urn:nasa:pds:mess_mla_raw:data_edr:mlasci1206111505_dat 1.0 1.10.1.0 Product_Observational 2018-06-08 1.0 PDS4 migrated product 2012-06-11T15:05:42Z 2012-06-11T15:08:18Z MESSENGER Mission urn:nasa:pds:context:investigation:mission.messenger data_to_investigation MESSENGER Spacecraft urn:nasa:pds:context:instrument_host:spacecraft.mess is_instrument_host Mercury Laser Altimeter Instrument urn:nasa:pds:context:instrument:mla.mess is_instrument Mercury Planet urn:nasa:pds:context:target:planet.mercury data_to_target Mercury Orbit Year 2 1/247914608 1/247914764 mlascienceraw pipe-mla2edr 1.0 mlasci1206111505.dat 2012-06-11T21:21:55Z 0 157 This table contains one set of MLA Raw Science values, as reported by the MESSENGER Mercury Laser Altimeter (MLA). Additional details are contained in the EDR SIS document. 65 65 1076 met 1 1 UnsignedMSB4 4 Mission elapsed time in seconds. rx_edge_miscompare 2 5 UnsignedByte 1 Check timestamps for high return pulse leading and trailing edge. =0 normal, =1 trailing edge is timestamped before leading edge. rmu_babblebit 3 6 UnsignedByte 1 Check that the bus between RMU and CPU is quiet for 15ms between RMU time zero and RUPT. =0 no violation, =1 at least one quiet time violation has occured. endof_superframe 4 7 UnsignedByte 1 "A superframe is 10 seconds of science data. This flags the end of the superframe on the 10th second. =0, seconds 1-9 of superframe =1, 10th second of superframe. endof_frame 5 8 UnsignedByte 1 A frame is two seconds of science data. Some calculations are made across frames. =0 second 1, =1 second 2. ch3_config 6 9 UnsignedByte 1 The detector 3 configuration assumed by the science task. =0 disabled, =1 enabled. ch2_config 7 10 UnsignedByte 1 The detector 2 configuration assumed by the science task. =0 disabled, =1 enabled. ch1_lo_config 8 11 UnsignedByte 1 The detector 1 low configuration assumed by the science task. =0 disabled, =1 enabled. ch1_hi_config 9 12 UnsignedByte 1 The detector 1 high configuration assumed by the science task. =0 disabled, =1 enabled. timing_valid 10 13 UnsignedByte 1 Check of timing integrity at a rate of once per second. Three checks are performed: 1. Has MET message from S/C been received 2. Has the 1PPS signal from the S/C been received 3. Is the phase lock to the 1PPS off by more than 5us If any of the checks fail then the timing integrity is in question. =0 Timing integrity fine, =1 Timing integrity under question. curr_sc_flag 11 14 UnsignedByte 1 Reserved spare value. mode_2_submode 12 15 UnsignedByte 1 Reserved spare value. sc_range_mode 13 16 UnsignedByte 1 =0 latest range message received is valid. =1 latest range message received is invalid. algorithm_mode 14 17 UnsignedByte 1 The actual algorithm mode being run. =0 Fixed Mode, =1 Spacecraft Range Mode. lsr_pulse_wid_max 15 18 UnsignedByte 1 Maximum width of laser pulse, measured by the HSI as microseconds between rising and falling edge on the laser diode pulse signal. Maximum value out of 8 shots fired in one second. lsr_pulse_wid_min 16 19 UnsignedByte 1 Minimum width of laser pulse, measured by the HSI as microseconds between rising and falling edge on the laser diode pulse signal. Minimum value out of 8 shots fired in one second. lsr_pulse_wid_mean 17 20 UnsignedByte 1 Average width of laser pulse, measured by HSI as microseconds between rising and falling edge on the laser diode pulse signal. Average of 8 shots fired in one second. 1 8 1 0 21 16 startpls_lead_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the leading edge start pulse for each of the eight shots fired in one second. 2 8 1 0 37 16 startpls_lead_fine 1 1 UnsignedMSB2 2 Fine time counts of the leading edge start pulse for each of the eight shots fired in one second. 3 8 1 0 53 8 startpls_trail_coarse 1 1 UnsignedByte 1 Coarse time counts of the trailing edge start pulse for each of the eight shots fired in one second. 4 8 1 0 61 16 startpls_trail_fine 1 1 UnsignedMSB2 2 Fine time counts of the trailing edge start pulse for each of the eight shots fired in one second. diode_curr_max 18 77 UnsignedByte 1 Raw A/D counts of maximum measured laser diode current. diode_curr_min 19 78 UnsignedByte 1 Raw A/D counts of minimum measured laser diode current. diode_curr_mean 20 79 UnsignedByte 1 Raw A/D counts of average measured laser diode current. 