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Chapter 3 - AT Commands
3.6 Modem Response (Result Code) Commands
The MT2834MR6’s modems can give responses to commands. The most common one is OK, but the
modems also can alert you or your software to dial tones, busy signals, connection speeds, and whether the
connection is made with error correction or compression enabled. These responses are called result codes,
and they can be terse or verbose, Multi-Tech or standard, basic or extended.
En Echo Command Mode Characters
n = 0 or 1
Default: E1
Normally, when you type commands on the keyboard, the modem echoes the characters
back to the computer or terminal, which displays them on the monitor. Use the E command
to turn this feature off and on.
E0 disables the echo.
E1 enables the echo.
Qn Result Codes Enable/Disable
n = 0, 1, or 2
Default: Q0
You can use the Q command to enable or disable result codes for applications such as
computer-controlled autodialing. You can also use it to disable responses and echo in
answer mode while leaving originate mode still intelligent; this is called the no response
answer mode of operation.
Q0 (or Q) enables result codes.
Q1 disables result codes for applications such as computer-controlled auto-dialing.
Q2 enables the no response answer mode, which leaves originate mode intelligent
while turning off answer mode responses and echo.
&Qn Result Codes (Multi-Tech or Standard AT)
n = 0 or 1
Default: &Q0
The MT2834MR6 gives you a choice between Multi-Tech result codes and standard AT
command set responses. Multi-Tech result codes give you more information, but some
datacomm programs may not be able to use them, in which case, select the standard result
codes.
&Q0 selects Multi-Tech responses with RELIABLE, LAPM, and COMPRESSED modifiers.
With &Q0, the verbose result code for 14,400 bps is CONNECT 14400 LAPM
COMPRESSED.
&Q1 selects AT responses with no RELIABLE, LAPM, or COMPRESSED modifiers. With
&Q1, the verbose result code for 14,400 bps is CONNECT 14400.