User Manual

73M2901CE AT Command User Guide UG_2901CE_027
14 Rev. 2.0
2.15 O[n] – Return to On-Line
The O[n] command is used to go back on-line when the command state was entered by issuing the +++AT
escape sequence or turning DTR from ON to OFF with the appropriated S-Register setting in effect. The
O[n] command applies only to asynchronous operation.
O0 If you have returned to Command state from Data state without breaking a connection, the O0
command will return you on-line (Data state).
O[1-7] Retrain
O1 Similar to O0, but also causes the modem to initiate an equalizer retrain sequence.
O2 Enables the modem to respond to a remote request for retrain.
O3 Disables the modem to respond to a remote request for retrain (default).
O4 Enables speed negotiation.
O5 Disables speed negotiation (default).
O6 Enables rate change to 1200 bps.
O7 Enables rate change to 2400 bps (default).
Note: If commands O0 or O1 are given to the modem while not connected, it will respond with ERRO R.
2.16 P – Pulse Dial
Causes the modem to pulse dial until tone dialing i s selecte d or the modem is reset.
2.17 Q[n] – Result Codes On/Off
The Q[n] command tells the modem to either report result codes or to remain qui et. Result codes
acknowledge AT commands and call status events. Also refer to the V[n] and X[n] commands.
Q0 Report Result Codes (default).
Q1 S t ay quiet.
2.18 R[n] – Select Data Terminal Ready Option
The R[n] command selects how the Data Terminal Ready (DTR) signal is used by the modem.
R0 – In Asynchronous mode, the modem ignores DTR. (Default)
R1 – Modem assumes the Comman d State when DTR transitions from ON to OFF.
R2 – Modem goes on-hook (hangs up), disa bles the Auto Answer mode, and assumes the Comm and
State when DTR transitions from ON to OFF. Turning DTR back ON will enable auto-Answer
mode.
R3 – Modem is reset when DTR transitions from ON to OFF.
R4 – Enable V.23 Turnaround via DTR (On to Off edge triggered) in Master mode. Turn around is
done via RTS in all other R command settings.
R5 – Power Down with setting DTR high (requires hard reset to resume normal operation).