Multitech MULTI MODEM II MT5600BL User Manual page 57

MultiModemII User Guide
Register Unit
S46
S48
S86
4 AT Commands, S-Registers, and Result Codes
Range Default
decimal 136, 138 138
decimal 0, 7, 128 7
decimal 0, 3–23 n/a
Description
Enables or disables data compression:
136 Error correction without compression.
138 Error correction with compression.
Enables or disables LAPM negotiation. An
invalid value is treated as a 128 value.
0 Disables negotiation and proceeds with
LAPM.
7 Enables negotiation.
128 Disables negotiation and proceeds at
once with the fallback action specified
in S36. Can be used to force MNP.
When the modem issues a NO CARRIER
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.
3 Call Waiting caused disconnect.
4 Physical loss of carrier.
5 No error correction at the other end.
6 No response to feature negotiation.
7 This modem is async-only, the other
sync-only.
8 No framing technique in common.
9 No protocol in common.
10 Bad response to feature negotiation.
11 No sync information from remote
modem.
12 Normal disconnect initiated by remote
modem.
13 Remote modem does not respond after
10 retransmissions of the same message.
14 Protocol violation.
15 DTR lost.
15 Three retrains or excessive
retransmissions when no DTR.
16 Received GSTN cleardown.
17 Inactivity timeout.
18 Speed not supported.
19 Long space disconnect.
20 Key abort disconnect.
21 Clears previous disconnect reason.
22 No connection established.
23 Disconnect after three retrains.
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