We have designed a product that uses the Digi Connect ME (DCME) to connect via Ethernet. The connections to the DCME are very simple:
3.3V (3.28V tested) to pin 15
GND to pin 16
Serial RXD to pin 7
All 4 mounting posts to GND.
All other pins left disconnected.
When the device is powered on, the green and yellow LEDs flash during diagnosics, then after a few seconds, both LEDs flash on and off at the same rate constantly. I assume this means there is an error although am unsure of what. Also, the device cannot be discovered using the device discovery utility.
Do any of the other pins need to be connected for the device to function? I would assume that the device only needs power and gnd to pins 15 and 16 to function; is this accurate? What do the flashing LEDs mean?
The Amber (yellow) LED is the Ethernet link light and is directly connected to the Ethernet PHY. Under normal operating conditions there is no way that the Connect ME can effect the state of this LED. As for the Ethernet activity LED, it is used for diagnostics messaging during bootup and subsequently control is passed to the PHY for use as activity.
Is this occuring on our provided development board or a board of your design? If this is on your board can we test an ME module off of Digi’s board?
Are you seeing this flashing behavior when the ME is connected to a hub/switch?
Is it connected to a hub or switch?
If it is a switch, is the switch configured for auto detection? Can you reconfigure the ME’s port on that switch to manual and see what happens.
Has Erik has pointed out the error codes outputted on the activity LED are displayed in a three count pattern, i.e. 4-1-1, 9-1-1, etc. These patterns mean something and I can provide these codes meaning.
The fact that the link LED is also blinking would seem indicate that the problem is likely with the module or (if so mounted) with the board you designed.
I understand that you are already working with tech support, so I shall cut my comments off here.