CalAmp 819-GPRS series, Руководство пользователя

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001-0003-829 Revision 1
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Serial Interface Control Commands
The AT Commands described in this section allow the external application to determine various
settings related to the modems's serial interface.
Table 9.5: Serial Interface Control Commands
Command Description
AT\Q
Flow control:
0 - Disable flow control
1 - XON/XOFF software flow control
2 - Only CTS by DCE (TA)
3 - RTS/CTS hardware flow control
Recommended for the following procedures: incoming or outgoing data calls,
fax calls, MUX mode. Often, the initialization routine of Fax programs includes
enabling RTS/CTS handshake, eliminating the need to issue AT\Q3 once again.
AT&C
Set circuit Data Carrier Detect (DCD) function mode:
0 - DCD line is always ON
1 - DCD line is ON in the presence of data carrier only
AT&D
Set circuit Data Terminal Ready (DTR) function mode:
0 - TA ignores status of DTR.
1 - ON->OFF on DTR: Change to command mode while retaining the connected
call.
2 - ON->OFF on DTR: Disconnect data call, change to command mode. During
state DTR = OFF auto-answer is off.
AT&S
Set circuit Data Set Ready (DSR) function mode:
0 - DSR line is always ON
1 - TA in command mode: DSR is OFF.
TA in data mode: DSR is ON.
ATE
Enable command echo:
0 - Echo mode off
1 - Echo mode on
AT+ICF
Serial Interface Character Framing:
=5,1 7 bits, even parity, 1 stop bit
=5,0 7 bits, odd parity, 1 stop bit
=2,1 8 bits, even parity, 1 stop bit
=3 8 bits, no parity, 1 stop bit
=2,0 8 bits, odd parity, 1 stop bit
=1 8 bits, no parity, 2 stop bits
AT+IFC
Set Flow Control separately for data directions:
AT+IFC=<TEflowcontrol>, <TAflowcontrol>
TEflowcontrol:
0 - none
1 - XON/XOFF, terminate flow control in the Cellular Engine
2 - RTS line
3 - XON/XOFF, evaluate flow control in the Cellular Engine and pass it through
(over the air) to the opposite TE
TAflowcontrol:
0 - none
1 - XON/XOFF
2 - CTS line