5 8 1 0 80 8 tx_pls_energy 1 1 UnsignedByte 1 Raw A/D counts of the measured transmitted pulse energy for each of eight shots fired in one second. ch1hi_pls_id 21 88 UnsignedByte 1 Flag noting the status of the each of eight pulse returns detected by Channel 1 High. =0 valid pulse. =1 invalid pulse. range_gate_start 22 89 UnsignedMSB2 2 Range gate start read back from RMU; units of 30 meters. range_gate_stop 23 91 UnsignedMSB2 2 Range gate stop read back from RMU; units of 30 meters. ch1_hi_thld_shot1 24 93 UnsignedByte 1 The commanded value of the threshold for channel 1 high, shots 1-4. Calculated every 4 shots by science task. ch1_hi_thld_shot5 25 94 UnsignedByte 1 The commanded value of the threshold for channel 1 high, shots 5-8. Calculated every 4 shots by science task. ch1_lo_thld_shot1 26 95 UnsignedByte 1 The commanded value of the threshold for channel 1 low, shots 1-4. Calculated every 4 shots by science task. ch1_lo_thld_shot5 27 96 UnsignedByte 1 The commanded value of the threshold for channel 1 low, shots 5-8. Calculated every 4 shots by science task. ch2_thld_shot1 28 97 UnsignedByte 1 The commanded value of the threshold for channel 2, shots 1-4. Calculated every 4 shots by science task. ch2_thld_shot5 29 98 UnsignedByte 1 The commanded value of the threshold for channel 2, shots 5-8. Calculated every 4 shots by science task. ch3_thld_shot1 30 99 UnsignedByte 1 The commanded value of the threshold for channel 3, shots 1-4. Calculated every 4 shots by science task. ch3_thld_shot5 31 100 UnsignedByte 1 The commanded value of the threshold for channel 3, shots 5-8. Calculated every 4 shots by science task. vga_setting 32 101 UnsignedByte 1 Commanded value for VGA gain, sampled for first shot. noise_ch1_hi_1_4 33 102 UnsignedByte 1 Number of noise hits detected on Channel 1 high, summed over shots 1-4. noise_ch1_hi_5_8 34 103 UnsignedByte 1 Number of noise hits detected on Channel 1 high, summed over shots 5-8. noise_ch1_lo_1_4 35 104 UnsignedByte 1 Number of noise hits detected on Channel 1 low, summed over shots 1-4. noise_ch1_lo_5_8 36 105 UnsignedByte 1 Number of noise hits detected on Channel 1 low, summed over shots 5-8. noise_ch2_1_4 37 106 UnsignedByte 1 Number of noise hits detected on Channel 2, summed over shots 1-4. noise_ch2_5_8 38 107 UnsignedByte 1 Number of noise hits detected on Channel 2, summed over shots 5-8. noise_ch3_1_4 39 108 UnsignedByte 1 Number of noise hits detected on Channel 3, summed over shots 1-4. noise_ch3_5_8 40 109 UnsignedByte 1 Number of noise hits detected on Channel 3, summed over shots 5-8. range_rate 41 110 UnsignedByte 1 Current spacecraft range - last known good range divided by the number of seconds between them. Expressed in units of 30 meters per second. Calculated once per second. signal_bins 42 111 UnsignedMSB2 2 For odd numbered seconds it gives the signal bin number for the appropriate lower histogram. For even numbered seconds it gives the signal bin number for the upper histogram. bin_thld 43 113 UnsignedMSB2 2 For odd numbered seconds it is the minimum count needed in a bin of a lower histogram in order to establish signal for that histogram. For even numbered seconds it gives the minimum count of the number of returns summed over all of the bins in the upper histogram that are needed to establish a signal. frame_rx_proc_cnt 44 115 UnsignedMSB2 2 Number of returns tabulated in a lower histogram during a frame (2 seconds). sc_range 45 117 UnsignedMSB2 2 The spacecraft range value used by the science task for algorithm calculations. Note: as soon as the science task receives a range message it begins using the new range in its calculations. Thus the spacecraft range in telemetry may NOT be the one used throughout the entire second of algorithm calculations. spare 46 119 UnsignedByte 1 Spare column. out_of_sync 47 120 UnsignedByte 1 The first shot of every second the science task checks itself to determine if it is in synch with the flight software. =0 in synch with 1PPS. =1 out of synch with 1PPS. startpls_invalid 48 121 UnsignedByte 1 =0 all start pulses for the second were valid. =1 at least one start pulse during the second was invalid. rmu_write_err 49 122 UnsignedByte 1 Verification of range gate values written to the RMU. =0 no error. =1 error. invalid_config 50 123 UnsignedByte 1 Flags an invalid configuration for science task and spacecraft range mode. =0 valid config, =1 invalid config. corrupt_mem 51 124 UnsignedByte 1 Science task check on variables that should never go outside a certain range. This should never be 1. =0 variables okay. =1 variables not okay. signal_found 52 125 UnsignedByte 1 Indicates