The PWR/RDY LED also alternates rapidly between red and yellow while the device is in network configuration mode. At other times, the PWR/RDY LED blinks slowly in a recognizable pattern to alert you of internal errors. Use the following steps to interpret and record the pattern that the PWR/RDY LED flashes, and then contact National Instruments.

Note  By recording the PWR/RDY LED error messages before calling National Instruments, you can save yourself time, and customer support can answer your questions more accurately and efficiently. Do not switch off power to your serial ENET before recording the flashing PWR/RDY LED pattern.

PWR/RDY LED signaling can report up to 81 different errors. The errors are numbered from 11 to 99 and are reported through sequences of PWR/RDY LED flashes.

Note  There is no zero in any error message. This means that error message numbers 0–10, 20, 30, 40, 50, 60, 70, 80, and 90 are not possible.

Step 1. Count the Long Flashes

A three-second interval, during which the PWR/RDY LED is yellow, separates each repetition of the sequence. The sequence begins with a series of long one-second flashes—that is, one second red, one second yellow. These long flashes represent the digit in the tens column. There can be one to nine long flashes, which represent digits 1 through 9. For example, one long flash represents the digit 1 in the tens column, and nine long flashes represent the digit 9 in the tens column.

Step 2. Count the Short Flashes

The long flashes are followed by shorter flashes; each short flash lasts about one-fifth of a second—that is, one-fifth of a second red, one-fifth of a second yellow. These short flashes represent the digit in the ones column. Again, there can be one to nine flashes, which represent the digits 1 through 9. For example, one short flash represents the digit 1 in the ones column, and nine short flashes represent the digit 9 in the ones column.

Using this method, the PWR/RDY LED flashes the following sequence to represent error message 11:

<three seconds yellow> <one long red flash> <one short red flash> <three seconds yellow>...

The PWR/RDY LED flashes the following sequence to represent error message 31:

<three seconds yellow> <three long red flashes> <one short red flash> <three seconds yellow>...

Step 3. Record Your Error Message Number

When you have computed your error message number, write it down and also note the ON/OFF state of the LINK, TX, and RX LEDs. Have this information available when calling National Instruments.