APPENDIX A TELEMETRY FRAME FORMAT COMPONENTS A1.0 SCOPE This document establishes the Galileo (GLL) Orbiter requirement for telemetry measurements. A2.0 TELEMETRY FRAME FORMAT COMPONENTS A2.1 General The following paragraphs contain the structure and contents of the elements comprising the various data formats found in GLL-3-280, paragraph 3.9. A2.2 Engineering Data The engineering data shall contain a fixed area and a variable area allocation for measurement sampling. The fixed allocation shall be invariant under all the GLL mission phases. The variable area allocation shall accommodate the various mission phase sampling requirements including anomaly investigations, special tests, spacecraft system test, and performance monitoring. The engineering data shall be allocated as shown in Figure A2.2.1 and described in greater detail in Table A2.2.1. (100 LEVEL DECK - LESS HEADER) _____________________________________________________________________________ | | | | | | | | S | | | | | | | | | | |HLM |LLM 1A|LLM 2A|HLM 1B|LLM 1B|LLM 2B|AACS| P |P1|P2|P3|P4|P5|P6|P7|P8|P9| | 1A | DATA | DATA | DATA | DATA | DATA |DATA| A | | | | | | | | | | |DATA| | | | | | | R | | | | | | | | | | | | | | | | | | E | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 40 | 48 | 16 | 40 | 48 | 16 |128 | 8 |40|40|40|40|40|40|40|40|40| |____|______|______|______|______|______|____|___|__|__|__|__|__|__|__|__|__| Figure A2.2.1. Engineering Data A2.2.1 Measurement Position Identification. In order to assign measurements to the engineering data allocation, it is necessary to describe the structure and placement of measurements on the structure. The description must support the ability to command commutation map changes and to identify measurement position within the structure. Within the fixed area and variable area, the structure location shall be as described in the following paragraphs. A2.2.1.1 Fixed-Area Allocation. Using the example in Figure A2.2.2 from HLM1A, the resulting structure and rules for creating the structure identifiers are highlighted. The rules and legal values for creating the identifiers are shown in Table A2.2.2. Table A2.2.1. Engineering Data ____________________________________________________________________ | Bits Offset to | | Data Description Frame Data Start Paragraph | |____________________________________________________________________| | | | High Level Module (HLM)1A 40 0 A2.2.2 | | Data | | | | Low Level Module (LLM)1A 48 40 A2.2.3 | | Data | | | | LLM 2A Data 16 88 A2.2.4 | | | | HLM 1B Data 40 104 A2.2.5 | | | | LLM 1B Data 48 144 A2.2.6 | | | | LLM 2B Data 16 192 A2.2.7 | | | | AACS Data 128 208 A2.2.8 | | | | spare 8 336 | | | | Packet-1 40 344 A2.2.11 | | | | Packet-2 40 384 A2.2.11 | | | | Packet-3 40 424 A2.2.11 | | | | Packet-4 40 464 A2.2.11 | | | | Packet-5 40 504 A2.2.11 | | | | Packet-6 40 544 A2.2.11 | | | | Packet-7 40 584 A2.2.11 | | | | Packet-8 40 624 A2.2.11 | | | | Packet-9 40 664 A2.2.11 | | ___ | | | | 704 | |____________________________________________________________________| (1) HLM-1A N1F 1 8 9 16 17 24 25 32 ----------------------------------------------------- (2) 00| | | | | | | | | | ----------------------------------------------------- 01| | (3) | | | | | | | | ----------------------------------------------------- 02| | | | | | | | | | ----------------------------------------------------- 03| | | (4) | | | | | ----------------------------------------------------- 04| (5) | | | ----------------------------------------------------- 05| | | | | | | | | | ----------------------------------------------------- / | / / / / | \ | \ \ \ \ | / | / / / / | | | ----------------------------------------------------- 90| | | | | | | | | | ----------------------------------------------------- NOTES: (1) THIS SUBCOM (N1F) IS OF LENGTH 91 ("N"), IS THE FIRST SUBCOM OF THIS TYPE IN HLM1A ("1"), AND IS FOUR BYTES WIDE. (2) THIS IDENTIFIES THE SUBCOM POSITION. (3) A MEASUREMENT IN THIS POSITION IS IDENTIFIED AS HLM1A N1F01 2. (4) A MEASUREMENT IN THIS POSITION IS IDENTIFIED AS HLM1A N1F03 3. THE MEASUREMENT CONSISTS OF 16 BITS. (5) A MEASUREMENT IN THIS POSITION IS IDENTIFIED AS HLM1A N1F04 1. THE MEASUREMENT CONSISTS OF 32 BITS. Figure A2.2.2. Fixed Area