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Modem Reference Information
Reference Guide 131
Command Function (3Com)
Z5 Reset the modem using &F2 settings and load factory default profile 2
$ Display the list of AT commands
&$ Display the list of ampersand commands
&A0 Disable data compression result codes
&A1 Enable data compression result codes
&A2 Enable modulation result codes
&A3 Enable data compression result codes and add V.42bis and MNP 5 protocol indicators
&B0 Use a floating DTE speed
&B1 Use a fixed DTE speed
&B2 Use a fixed DTE speed when using data compression
&C0 Carrier detect is always on
&C1 Carrier detect is controlled by the modem.
&D0 Ignore DTR
&D1 Use online command mode
&D2 DTE controls DTR
&D3 DTE controls DTR and reset
&F0 Set the factory profile that uses hardware (RTS/CTS) flow control (this is the active profile when the modem
is shipped)
&F1 Set the factory profile that uses hardware (RTS/CTS) flow control
&F2 Set the factory profile that uses software (XON/XOFF) flow control
&G0 No guard tone
&G1 Use 550 Hz guard tone
&G2 Use 1800 Hz guard tone
&H0 Flow control for transmitted data - Disable flow control
&H1 Flow control for transmitted data - Enable hardware flow control (RTS/CTS)
&H2 Flow control for transmitted data - Enable software (XON/XOFF)
&H3 Flow control for transmitted data - Enable both software and hardware flow control
&I0 Flow control for received data - Disable flow control
&I1 Flow control for received data - send XON/XOFF signals to modems on both ends
&I2 Flow control for received data - send XON/XOFF signals to your modem only
&I3 HP Eng/Ack in Host mode
&I4 HP Eng/Ack in Terminal Mode
&I5 Flow control for received data - If error correction is used, send XON/XOFF signals to your modem only; if
data compression is not used, look for incoming XON/XOFF
&K0 Disable data compression
&K1 Enable data compression (V.42bis, MNP 5, NONE)
&K2 Enable data compression (forces V.42bis)
&K3 Use selective data compression
&M0 Disable error correction in 1200 bps and faster transfers
&M4 Allow V.42 or MNP error correction in 1200 bps and faster transfers
&M5 Allow either V.42 or MNP error correction in 1200 bps and faster transfers
&Nn Set link speed (bps): 0=Highest speed, 1=300, 2=1200, 3=2400, 4=4800, 5=7200, 6=9600, 7=12000,
8=14400, 9=16800, 10=19200, 11=21600, 12=24000, 13=26400, 14=28800, 15=31200, 16=33600,
17=28000, 18=29333, 19=30666, 20=32000, 21=33333, 22=34666, 23=36000, 24=37333, 25=38666,
26=40000, 27=41333, 28=42666, 29=44000, 30=45333, 31=46666, 32=48000, 33=49333, 34=50666,
35=52000, 36=53333, 37=54666, 38=56000, 39=57333
&R1 Ignore RTS
&R2 Receive to DTE/RTS high
&S0 Data Set Ready (DSR) is always on