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Modem Reference Information
132 Reference Guide
Command Function (3Com)
&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)
Register Function (3Com) 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
S8 Pause in dialing time (comma in dialing string) (seconds) 0-255 2
S9 Carrier detect validation time (1/10 second) 1-255 6
S10 Delay time between lost carrier and hang up; if S10=255, the modem
will not hang up when the carrier is lost; dropping DTR hangs up the
modem (1/10 second)
1-255 7
S11 Duration of the touchtone dialing tone spacing (in milliseconds) 50-255 70
S12 Guard time for the escape code (1/50 second) 0-255 1
S13 Bitmapped register.
1=Reset on DTR loss
2=Reduced non-ARQ transmit buffer
4=Set DEL=backspace
8=Do DS0 on DTR
16=Do DS0 on Reset
128=Escape code hangup
0-255 0
S15 Bitmapped register.
1=MNP/V.42 disabled in V.22
2=MNP/V.42 disabled in V.22bis
4=MNP/V.42 disabled V.32, V.34
8=Disable MNP handshake
16=Disable MNP level 4
32=Disable MNP level 3
64=Unusual MNP incompatibility
128=Disable V.42
136=Disable V.42 detection phase
0-255 0
S16 Bitmapped test register. 2=Dial test 2 0