (Gnd to Assert from ACS) PTBD-S Brightness Ctl #2 (Gnd to Assert from ACS) PTBD-T Chassis Gnd PTBD-U RS232 TXD (38.4 Kbaud to TM) 4.3 Door and Ignitor Housing Connectors The experiment door is controlled via the connector P756. This is wired through to the experiment to the door connector P750. P756: PT06E-12-10P Pin: Description: Destination: P756-A Door Open P750-G 8

11 FUSP Interface 1100-S-0000 Rev B, Nov 2, Pin: Description: Destination: P756-B Door Open P750-H P756-C Door Close P750-J P756-D Door Close P750-K P756-E Pwr Ground P750-L P756-F Pwr Ground P750-M P756-G Close/ Open Mon P750-N P756-H +5V Input P750-P P756-J Position Mon P750-R P756-K Sig Gnd P750-S Control for the ignitor housing will be passed through the experiment section via a bulkhead connector, P757. This is wired through to the experiment to the door connector P750. P757: PT06E-14-19P Pin Description Destination P757-A Sys 1 SCM P750-A' P757-B SCM Data Gnd P750-B' P757-E +5 Volts P750-C' P757-G 2nd Stage Motor Pressure P750-D' P757-H Sep Loop Rtn P750-E' P757-J Sep Loop P750-F' P757-K Sys 2 SCM P750-G' P757-M S-19/ACS BTS Module P750-H' P757-N TM Gnd Bus P750-J' P757-P P757-R P757-S P757-T Not Used Not Used Not Used Not Used P757-U TTS Sig Gnd A P750-U P757-V TTS AGC TM Monitor P750V 9

12 FUSP Interface 1100-S-0000 Rev B, Nov 2, Umbilical - GSE The rocket umbilical connector shall provide for a serial command link between the GSE, within the block house, and experiment DEP. Full duplex ASCII commands will be transmitted over these lines using an optically isolated current loop. Transmission rate shall be 2400 baud. In addition, 3 other optically isolated signals (system reset, clock reset, and parameter EEPROM write enable) are provided through the umbilical connector. Finally, the clock and data from the experiment 2 MHz digital telemetry shall be converted to serial NRZ using a fiberoptic experiment data interface within the TM section, through a fiberoptic pullaway and a fiberoptic umbilical to the blockhouse, where it will be converted back to 2 twisted pairs. A total of 9 twisted pair lines are required to be connected to experiment GSE within the blockhouse (see figure 1). Prior to launch, there is a need to monitor and control the temperature of the cold sink within the payload. A purge/ cooling control system near the rocket rail will require 10 twisted pair lines back to the blockhouse GSE (see figure 1). 10

13 FUSP Interface 1100-S-0000 Rev B, Nov 2, Figure 1. FUSP Experiment/ GSE Block Diagram 11