Table T3. Explanation of status messages from the combiner/repeater module in the MEG/SAM.
|
Readout
|
Explanation
|
|---|---|
| Internal clock 1,113,125 µs fast | CRM internal clock offset over its reference. In the example, the CRM internal clock advances 1,113,125 µs to the reference. |
| 2000 Aug 5 10:30:00 o/s = -6954782 drift = -68 | Date/time (year month day hour:min:second), the internal clock offset (o/s) in a unit of 25/1536 (= 1000/1024/60) µs in a fraction of a second and the clock drift over a minute in the same unit as the offset. |
| Power 28,103Asecs 18.767Asecs 312mA 7.26W | MEG and OBH power consumption, including ampere seconds since the system was started, ampere seconds, average current, and power consumed in the last minute. |
| Temperature 25.37°C | Temperature in the MEG canister measured on the PDM board. |
| MIN MAX AVG STATUS #Blks #Naks Pkt# Space | The next three lines summarize the status of OBH power and the data link. The first single-digit number in each line indicates the PDM channel that corresponds to the measurement. Channel 0 is dedicated to SWB voltage measurement. Channels 1 and 2 are dedicated to the OBHs. Channels 3, 4, and 5 are available for connection to internal DM24s (not set in this example). |
| 0 23.25V 23.30V 23.27V SWB high 49 0 28 511 | SWB voltages (PDM channel 0) in the last minute, in order of minimum, maximum, and average, respectively. Comparison of these results with thresholds is given as follows: "high" = exceeding the higher threshold, "good" = between the two thresholds, and "low!" = below the lower threshold. The next four readings indicate the number of GCF blocks sent in the last minute, the number of error blocks (NAKs) in the transmission, the last GCF block sequence number, and the available space in the CRM buffer, respectively. |
| 1 136.1mA 144.8mA 140.6mA ON ok 21 0 | One-line summary of supply current and data link status for the first OBH sensor. A one-word diagnosis is given with each measurement similar to the SWB voltage measurement example in channel 0: "ok" = between high (160 mA) and low (40 mA) current thresholds, "low" = below the lower threshold, and "leak?" = higher than the upper threshold. |
| 2 142.8mA 149.1mA 144.7mA ON ok 28 0 | One-line summary of supply current and data link status for the second OBH sensor. |
Notes: CRM = combiner/repeater module, MEG = multiple-access expandable gateway, SAM = storage acquisition module, OBH = ocean borehole seismometer, PDM = power distribution module, SWB = seawater battery system, DM24 = modular digitizer, GCF = Guralp Compressed Format. The SAM status message includes the current measurements of PDM channel 1 (logic supply for the disks), channel 6 (5-V supply for disks), and channel 7 (12-V supply for disks). A status message from the CRM in the SAM includes an additional 100-byte string: Writing 9|3827: Reading 6|4032 Bad Flash 0 1. This line indicates the status of buffer memory: the number of chip and block currently writing and reading and the number of error in writing and reading, respectively.