Reference Information
Modem Reference Information
156 Reference Guide
Command Function (3Com/US Robotics)
&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
&S1 Data Set Ready (DSR) signals that the modem is ready to send data
&Un Set minimum link rate (bps): 0=Variable, 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
&W0 Store user profile 0 to memory
&W1 Store user profile 1 to memory
&Zn=s Store phone number (n= 0,1,2,3)
&Zn? Display phone number
S-Registers (3Com/US Robotics)
Register Function (3Com/US Robotics) Range Default
S0 Number of rings before the modem auto-answers a call (0 means auto-
answer is disabled and manual answer is in effect)
0-255 0 rings
S1 Counts and logs the number of rings 0-255 0 rings
S2 Designates the ASCII character used to indicate an escape character 0-127 43
S3 Designates the ASCII character used for carriage returns 0-127 13
S4 Designates the ASCII character used for line feeds 0-127 10
S5 Designates the ASCII character used for backspaces 0-127 8
S6 Dial tone wait time; if AT command X is set to X2 or X4, the modem
ignores this register and dials as soon as it detects a dial tone (seconds)
2-255 3
S7 Carrier wait time (seconds) 1-255 60
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