Black Box MD1650A-JP, Reference Manual

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CHAPTER 6: Result Codes
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6. Result Codes
The modem responds to commands from the DTE and to activity on the line by signaling to the DTE in the
form of result codes. The result codes that the modem can send are described in this chapter.
Two forms of each result code are available: long-form (verbose) response and a short-form (terse) response.
The long-form code is preceded and terminated by the sequence < CR>< LF>.
The short-form is terminated by < CR>, only with no preceding sequence.
If result messages are suppressed, nothing is returned to the DTE. The long-form results codes can be modified
by the OEM through the .INF file.
Terse Verbose Description
+F4 +FCERROR High-speed fax data (V.27, V.29, V.33, or V.17) is expected but a V.21 signal
is received.
0 OK Command executed.
1 CONNECT Modem connected to the line. For X command values specifying no speed
reporting, the modem has connected to the line and either the line speed
is 300 bps and is enabled, or the DTE speed is 300 bps and DTE speed
reporting is enabled.
2 RING Ring signal detected. An incoming ring signal is detected on the line. What
qualifies as a ring signal is determined by country-dependent parameters.
3 NO CARRIER Carrier signal lost/not detected. Sent when trying to establish a call if:
1. Ringback is detected and later ceases but no carrier is detected within
the period of time determined by register S7.
2. No ringback detected within the period of time determined by register
S7. Also sent when the modem auto-disconnects due to loss of carrier.
For X0, sent for the following conditions:
1. If busy tone detection is enforced, busy/circuit-busy has been detected.
2. If dial tone detection is enforced or selected, dial tone has not been
detected.
4 ERROR Invalid command. Sent during an attempt to execute a command line if
any of the following conditions occur:
1. Command line contains a syntax error.
2. Modem cannot execute a command contained in the command line;
that is, the command does not exist or is not supported.