whether upper or lower histograms have been found by science task when processing 10 seconds worth of science data. =0 no signal. =1 upper histogram (high returns) found. =2 lower histogram (low returns) found. =3 both upper and lower histogram found. sig_fram_per_super 53 126 UnsignedByte 1 The number of frames in the superframe showing a signal. There are 5 frames per superframe. NOTE: There must be at least 4 out of 5 frames showing signal in order to have a signal based on the lower histograms. rdot_fit_err 54 127 UnsignedByte 1 Reserved spare value. secs_to_cmp_rdot 55 128 UnsignedByte 1 Number of seconds used when computing range rate. Nominally one. If value reaches 10 then science task will stop trying to use spacecraft range. time_1hz_to_rupt_0_15 56 129 UnsignedMSB2 2 The time in from the 1PPS signal to the first RUPT of the second. This telemetry point is the least significant 16 bits of the time. time_1hz_to_rupt_16_23 57 131 UnsignedMSB2 2 The time in from the 1PPS signal to the first RUPT of the second. This is the most significant 8 bits of the time. 6 8 1 0 133 16 ch1_hi_rx_lead_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the leading edge channel 1 high returns. One timestamp per shot, 8 shots total. 7 8 1 0 149 16 ch1_hi_rx_lead_fine 1 1 UnsignedMSB2 2 Fine time counts of the leading edge channel 1 high returns. One timestamp per shot, 8 shots total. 8 8 1 0 165 8 ch1_hi_rx_trail_coarse 1 1 UnsignedByte 1 Coarse time counts of the trailing edge minus the coarse time counts of the leading edge channel 1 high returns (4 least significant bits). One timestamp per shot, 8 shots total. 9 8 1 0 173 16 ch1_hi_rx_trail_fine 1 1 UnsignedMSB2 2 Fine time counts of the trailing edge channel 1 high returns. One timestamp per shot, 8 shots total. wide_filt_rx_cnt_1 58 189 UnsignedByte 1 Total number of wide filter low returns for shot 1, maximum is 10. wide_filt_rx_cnt_2 59 190 UnsignedByte 1 Total number of wide filter low returns for shot 2, maximum is 10. wide_filt_rx_cnt_3 60 191 UnsignedByte 1 Total number of wide filter low returns for shot 3, maximum is 10. wide_filt_rx_cnt_4 61 192 UnsignedByte 1 Total number of wide filter low returns for shot 4, maximum is 10. wide_filt_rx_cnt_5 62 193 UnsignedByte 1 Total number of wide filter low returns for shot 4, maximum is 10. wide_filt_rx_cnt_6 63 194 UnsignedByte 1 Total number of wide filter low returns for shot 6, maximum is 10. wide_filt_rx_cnt_7 64 195 UnsignedByte 1 Total number of wide filter low returns for shot 7, maximum is 10. wide_filt_rx_cnt_8 65 196 UnsignedByte 1 Total number of wide filter low returns for shot 8, maximum is 10. 10 10 1 0 197 10 shot1_rx_lead_id 1 1 UnsignedByte 1 Identifies channel of low return leading edge shot 1 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 11 10 1 0 207 20 shot1_rx_lead_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the leading edge shot 1, low return pulses. If less than 10 returns collected then unused item slots are 0. 12 10 1 0 227 20 shot1_rx_lead_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the leading edge shot 1, low return pulses. If less than 10 returns collected then unused item slots are 0. 13 10 1 0 247 10 shot1_rx_trail_id 1 1 UnsignedByte 1 Identifies channel of low return trailing edge shot 1 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 14 10 1 0 257 20 shot1_rx_trail_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the trailing edge minus the coarse time counts of the leading edge shot 1 low return pulses. If less than 10 returns collected then unused item slots are 0. 15 10 1 0 277 20 shot1_rx_trail_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the trailing edge shot 1, low return pulses. If less than 10 returns collected then unused item slots are 0. 16 10 1 0 297 10 shot1_rx_valid_return 1 1 UnsignedByte 1 Flag whether the shot 1 returns are valid. Valid returns are defined as having the same non-zero lead and trail ID value. =1 valid, =0 invalid. 17 10 1 0 307 10 shot2_rx_lead_id 1 1 UnsignedByte 1 Identifies channel of low return leading edge shot 2 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 18 10 1 0 317 20 shot2_rx_lead_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the leading edge shot 2, low return pulses. If less than 10 returns collected then unused item slots are 0. 19 10 1 0 337 20 shot2_rx_lead_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the leading edge shot 2, low return pulses. If less than 10 returns collected then unused item slots are 0. 