Reference Information
Modem Reference Information
Corporate Evaluator’s Guide 207
Command Function (3Com/US Robotics)
S$ Display the list of S-register settings
Sr=n Set S-Register “r” to “n”
Sr? Display the value of S-Register “r”
V0 Display result codes in numeric form
V1 Display result codes in verbose form (words)
X0 Report basic call progress result codes, i.e., OK, CONNECT, RING, NO CARRIER, (also, for busy, if
enabled, and dial tone not detected), NO ANSWER and ERROR
X1 Report basic call progress result codes and the connect rates—OK, CONNECT, RING, NO CARRIER
(also, for busy, if enabled, and dial tone not detected), NO ANSWER, CONNECT XXXX and ERROR
X2 Report basic call progress result codes and the connect rates i.e., OK, CONNECT, RING, NO CARRIER
(also, for busy, if enabled), NO DIAL TONE, NO ANSWER, CONNECT XXXX and ERROR
X3 Report basic call progress result codes and connection rate i.e., OK, CONNECT, RING, NO CARRIER, NO
ANSWER, CONNECT XXXX, BUSY and ERROR
X4 Report all call progress result codes and connection rate i.e., OK, CONNECT, RING, NO CARRIER, NO
ANSWER, CONNECT XXXX, BUSY, NO DIAL TONE and ERROR
Y0 On the next reset, use &W0 settings
Y1 On the next reset, use &W1 settings
Y2 On the next reset use, &F0 settings
Y3 On the next reset, use &F1 settings
Y4 On the next reset, use &F2 settings
Z0 Reset the modem according to the settings of ATY
Z1 Reset the modem and use &W0 settings
Z2 Reset the modem and use &W1 settings
Z3 Reset the modem using &F0 settings and load factory default profile 1
Z4 Reset the modem using &F1 settings and load factory default profile 0
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
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