Silicon Laboratories SI2494/39 T9 Kbps4, T16 Autobaud On4, V0 Report connect and protocol message

AN93

		Table 42. Extended AT\ Command Set (Continued)
Command								Action
\T3	2400 bps
\T4	4800 bps
\T5	7200 bps
\T6	9600 bps
\T7	12.0 kbps3
\T8	14.4 kbps.
\T9	19.2 kbps4
\T10	38.4 kbps
\T11	57.6 kbps
\T12	115.2 kbps
\T13	230.4 kbps
\T14	245.760 kbps3
\T15	307.200 kbps
\T16	Autobaud On4
\T17	Autobaud Off. Lock at current baud rate.
	In UART mode:
	1. Causes a low pulse (25 ms) on				RI	and		DCD
\U	2. Makes	INT	the inverse of ESC
	3. Makes RTS the inverse of CTS
	In parallel or SPI mode, causes a low pulse (25 ms) on								INT.
	This command terminates with			RESET			and does not generate an OK message.
\Vn	Connect message type.
\V0	Report connect and protocol message.
\V2	Report connect message only (exclude protocol message).
\V4	Report connect and protocol message with both upstream and downstream connect rates.

Notes:

1.When in autobaud mode, \B0, \B1, and \P1 is not detected automatically. The combination of \B2 and \P3 is detected. This is compatible with seven data bits, no parity, two stop bits. Seven data bits, no parity, one stop bit may be forced by sending AT\T17\B1.

2.After changing the baud rate, the result code OK is sent at the old DTE rate. Subsequent commands must be sent at the new rate. If the ISOmodem is configured in autobaud mode, AT commands \T0 through \T15 lock the new baud rate and disable autobaud. To eliminate any possibility of a race condition between the receipt of the result code and the changing of the UART speed, CTS is de-asserted while the result code is being sent until after the rate has been successfully changed. The host should send the \T command and wait for the OK response. After OK has been received, the host may send data at the new rate as soon as CTS is asserted. The \T command should be the last command sent in a multi-command line and may not be used on the same command line as :U or :R commands. If it is not, the OK from the \T command is sent at the old DTE rate, and other result codes are sent at the new DTE rate.

3.The autobaud feature does not detect this rate.

4.Default is \T16 if autobaud is selected by reset-strap option; otherwise default is \T9 (19.2 kbps).

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