Modem

Chapter 4—MODEM AT Commands, S-Registers, Result Codes

Online Connection Commands

The following commands control the conditions of the online connection.

Bn Answer Tone

n = 0, 1, 2, 3, 15, or 16 Default: B1 and B16

The B command selects the frequency the modem uses for its answer tone. (The answer tone is the tone transmitted by the receiving modem to the calling modem, thus initiating the handshake between the two modems.) At higher speeds (2400 bps and above) there is no conflict, because all protocols use the Bell frequency of 2225 Hz. Lower speeds require different frequencies.

B0 selects ITU-T V.22 mode when the modem is at 1200 bps.

B1 selects Bell 212A when the modem is at 1200 bps. This is a default.

B2 deselects the V.23 reverse channel.

B3 is identical to B2 in function. It also deselects the V.23 reverse channel.

B15 selects V.21 when the modem is at 300 bps.

B16 selects Bell 103J when the modem is at 300 bps. This is a default.

Cn Carrier Control

n = 1

Default: C1

The Cn command provides backward compatibility with some data communications software.

C1 enables normal transmit carrier switching.

-CnData Calling Tone

n = 0 or 1 Default: -C0

The data calling tone is a tone of a certain frequency and cadence, as specified in the V.25 standards, which identifies whether it is remote data, fax, or voice. The frequency is 1300 Hz, with a cadence of .5 s on and 2 s off.

-C0disables the V.25 data calling tone. -C1enables the V.25 data calling tone.

FEcho Online Data Characters n = 1

Default: F1

This command determines if the modem echoes data from the DTE. This command provides backward compatibility with some data communications software.

F1 disables online data character echo.

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MultiModemISI Hybrid Series, ISIHI-2S

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Multi Tech Equipment ISIHI-2S manual Online Connection Commands, Bn Answer Tone, Cn Carrier Control, CnData Calling Tone
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