20 10 1 0 357 10 shot2_rx_trail_id 1 1 UnsignedByte 1 Identifies channel of low return trailing edge shot 2 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 21 10 1 0 367 20 shot2_rx_trail_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the trailing edge minus the coarse time counts of the leading edge shot 2 low return pulses. If less than 10 returns collected then unused item slots are 0. 22 10 1 0 387 20 shot2_rx_trail_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the trailing edge shot 2, low return pulses. If less than 10 returns collected then unused item slots are 0. 23 10 1 0 407 10 shot2_rx_valid_return 1 1 UnsignedByte 1 Flag whether the shot 2 returns are valid. Valid returns are defined as having the same non-zero lead and trail ID value. =1 valid, =0 invalid. 24 10 1 0 417 10 shot3_rx_lead_id 1 1 UnsignedByte 1 Identifies channel of low return leading edge shot 3 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 25 10 1 0 427 20 shot3_rx_lead_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the leading edge shot 3, low return pulses. If less than 10 returns collected then unused item slots are 0. 26 10 1 0 447 20 shot3_rx_lead_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the leading edge shot 3, low return pulses. If less than 10 returns collected then unused item slots are 0. 27 10 1 0 467 10 shot3_rx_trail_id 1 1 UnsignedByte 1 Identifies channel of low return trailing edge shot 3 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 28 10 1 0 477 20 shot3_rx_trail_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the trailing edge minus the coarse time counts of the leading edge shot 3 low return pulses. If less than 10 returns collected then unused item slots are 0. 29 10 1 0 497 20 shot3_rx_trail_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the trailing edge shot 3, low return pulses. If less than 10 returns collected then unused item slots are 0. 30 10 1 0 517 10 shot3_rx_valid_return 1 1 UnsignedByte 1 Flag whether the shot 3 returns are valid. Valid returns are defined as having the same non-zero lead and trail ID value. =1 valid, =0 invalid. 31 10 1 0 527 10 shot4_rx_lead_id 1 1 UnsignedByte 1 Identifies channel of low return leading edge shot 4 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 32 10 1 0 537 20 shot4_rx_lead_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the leading edge shot 4, low return pulses. If less than 10 returns collected then unused item slots are 0. 33 10 1 0 557 20 shot4_rx_lead_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the leading edge shot 4, low return pulses. If less than 10 returns collected then unused item slots are 0. 34 10 1 0 577 10 shot4_rx_trail_id 1 1 UnsignedByte 1 Identifies channel of low return trailing edge shot 4 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 35 10 1 0 587 20 shot4_rx_trail_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the trailing edge minus the coarse time counts of the leading edge shot 4 low return pulses. If less than 10 returns collected then unused item slots are 0. 36 10 1 0 607 20 shot4_rx_trail_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the trailing edge shot 4, low return pulses. If less than 10 returns collected then unused item slots are 0. 37 10 1 0 627 10 shot4_rx_valid_return 1 1 UnsignedByte 1 Flag whether the shot 4 returns are valid. Valid returns are defined as having the same non-zero lead and trail ID value. =1 valid, =0 invalid. 38 10 1 0 637 10 shot5_rx_lead_id 1 1 UnsignedByte 1 Identifies channel of low return leading edge shot 5 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 39 10 1 0 647 20 shot5_rx_lead_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the leading edge shot 5, low return pulses. If less than 10 returns collected then unused item slots are 0. 40 10 1 0 667 20 shot5_rx_lead_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the leading edge shot 5, low return pulses. If less than 10 returns collected then unused item slots are 0. 41 10 1 0 687 10 shot5_rx_trail_id 1 1 UnsignedByte 1 Identifies channel of low return trailing edge shot 5 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 42 10 1 0 697 20 shot5_rx_trail_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the trailing edge minus the coarse time counts of the leading edge shot 5 low return pulses. If less than 10 returns collected then unused item slots are 0. 