Multitech MT5600DSVD2, User Manual

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4 AT Commands, S-Registers, and Result Codes
47
S86 decimal 0, 4, 5, 9, n/a When the modem issues a NO CARRIER
12, 13, 14 result code, a value is written to this
register to help determine the reason for
the failed connection.
S86 records the first
event that contributes to a NO CARRIER
message. Use the S86? command to read
the value.
0 Normal disconnect; no error occurred.
4 Loss of carrier.
5 V.42 negotiation failed to detect an
error-correction modem at the other
end.
9 The modems could not find a common
protocol.
12 Normal disconnect initiated by the
remote modem.
13 Remote modem does not respond after
10 retransmissions of the same message.
14 Protocol violation.
Register Unit Range Default Description