Lenovo ThinkPad T520i (English) User Guide - Page 80
&C, &C, &D, &D
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Table 3. Modem command list (continued) Command Description Syntax X Extended Result Codes X &C RLSD Behavior &C[] &D DTR Behavior &D[] 62 User Guide Values 0: CONNECT result code is given upon entering online data state. Dial tone and busy detection reporting are disabled. 1: CONNECT result code is given upon online data state. Dial tone and busy detection reporting are disabled. 2: CONNECT result code is given upon entering online data state. Dial tone detection reporting is enabled, and busy detection reporting is disabled. 3: CONNECT result code is given upon entering online data state. Dial tone detection reporting is disabled, and busy detection reporting is enabled. 4: CONNECT result code is given upon entering online data state. Dial tone and busy detection reporting are both enabled. 0: RLSD is always ON. 1: RLSD follows the state of the carrier. 0: Modem ignores DTR. 1: Upon an on-to-off transition of DTR, the modem enters online command state and issues an OK result code; the call remains connected. 2: Upon an on-to off transition of DTR, the modem instructs the underlying modem to perform an orderly cleardown of the call. The disposition of any data in the modem pending transmission to the remote modem is controlled by the +ETBM parameter; otherwise, this data is sent before the call is cleared, unless the remote modem clears the call first (in which case pending data is discarded). The modem disconnects from the line. Automatic answer is disabled while DTR remains off.