4
The Digital Input board consists of voltage dividers, surge protection, input-to-input isolation, input-to-
ground isolation, and an optocoupler for each digital input. For complete details on this board and its
specifications, see Section 1.1.5.
The Front Panel LED board connects to the CPU board and indicates status of the M9000 module.
This board contains eight LEDs which display solid colors of red, green, or yellow and can also blink or
warble to indicate various states of the M9000 module. Below are the status definitions for the M9000
module:
• ON LINE
This LED indicates the operational status of the M9000 module.
o ●Green:
This indicates a normal condition. The M9000 module processor has booted properly, the
firmware is running, and the configuration file has been successfully applied.
o ●Yellow:
This indicates the M9000 module is in Internal Calibration mode. During this time, the
recording and trigger functions are suspended.
o ●Red:
This indicates an alarm condition. The M9000 module is not recording.
o ●Off:
This indicates an alarm condition. The M9000 module is not recording. It is in the boot-up
process or is powered off (see POWER below).
• TRIGGER
This LED indicates the condition of trigger limits.
o ●Green:
This indicates a trigger condition. A trigger condition means one or more analog
measurements exceeded a trigger limit or one or more digital inputs transitioned to an
abnormal value or state. This LED remains green until the Station-Master computer
requests the triggered data.
o ●Yellow:
This indicates the M9000 module is transferring triggered data to the Station-Master
computer. Once transfer is complete, the LED resets to Off.
o ●Off:
This indicates no trigger conditions are being processed.
• 1PPS
This LED indicates status of the time synchronization.
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