43 10 1 0 717 20 shot5_rx_trail_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the trailing edge shot 5, low return pulses. If less than 10 returns collected then unused item slots are 0. 44 10 1 0 737 10 shot5_rx_valid_return 1 1 UnsignedByte 1 Flag whether the shot 5 returns are valid. Valid returns are defined as having the same non-zero lead and trail ID value. =1 valid, =0 invalid. 45 10 1 0 747 10 shot6_rx_lead_id 1 1 UnsignedByte 1 Identifies channel of low return leading edge shot 6 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 46 10 1 0 757 20 shot6_rx_lead_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the leading edge shot 6, low return pulses. If less than 10 returns collected then unused item slots are 0. 47 10 1 0 777 20 shot6_rx_lead_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the leading edge shot 6, low return pulses. If less than 10 returns collected then unused item slots are 0. 48 10 1 0 797 10 shot6_rx_trail_id 1 1 UnsignedByte 1 Identifies channel of low return trailing edge shot 6 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 49 10 1 0 807 20 shot6_rx_trail_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the trailing edge minus the coarse time counts of the leading edge shot 6 low return pulses. If less than 10 returns collected then unused item slots are 0. 50 10 1 0 827 20 shot6_rx_trail_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the trailing edge shot 6, low return pulses. If less than 10 returns collected then unused item slots are 0. 51 10 1 0 847 10 shot6_rx_valid_return 1 1 UnsignedByte 1 Flag whether the shot 6 returns are valid. Valid returns are defined as having the same non-zero lead and trail ID value. =1 valid, =0 invalid. 52 10 1 0 857 10 shot7_rx_lead_id 1 1 UnsignedByte 1 Identifies channel of low return leading edge shot 7 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 53 10 1 0 867 20 shot7_rx_lead_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the leading edge shot 7, low return pulses. If less than 10 returns collected then unused item slots are 0. 54 10 1 0 887 20 shot7_rx_lead_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the leading edge shot 7, low return pulses. If less than 10 returns collected then unused item slots are 0. 55 10 1 0 907 10 shot7_rx_trail_id 1 1 UnsignedByte 1 Identifies channel of low return trailing edge shot 7 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 56 10 1 0 917 20 shot7_rx_trail_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the trailing edge minus the coarse time counts of the leading edge shot 7 low return pulses. If less than 10 returns collected then unused item slots are 0. 57 10 1 0 937 20 shot7_rx_trail_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the trailing edge shot 7, low return pulses. If less than 10 returns collected then unused item slots are 0. 58 10 1 0 957 10 shot7_rx_valid_return 1 1 UnsignedByte 1 Flag whether the shot 7 returns are valid. Valid returns are defined as having the same non-zero lead and trail ID value. =1 valid, =0 invalid. 59 10 1 0 967 10 shot8_rx_lead_id 1 1 UnsignedByte 1 Identifies channel of low return leading edge shot 8 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 60 10 1 0 977 20 shot8_rx_lead_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the leading edge shot 8, low return pulses. If less than 10 returns collected then unused item slots are 0. 61 10 1 0 997 20 shot8_rx_lead_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the leading edge shot 8, low return pulses. If less than 10 returns collected then unused item slots are 0. 62 10 1 0 1017 10 shot8_rx_trail_id 1 1 UnsignedByte 1 Identifies channel of low return trailing edge shot 8 if valid. =0 no return, =1 channel 1, =2 channel 2, =4 channel 3. 63 10 1 0 1027 20 shot8_rx_trail_time_coarse 1 1 UnsignedMSB2 2 Coarse time counts of the trailing edge minus the coarse time counts of the leading edge shot 8 low return pulses. If less than 10 returns collected then unused item slots are 0. 64 10 1 0 1047 20 shot8_rx_trail_time_fine 1 1 UnsignedMSB2 2 Fine time counts of the trailing edge shot 8, low return pulses. If less than 10 returns collected then unused item slots are 0. 65 10 1 0 1067 10 shot8_rx_valid_return 1 1 UnsignedByte 1 Flag whether the shot 8 returns are valid. Valid returns are defined as having the same non-zero lead and trail ID value. =1 valid, =0 invalid. mlasci1206111505.lbl 0 PDS3 Original PDS3 label Carriage-Return Line-Feed