Structure/Position Identifiers Table A2.2.2. Fixed Area Structure/Position Identifiers ____________________________________________________________________________ | | | | | | |Item| Item Identifier | Contents | Meaning | Comments | |____|________________________|__________|_____________|_____________________| | | | | | | | 1. | Module ID | AACS | |Identifies the module| | | | HLM1A | |which creates the | | | | HLM1B | |fixed area packet. | | | | LLM1A | | | | | | LLM1B | | | | | | LLM2A | | | | | | LLM2B | | | | | | | | | | 2. | Commutation Deck | Z | One |Indicates the repet- | | | Length | S | Seven |ition cycle of the | | | | T | Thirteen |data; e.g., every | | | | N | Ninety One |"n"th frame. | | | | | | | | 3. | Number of Commutation |1 < m < M | |Sequential number of | | | Deck of this Type | | |commutator deck | | | | | |length and width | | | | | |(items 2 and 4). | | | | | | | | 4. | Commutation Deck Width | S | Single Byte |Width of Structure | | | | D | Double Byte | | | | | F | Four Byte | | | | | | | | | 5. | Position in Commutator | See Comments | Item 2 Maximum | | | Deck | | Value | | | | | | | | | | | | Z 0 | | | | | | S 6 | | | | | | T 12 | | | | | | N 90 | | | | | | | | 6. | Measurement | 1 | First Byte |In multiple byte | | | Characteristic | 2 | Second Byte |subcoms, this | | | | 3 | Third Byte |indicates the | | | | 4 | Fourth Byte |position of the | | | | | |measurement in the | | | | | |subcom. Measurements| | | | | |consisting of more | | | | | |than one byte are | | | | | |identified by the | | | | | |position of the most | | | | | |significant byte. | |____|________________________|__________|_____________|_____________________| A2.2.1.2 Variable-Area Allocation. Using the example in Figure A2.2.3 for a typical AACS variable area packet, the resulting structure and the rules for creating the structure/position identifiers are highlighted. The rules and allowed values for creating the identifiers are shown in Table A2.2.3. PACKET (1) AACS-V09S _______ | | | 1 | |_______| P | (2)| O | 2 | S |_______| I | | T | 3 | I |_______| O | | N | 4 | |_______| | | | 5 | |_______| NOTES: (1) THE ILLUSTRATED 5 BYTE PACKET IS THE NINTH ("09") VARIABLE ("V") PACKET FROM "AACS". EACH MEASUREMENT IS NOMINALLY ONE BYTE ("S"). (2) A MEASUREMENT IS PLACED IN POSITION "2" OF THE VARIABLE PACKET (a) TO IDENTIFY A SINGLE BYTE ASSIGNMENT IN THIS LOCATION, THE POSITION IDENTIFIER IS AACS-V09S2F (b) TO IDENTIFY A TWO BYTE ASSIGNMENT IN THIS LOCATION, THE POSITION IDENTIFIER IS AACS-V09S2D (c) TO IDENTIFY ONE HALF OF A TWO BYTE ASSIGNMENT IN THIS LOCATION, THE POSITION IDENTIFIER IS AACS-V09S2L (LEFT BYTE) OR AACS-V09S2R (RIGHT BYTE) Figure A2.2.3. Variable Area Packet Structure/Position Identifiers Table A2.2.3. Variable Area Packet Structure/Position Identifiers Item Identifier Contents Meaning Comments _______________________________________________________________________ | 1 | Module ID | AACS | |Identifies the module | | | | HLM 1A | |which creates the | | | | HLM 1B | |variable area | | | | LLM 1A | |packet | | | | LLM 1B | | | | | | LLM 2A | | | | | | LLM 2B | | | | | | | | | | 2 | Variable | V |Variable area|Used to differentiate | | | Packet | |packet of |between fixed area | | | | |length 5 |and variable area | | | | | |packets | | | | | | | | 3 | Packet | 01 < n < 16 | |Identifies the | | | number | | |specific packet | | | | | |within the module of | | | | | |interest | | | | | | | | 4 | Width | S |Single Byte | | | | ________________________________________ | | | | Description stops here if desire is to | | | | | just identify packet. To identify a | | | | | specific position, the remaining items | | | | | are used. | | | | |________________________________________| | | 5 | Packet | 1 < posi- | |Position within | | | Position | tions < 5 | |packet | | | | | | | | 6 | Measurement| F |1 byte mea- | | | | Character- | |surement | | | | istic | | | | | | | | | | | | | D |2 byte mea- |Packet position < 4 | | | | |surement | | | | | | | | | | | L |Left byte |Left byte of 2 byte | | | | | |measurement assigned | | | | | |to specific packet | | | | | |position | | | | | | | | | | R |Right byte |Right byte of 2 byte | | | | | |measurement assigned | | | | | |to specific