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Chapter 5 – AT Commands, S-Registers, and Result Codes
SocketModem Global MT5634SMI Developer’s Guide 26
Command: En Echo Command Mode Characters
Values: n = 0 or 1
Default: 1
Description: E0 Do not echo keyboard input to the terminal.
E1 Do echo keyboard input to the terminal.
Command: Fn Echo Online Data Characters
Values: n = 1
Default: 1
F0 Enable online data character echo. (Not supported.)
F1 Disable online data character echo (included for backward compatibility with some
software).
Command: Hn Hook Control
Values: n = 0 or 1
Default: 0
Description: H0 Go on-hook (hang up).
H1 Go off-hook (make the phone line busy).
Command: In Information Request
Values: n = 0–5, 9, 11
Default: None
Description: I0 Display default speed and controller firmware version.
I1 Calculate and display ROM checksum (e.g., 12AB).
I2 Check ROM and verify the checksum, displaying OK or ERROR.
I3 Display default speed and controller firmware version.
I4 Display firmware version for data pump (e.g., 94).
I5 Display the board ID: software version, hardware version, and country ID
I9 Display the country code (e.g., NA Ver. 1).
I11 Display diagnostic information for the last modem connection, such as DSP and
firmware version, link type, line speed, serial speed, type of error correction/data
compression, number of past retrains, etc.
Command: Mn Monitor Speaker Mode
Values: n = 0, 1, 2, or 3
Default: 1
Description: M0 Speaker always off.
M1 Speaker on until carrier signal detected.
M2 Speaker always on when modem is off-hook.
M3 Speaker on until carrier is detected, except while dialing.
Command: Nn Modulation Handshake
Values: n = 0 or 1
Default: 1
Description: N0 Modem performs handshake only at communication standard specified by S37 and the
B command.
N1 Modem begins handshake at communication standard specified by S37 and the B
command. During handshake, fallback to a lower speed can occur.
Command: On Return Online to Data Mode
Values: 0, 1, 3
Default: None
Description: O0 Exit online command mode and return to data mode (see +++AT<CR> escape
sequence ).
O1 Issue a retrain and return to online data mode.
O3 Issue a rate renegotiation and return to data mode.
Command: P Pulse Dialing
Values: P, T
Default: T
Description: Configures the modem for pulse (non-touch-tone) dialing. Dialed digits are pulsed until a T
command or dial modifier is received.
Command: Qn Result Codes Enable/Disable
Values: n = 0 or 1