One common reason that would cause a Modbus error: Illegal data value, or the island state or NIM mode does not allow to service the request. is as follows:
If an Advantys STB NIM is powered up with a blank SIM or memory card, this error would occur when downloading a configuration to the NIM. To recover the NIM has to be powered down, the card removed and then powered back up.
Now the SIM card can be inserted, a configuration downloaded and then stored to SIM card.
Legacy KB System (APS) Data: RESL161188 V3.0, Originally authored by MiRo on 09/19/2009, Last Edited by DaSo on 10/17/2013
Related ranges: Modicon STB