packet | | | | | |position | |___|____________|________________|_____________|_______________________| HLM-1A N1F HLM-1A N1S 1 8 9 16 17 24 25 32 1 8 00| | | | || | | | | | || | 01| | | | || | | | | | || | 02| | | | || | | | | | || | 03| | | | || | | | | | || | 04| | | | || | | | | | || | 05| | | | || | | | | | || | / | / / / / || / | \ | \ \ \ \ || \ | / | / / / / || / | | || | 90| | | | || | | | | | || | Figure A2.2.4. HLM 1A Data Packet A2.2.2 High Level Module 1A Data Packet. The fixed area allocation for HLM 1A shall contain those measurements created within or sampled by HLM 1A. The structure associated with the HLM 1A data shall be as shown in Figure A2.2.4 (refer to paragraph A2.2.1.1 for the interpretation of the identifiers shown in the figure). LLM-1A S1S LLM-1A S2S LLM-1A T1S LLM-1A T2S LLM-1A N1D 1 8 1 8 1 8 1 8 1 8 9 16 00| || || || || | | |__________||__________||__________||__________||__________|__________| 01| || || || || | | |__________||__________||__________||__________||__________|__________| 02| || || || || | | |__________||__________||__________||__________||__________|__________| 03| || || || || | | |__________||__________||__________||__________||__________|__________| 04| || || || || | | |__________||__________||__________||__________||__________|__________| 05| || || || || | | |__________||__________||__________||__________||__________|__________| 06| || || || || | | |__________||__________||__________||__________||__________|__________| 07 | || || | | |__________||__________||__________|__________| 08 | || || | | |__________||__________||__________|__________| 09 | || || | | |__________||__________||__________|__________| 10 | || || | | |__________||__________||__________|__________| 11 | || || | | |__________||__________||__________|__________| 12 | || || | | |__________||__________||__________|__________| 13 | / / | / | \ \ | \ | / / | / |__________ __________| 90 | | | |__________|__________| Figure A2.2.5. LLM 1A Data Packet A2.2.3 Low Level Module 1A Data Packet. The fixed area allocation for LLM 1A shall contain those measurements created within or sampled by LLM 1A. The structure associated with LLM 1A data shall be as shown by Figure A2.2.5 (refer to paragraph A2.2.1.1 for the interpretation of the identifiers shown on the figure). LLM-2A N1D 1 8 9 16 ____________ ____________ 00| | | |____________|____________| 01| | | |____________|____________| 02| | | |____________|____________| 03| | | |____________|____________| 04| | | |____________|____________| 05| | | |____________|____________| 06| | | |____________|____________| 07| | | |____________|____________| / | / / | \ | \ \ | / | / / | |____________ ____________| 90| | | |____________|____________| Figure A2.2.6. LLM 2A Data Packet A2.2.4 Low Level Module 2A Data Packet. The fixed area allocation for LLM 2A shall contain those digital or software measurements created within or sampled by LLM 2A. Analog measurements on the despun side of the spacecraft shall be sampled by either LLM 2A or LLM 2B depending on the spacecraft hardware configuration. The structure associated with LLM 2A data shall be as shown by the Figure A2.2.6 (refer to paragraph A2.2.1.1 for the interpretation of the identifiers shown on the figure). HLM-1B N1F HLM-1B N1S 1 8 9 16 17 24 25 32 1 8 00| | | | || | |____________|____________|____________|____________||____________| 01| | | | || | |____________|____________|____________|____________||____________| 02| | | | || | |____________|____________|____________|____________||____________| 03| | | | || | |____________|____________|____________|____________||____________| 04| | | | || | |____________|____________|____________|____________||____________| 05| | | | || | |____________|____________|____________|____________||____________| / | / / / / || / | \ | \ \ \ \ || \ | / | / / / / || / | |____________ ____________ ____________ ____________||____________| 90| | | | || | |____________|____________|____________|____________||____________| Figure A2.2.7. HLM 1B Data Packet A2.2.5 High Level Module 1B Data Packet. The fixed area allocation for HLM 1B shall contain those measurements created within or sampled by HLM 1B. The structure associated with HLM 1B data shall