User guide

Appendices 73

Basic modem result codes

There are basic codes the modem will issue in response to processing an AT command. Result

codes may be displayed either in word (V1) or numeric (V0) format by using the Vn command.

The Qn command controls if result codes are issued (Q0) or not issued (Q1). The Xn, Wn

commands and register S95 determines which result code format the modem will display to

indicate the type of connection established. There are more than 300 codes. The most commonly

used are listed in the table below.

S3 0-127 ASCII 13 Command terminator<CR>.

S4 0-127 ASCII 10 Line feed character.

S5 0-127 ASCII 8 Backspace character.

S6 2-255 Seconds 2 Wait time for dial-tone detection.

S7 1-255 Seconds 50 Wait time for carrier.

S8 0-255 Seconds 2 Pause time for coma in dial string.

S10 1-255 .1sec 14 Loss of carrier to hang up delay.

S11 50-255 .01sec 85 DTMF tone duration.

S12 0-127 1/50 sec 50 Escape code guard time.

S24 0-255 1sec 0 Sleep mode inactivity timer.

S29 0-255 10mS 70 Hook flash dial modifier time.

S30 0-255 10Sec 0 Inactivity disconnect timer.

S95 0 Result code control.

Table D.5: AT S Registers (Continued)

Table D.6: Basic Result Code Listing

Numeric Verbose Description

0 OK The modem has received and acknowledged the command.

1 CONNECT Connection made at 300bps or extended result codes are off

(X0).

2 RING An incoming ring signal has been detected.

3 NO CARRIER This result code reflects either an intended disconnect or a

failure to complete a connection.

4 ERROR An invalid command was issued to the modem.