AT Commands

Bn Communication standard setting

This command determines the communication standard CCITT or Bell. B0 Selects CCITT V.22 mode when the modem is at 1200 bps. B1 Selects Bell 212A when the modem is at 1200 bps (default). B15 Selects V.21 when the modem is at 300 bps.

B16 Selects Bell 103J when the modem is at 300 bps (default). Result Codes:

OK n=0,1,15,16 ERROR Otherwise

Dn Dial

This command instructs the modem to dial a telephone number. Enter n (the telephone number and any modifiers) after the ATD command.

Any digit or symbol (0-9, *, #, A, B, C, D) may be dialed as touch-tone digits. Characters such as spaces, hyphens, and parentheses do not count. They are ignored by the modem, but you may want to include them to make the number and modifiers easier to read.

The following may be used as phone number modifiers:

PPulse dialing.

TTouch-tone dialing (default).

,Pause during dialing. Pause for time specified in Register S8 before processing the next character in the dial string.

WWait for dial tone. Modem waits for a second dial tone before processing the dial string.

@Wait for quiet answer. Wait for five seconds of silence after dialing the number. If silence is not detected, the modem sends a NO ANSWER result code back to the caller.

!Hook flash. Causes the modem to go on-hook for 0.5 seconds and then return to off-hook.

;Return to command mode. Causes the modem to return to command mode after dialing a number, without disconnecting the call.

S=n Dial a telephone number previously stored using the &Zn=X command (See &Zn=X command for more information). The range is 0-3.

En Echo command

This command controls whether or not the characters entered from your computer keyboard are displayed on your monitor (echoed) while the modem is in command mode.

E0 Disables echo to the computer.

E1 Enables echo to the computer (default).

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User’s Manual

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Toshiba U200 user manual Bn Communication standard setting, Dn Dial, En Echo command
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U200 specifications

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