AT+i Programmer's Manual - SE Spezial-Electronic AG

AT+i Command Set
If a syntax error is found anywhere in a command line, the remainder of the line is
ignored and the I/ERROR result code returned.
An AT+i command is accepted by iChip once the previous command has been fully
executed, which is normally indicated by the return of an appropriate result code.
1.4 Escape Code Sequence
While the iChip is in Internet mode attending to Internet communications, it is possible to
break into the communications and abort the Internet mode in an orderly manner. This is
achieved by sending the iChip a sequence of three (+) ASCII characters (+++) after a half
second silence period. In response to this, the iChip:
Shuts down Internet communications.
Terminates data transmission to the host.
Performs a software reset.
Responds with an I/ERROR (056) message.
Returns to command mode.
A maximum delay of 10msec may elapse from the time the (+++) escape sequence is sent
until iChip cuts off transmission to the host. The interrupted Internet activity is not
completed. Nevertheless, this is considered to comprise a session. Thus, parameters set
with the (~) character are restored to their permanent value.
1.5 Socket Command Abort
While the iChip is in Internet mode, during a TCP or UDP socket operation, it is possible
to override iChip‘s normal timeout procedure and abort the current socket operation in an
orderly manner. This is achieved by sending the iChip a sequence of three ASCII (-)
characters (---) following a half second silence period. The socket commands to which
this applies are: STCP, SUDP, SSND, and SFSH. When iChip detects the socket abort
command, it aborts the last socket command and returns an I/ERROR following the
STCP and SUDP commands, or I/OK during an SSND or SFSH command.
1.6 Auto Baud Rate Detection
iChip supports auto baud rate detection on the host serial communications line. After
power-up, iChip enters auto baud mode when the BDRF parameter is set to the value ‗a‘.
The AT+iBDRA command forces iChip into auto baud mode while it is already in
operation.
In auto baud mode, iChip expects an A or a character. This is usually the first character
sent, since in command mode a meaningful command is always prefixed by AT+i.
The host may send an a or A to the iChip to allow it to determine the host‘s baud rate. It
may also send a complete AT+i command. In any case, iChip detects the A or a character,
determines the correct baud rate, and configures its serial channel during the stop bit.
Thus, the next character is received by the serial port at the correct baud rate. The A itself
is retained as well. iChip supports auto baud rate detection for the following baud rates:
2400, 4800, 9600, 19200, 38400, 57600, and 115200.
AT+i Programmer‘s Manual Version 8.21 1-2