Gee I thought my Developers Group information was forgotten. 😀 The viewer output.
Shows the PLM being told to send a command to the RemoteLinc's ID and the PLM acknowledged the request as a valid command and it was sent. It does not show any returned message from the RemoteLinc back to the PLM. Looks like the command for the module to report its Insteon Engine version.
INSTEON Engine Version command (0x0D) will return 0x02 in cmd2 for I2CS.
0x00 = I1 INSTEON device
0x01 = I2 INSTEON device
0x02 = I2CS enabled device
NAK 0xFF = I2CS enabled device and sender ID not in responder dB
Maybe it did not reply, the message was not received by an Insteon RF device [PLM or dual band module], the message was sent to the PLM and it was ignored.
Mine are dead not just problems programming them.