Flash Pattern:
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Flash at 1x/sec rate: Normal operation.
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Flash at 3x/sec rate: An SDI2 communication error or the device has nothing programmed to it.
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Steady ON: A trouble condition exists.
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Steady OFF: Module is not powered or some other trouble condition prohibits the module from controlling the heartbeat LED.
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OFF for 3 sec, then flashes: Firmware version. Example; if the Firmware version is 3.2.1, the LED pulses 3 times and pauses for 1 sec, pulses 2 times and pauses for 1 sec, then pulses 1 time. After flashing the Firmware version, the heartbeat LED stays OFF for 3 sec before indicating the module state.