PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 OBJECT = TEXT PUBLICATION_DATE = 1999-08-12 NOTE = "DSN Software Interface Specification for Medium Band POCA Data ODR Tape. Converted to digital format with minor editorial changes 1999-08-12. Original date unknown, but probably 1980-era. Handwritten notes on hard copy suggest definitions for Words 1-3 may be suspect and that Time of Day in Words 29-30 is in UT." END_OBJECT = TEXT END 820-13, RSC-11-5 MEDIUM-BAND POCA DATA ODR TAPE WORD 1 Tape Number: Bits 9 through 16. Binary integer. Unused Bits.: Bits 1 through 8. Undefined WORD 2 Record Number: Binary integer (16-bit). WORD 3 Record Length: Binary integer (16-bit). Number of words in the record. Set to 228 WORD 4 Spacecraft Number: Bits 1 through S. Binary representation of spacecraft number (refer to 820-13, module OPS 6-6). Source Station: Bits 9 through 16. Binary representation of DSS station number. WORD 5,6 Predict Set ID: Four ASCII characters. WORD 7 Unused. Undefined -------------------------820-13,RSC-11-5------------------------- ------------------------------1 of 4----------------------------- WORDS 8,9 Predict Base Frequency: 32-bit integer Hz. LSB is bit 16 of word 9. WORDS 10 through 28 Unused. Undefined WORDS 29,30 Day of Year Bits 1 through 9 of word 29. Binary integer number. Time of Day A 17-bit binary number representing the number of seconds since the start of the day. MSB is word 29, bit 16; LSB is word 30, bit 16. Unused Bits Word 29, bits 10 through 15. Undefined WORDS 31,32,33 POCA Frequency (displaced) The contents of the POCA frequency registers, less the predict base frequency (see words 8-9). Formatted as a 48-bit binary number with the LSB= 2 20 Hz (bit 16 of word 33). Value may be positive or negative (2's complement format). WORDS 34,35,36 POCA Ramp Rate The POCA ramp rate in Hertz/second. Formatted as a 48-bit binary number, with the LSB (word 36, bit 16) equal to 2-20 Hz/second. WORD 37 Frequency-Monitor Subassembly (FMS) Status Bit 1: 0= FMS ON, 1= OFF Bits 3,4: Test signal selection 01= Input #1 (POCA) 10= Input #2 11= Internal Signal 00= Spare (not used) -------------------------820-13,RSC-11-5------------------------- ------------------------------2 of 4----------------------------- WORD 37 (cont.) Bit 7: Counter #1 signal selection 1= Input #1 (POCA), 0= Test signal Bit 8: Counter #2 signal selection 1= Input #2, 0= Test signal Programmed Oscillator Control Assy (POCA) Status Bit 9: 1= Manual Control, O= Computer Control* Bit 10: 1= Ready*, 0= Not Ready Bit 11: 1= Synth. Power On*, 0= Off Bit 12: 1= Synth. In Lock*, 0= Out-of lock Bit 13: 1= Limit Enable On, O= Off* Bit 14: 1= Track On*, O= Off Bit 15: 1= Acquisition On, 0= Off* Bit 16: 1= Sweep On*, 0= Off * Indicates normal state for Radio Science. Unused Bits: Bits 2,5,6. Undefined. WORDS 38,39,40 Frequency Monitor #1 Data. Cumulative phase in cycles. Formatted as a 48-bit binary number, with the LSB (word 40, bit 16) equal to 2^-8 cycles. WORDS 41,42,43 Frequency Monitor #2 Data. Cumulative phase in cycles. Formatted as a 48-bit binary number, with the LSB (word 43, bit 16) equal to 2^-8 cycles. WORDS 44,45,46 Predict Frequency (displaced) The actual predict frequency, less the predict base frequency (see words 8-9). Formatted as a 48-bit binary number, with the LSB (bit 16 of word 46) equal to 2^-20 Hz. Value may be positive or negative (2's complement format). WORDS 47,48 Unused. Undefined -------------------------820-13,RSC-11-5------------------------- ------------------------------3 of 4----------------------------- WORDS 49 through 68 Same format as words 29 through 48, for second n + 1. WORDS 69 through 88 Same format as words 29 through 48, for second n + 2. WORDS 89 through 108 Same format as words 29 through 48, for second n + 3. WORDS 109 through _128 Same format as words 29 through 48, for second n + 4. WORDS 129 through 148 Same format as words 29 through 48, for second n + 5. WORDS 149 through 168 Same format as words 29 through 48, for second n + 6. WORDS 169 through 188 Same format as words 29 through 48, for second n + 7. WORDS 189 through 208 Same format as words 29 through 48, for second n + 8. WORDS 209 through 228 Same format as words 29 through 48 for second n + 9. -------------------------820-13,RSC-11-5------------------------- ------------------------------4 of 4-----------------------------