be as shown by Figure A2.2.7 (refer to paragraph A2.2.1.1 for the interpretation of the identifiers shown in the figure). LLM-1B S1S LLM-1B S2S LLM-1B T1S LLM-1B T2S LLM-1B N1D 1 8 1 8 1 8 1 8 1 8 9 16 00| || || || || | | |__________||__________||__________||__________||__________|__________| 01| || || || || | | |__________||__________||__________||__________||__________|__________| 02| || || || || | | |__________||__________||__________||__________||__________|__________| 03| || || || || | | |__________||__________||__________||__________||__________|__________| 04| || || || || | | |__________||__________||__________||__________||__________|__________| 05| || || || || | | |__________||__________||__________||__________||__________|__________| 06| || || || || | | |__________||__________||__________||__________||__________|__________| 07 | || || | | |__________||__________||__________|__________| 08 | || || | | |__________||__________||__________|__________| 09 | || || | | |__________||__________||__________|__________| 10 | || || | | |__________||__________||__________|__________| 11 | || || | | |__________||__________||__________|__________| 12 | || || | | |__________||__________||__________|__________| 13 | / / | / | \ \ | \ | / / | / |__________ __________| 90 | | | |__________|__________| Figure A2.2.8. LLM 1B Data Packet A2.2.6 Low Level Module 1B Data Packet. The fixed area allocation for LLM 1B shall contain those measurements created within or sampled by LLM 1B. The structure associated with LLM 1B data shall be as shown by the Figure A2.2.8 (refer to paragraph A2.2.1.1 for the interpretation of the identifiers shown on the figure). LLM-2B N1D 1 8 9 16 00| | | |____________|____________| 01| | | |____________|____________| 02| | | |____________|____________| 03| | | |____________|____________| 04| | | |____________|____________| 05| | | |____________|____________| 06| | | |____________|____________| 07| | | |____________|____________| / | / / | \ | \ \ | / | / / | |____________ ____________| 90| | | |____________|____________| Figure A2.2.9. LLM 2B Data Packet A2.2.7 Low Level Module 2B Data Packet. The fixed allocation for LLM 2B shall contain those digital or software measurements created within or sampled by LLM 2B. Analog measurements on the despun side of the spacecraft shall be sampled by either LLM 2A or LLM 2B depending on the spacecraft hardware configuration. The structure associated with LLM 2B data shall be as shown by the Figure A2.2.9 (refer to paragraph A2.2.1.1 for the interpretation of the identifiers shown in the figure). 1____16 1____16 1____16 1____16 1____16 1____16 1____16 1__8 1__8 00 | || || || || || || || || | |_______||_______||_______||_______||_______||_______||_______||____||____| 01 | || || || || | |_______||_______||_______||_______||_______| 02 | || || || || | |_______||_______||_______||_______||_______| 03 | || || || || | |_______||_______||_______||_______||_______| 04 | || || || || | |_______||_______||_______||_______||_______| 05 | || || || || | |_______||_______||_______||_______||_______| 06 | || || || || | |_______||_______||_______||_______||_______| 07 | || || || || | |_______||_______||_______||_______||_______| 08 | || || || || | |_______||_______||_______||_______||_______| 09 | || || || || | |_______||_______||_______||_______||_______| 10 | || || || || | |_______||_______||_______||_______||_______| 11 | || || || || | |_______||_______||_______||_______||_______| 12 | || || || || | |_______||_______||_______||_______||_______| 13 | || | |_______||_______| 14 | || | |_______||_______| 15 | || | |_______||_______| / | / || / | \ | \ || \ | / | / || / | |_______||_______| 90 | || | |_______||_______| Figure A2.2.10. AACS Data Packet A2.2.8 Attitude and Articulation Control Subsystem Data Packet. The fixed area allocation for the AACS shall contain those measurements created within or sampled by AACS. The structure associated with AACS data shall be as shown by Figure A2.2.10 (refer to paragraph A2.2.1.1 for the interpretation of the identifiers shown in the figure). A2.2.9 DELETED A2.2.10 DELETED MODULE-VnnS 1 40 _____________________________________________________ POSITION | | | | | | NUMBER | 1 | 2 | 3 | 4 | 5 | | | | | | | BITS | 8 | 8 | 8 | 8 | 8 | |_________|__________|__________|__________|__________| Figure A2.2.11. Variable Packet A2.2.11 Variable Area Packets. The variable area packets shall be identical in structure within each of the CDS and AACS computer modules. These packets shall accommodate the various mission phase differences in measurement sampling requirements. The structure associated with each packet shall be as shown in Figure A2.2.11 (refer to paragraph A2.2.1.2 for the interpretation of the identifiers shown in the figure). In any variable packet it shall be prohibited to create subcommutators within any position of the packet. There shall be no restriction as to the measurements which may be assigned to these packets. A2.2.12 Measurement Sampling Times. The measurements placed into the engineering packet shall be sampled as specified in the succeeding paragraphs. A2.2.12.1 Fixed Area Measurement Timing: CDS. Data sampled by a CDS High Level Module shall be sampled as specified in A2.2.12.1.1. Data sampled by a CDS Low Level Module shall be sampled as specified in A2.2.12.1.2. A2.2.12.1.1 CDS High Level Module Sampling. Within the CDS, the data subcommutated into the HLM area of an engineering frame shall have been sampled during the MOD91=89 of the RIM previous to the RIM contained in the header. A2.2.12.1.2 CDS Low Level Module Sampling. Within the CDS, software measurements subcommutated into the LLM area of an engineering frame shall have been sampled during the MOD91=89 of the RIM previous to the RIM contained in the header. The exceptions are the DMS Position Estimates (E-0423. E-0424, E-0923, and E-0924), and the Discharge Controller Use Counter (E-0089). These are sampled in the MOD91 previous to the MOD91 contained in the header. Hardware measurements (Analog, Digital, and Temperature) shall be sampled as shown in Table A2.2.4. Table A2.2.4. CDS Fixed Area Measurement Sampling Time (Milliseconds offset prior to SCLK) _________________________________________________ | Subcommutation Deck | _____________________|_______________________________________________| | | | S1S | S2S | T1S | T2S | N1D | N1D | | Telemetry | Rate | | | | | Left | Right | | Mode | b/s | | | | | Byte | Byte | |______________|______|_______|_______|_______|_______|_______|_______| | 1200 b/s | 1200 |646-2/3| 580 |446-2/3| 380 |246-2/3| 180 | |______________|______|_______|_______|_______|_______|_______|_______| Table A2.2.5. CDS Variable Packet Measurement Sampling Time (milliseconds offset prior to SCLK) ___________________________________________________________ | Packet(1)| | | Timing | Position Within Packet | | Position | 1 | 2 | 3 | 4 | 5 | | A | 666-2/3| 533-1/3 | 400 | 266-2/3 | 133-1/3 | | | | | | | | | B | 633-1/3| 500 | 366-2/3 | 233-1/3 | 100 | | | | | | | | | C | 600 | 466-2/3 | 333-1/3 | 200 | 66-2/3 | | | | | | | | | D | 566-2/3| 433-1/3 | 300 | 166-2/3 | 33-1/3 | | | | | | | | | E | 653-1/3| 520 | 386-2/3 | 253-1/3 | 120 | | | | | | | | | F | 606-2/3| 473-1/3 | 340 | 206-2/3 | 73-1/3 | | | | | | | | | G | 586-2/3| 453-1/3 | 320 | 186-2/3 | 53-1/3 | | | | | | | | | H | 540 | 406-2/3 | 273-1/3 | 140 | 6-2/3 | | | | | | | | | I | 460 | 440 | 426-2/3 | 420 | 413-1/3 | |__________|________|_________|_________|_________|_________| (1) In creating an engineering map, any of the packets (01 < n < 16) within a module may be assigned to the packet timing position A, B, C, D, E, F, G, H, or I. A2.2.12.2 Variable Packet Measurement Timing: CDS. Within any CDS module creating variable area packets, the sample time relationship shown in Table A2.2.5 shall be maintained. A2.2.12.3 Measurement Timing: AACS. Within the AACS, the data sampling shall occur during RTI 0 (MOD 10=0). Table A2.2.6 DELETED A2.2.13S/C High Rate Sampling. A2.2.13.1 CDS Single Identifier (SID) Mode. In order to assist in the investigation of spacecraft anomalies, it shall be possible to replace all of the variable engineering data with a single measurement. The measurement will be placed in all five positions of a packet, and then that packet shall occupy all timing positions shown in Table A2.2.5. DELETED A2.2.13.2 AACS Flood Mode. The AACS shall not be required to originate single-ID telemetry (hog-mode). Instead, for