User's Manual

Appendix A Hayes AT Commands
Man_455U-D Rev 3.01 Page 75
AT&T Self Tests. Allows in-field diagnostics, and factory testing. Tests time out after
the period configured in S-Register S8 (if not zero).
&T0 Stop Tone reversals (See T1 to T4 below).
&T1 Transmit tones Modulated at 200 Hz
&T2 Transmit tones Modulated at 2400 Hz
&T3 Transmit Tones Unmodulated
&T4 Transmit Random Modulated tones at current radio baud rate
&T5 RSSI Measurement. Monitors the received signal strength, and displays in dBm.
AT&V View Current Configuration – List the value of all settings as well as S-Registers
(except &P settings).
&V0 Same as AT&V
&V1 Only show settings that are different from the defaults.
&V2 Show all settings, including extra debug registers.
&V10 View configuration in non-volatile memory
&V11 As for V1, but configuration in non-volatile memory
&V12 As for V2, but configuration in non-volatile memory
AT&U Set modem’s Unit Address Range 0-127. Default 1. The Unit address is used to
identify the module in the system. It should always be set to a unique number
within the modems in the system. This address is also used to access to the
module using the remote diagnostics protocol.
AT&W Write Current Configuration to non-volatile storage
AT&Z Stored Numbers – Up to 4 stored numbers, also “Auto Connect” number for
leased-line mode.
Format: “AT&Zx=nn,nn,nn,nn”. “x” = 0 to 3. “nn” = 1 to 127. Z0 is used for the
autoconnect number.
Z0 contains the autoconnect number for the RS232 port (If Fixed line &L1 is
selected)
Z3 contains the destination addressing for the RS485 port.
AT\B Generate Break signal at remote modem. (Currently not implemented)
\Bn “n” is the break length in units of 0.1 seconds.
AT\C Radio Frequency Increment (Can only be set when #R Password entered)
\C5 Set Radio frequency increment to 5.00 kHz.
\C6 Set Radio frequency increment to 6.25 kHz.
AT\N Radio Bandwidth (Can only be set when #R Password entered)
\N1 Set Radio to 2400 HZ bandwidth.