Boca HOME OFFICE Podręcznik Użytkownika Pobierz pdf (Strona 36)

HOME/OFFICE MODEM

Note on Flow Control. XON/XOFF is a software-based flow control

method, using standard ASCII control characters to pause or resume

data transmission. RTS/CTS pacing, a hardware-based method, uses

an electrical signal. Signals are exchanged as follows:

RECEIVER TRANSMITTER

CTS ON START SENDING

CTS ON RTS ON (ready to send)

CTS OFF RTS OFF (stop sending)

Command Description

Select pulse dial make/break ratio

AT&P0 Selects a make/break ratio of 39/61 at 10pps.

US andCanada. (default)

AT&P1 Selects a make/break ratio of 33/67 at 10pps.

UK and Hong Kong.

AT&P2 Same as 0 except at 20pps.

AT&P3 Same as 1 except at 20pps.

Asynchronous mode

AT&Q0 Direct Asynchronous mode.

AT&Q5 Modem negotiates an error-corrected link.

(default)

AT&Q6 Selects asynchronous operation in normal mode

(i.e. speed buffering).

RTS/CTS (Request to Send/Clear to Send)

AT&R0 Not supported.

AT&R1 CTS will drop if required by flow control (default).

Data Set Ready (DSR) signal

AT&S0 Causes DSR signal to be active at all times.

(default)

AT&S1 Causes DSR signal to be active according to the

CCITT specification.

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Boca HOME OFFICE Podręcznik Użytkownika Strona 36