calibration of more volatile AACS measurements, a calibration measurement readout, popularly called "flood-mode" telemetry, shall be provided. The AACS shall at all times collect 6 measurements, in a 61 word rotating buffer, every 66 2/3 msec. The 6 measurements to be collected shall be capable of being specified by uplink commands. The MSS shall be provided with the ability to collect the AACS calibration buffer from the AACS and accumulate it in a larger buffer in the CDS once every 2/3 sec. for a period of up to 28 seconds, by means of an uplinked command sequence. Then the accumulated CDS buffer shall be transmitted to the ground by means of the standard memory readout telemetry capability, as the final step in the command sequence. The scheduling of a calibration readout sequence shall be constrained by other sequencing events to those periods when the CDS accumulation buffer can be made available. A2.2.14 Engineering Measurements and Formats This section identifies the GLL engineering measurements, engineering formats, and commutator position assignments of each measurement within the engineering formats. A2.2.14.1 Engineering Measurement Detailed Data Table A2.2.8 provides detailed data for each engineering measurement. This data includes measurement engineering number (E-No.), title, identification (treeswitch or other identification, as appropriate), engineering unit range, number of bits, and type (analog/temperature/digital/software). The table headings are as follows: NUMBER refers to engineering number. MEASUREMENT TITLE is the name of the measurement. ENGINEERING RANGE refers to the engineering range of the measurement, with degrees given in Celsius for temperature measurements. TREE POS refers to the hardware treeswitch position. COMM POS refers to the position in the engineering commutator, and therefore the frequency of sampling, of engineering measurements. NO. OF BITS indicates how many bits the measurement contains. FLAGS refers to 2 flags, with the first flag (F, V, or B) referring to whether the measurement is in the fixed commutator area only, the variable commutator area only, or both. The second flag (A, T, D, or S) denotes whether the measurement is an analog measurement, a temperature measurement, a digital measurement, or a software measurement. Digital and Software bit definitions are shown in Table A2.2.9. Eight despun measurements are multiplexed into the back-up despun measurement (BDM) channels (E-1109, E-1110, E-1129, E-1130). The multiplexing is controlled using 3 bits in the despun CRC registers known as the "Despun CRC backup mux select bits A, B, and C" as shown in Table A2.2.7. Table A2.2.7. Backup Multiplexed Measurements _______________________________________________________________ | DESPUN CRC BACK-UP | | | | MUX SELECT BIT | CHANNEL | | | C | B | A |ASSIGNMENT| MEASUREMENT SELECTED | | 0 | 0 | 0 | BDM 00 | RRA position pot. 2 | | 0 | 0 | 1 | BDM 01 | spare measurement | | 0 | 1 | 0 | BDM 02 | CDS +3VDC to RRA pot. 1 | | 0 | 1 | 1 | BDM 03 | CDS despun commutator tree out| | 1 | 0 | 0 | BDM 04 | CDS despun signal ground | | 1 | 0 | 1 | BDM 05 | CDS filter calibration voltage| | 1 | 1 | 0 | BDM 06 | Unused | | 1 | 1 | 1 | BDM 07 | Unused | |______|_______|_____|__________|_______________________________| Measurements from the contamination monitor are multiplexed through channel E-0016. The CM's multiplexer is unsynched to the CDS and utilizes two reference voltage states (0 and 3 volts) at the start of each data cycle to enable MOS to reconstruct the data. Each CM multiplexer state lasts for 3 minutes. The multiplexer states are described in Table A2.2.7A. Table A2.2.7A CM Multiplexed Measurements __________________________________________________________ | Multiplexer | | | State | Measurement | |_____________|____________________________________________| | | | | 0 | 0 volt reference (used to sync CM data) | | 1 | 3 volt reference (used to sync CM data) | | 2 | QCM 1 output frequency | | 3 | QCM 1 temperature measurement | | 4 | QCM 2 output frequency | | 5 | QCM 2 temperature measurement | | 6 | QCM 3 output frequency | | 7 | QCM 3 temperature measurement | |_____________|____________________________________________|