Specifications

Chapter 4 – Serial Interface Control Commands
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 52
4.4 AT&S Set Circuit DSR Function Mode
Description: The AT&S command determines how the TA sets circuit 107 Data Set Ready (DSR)
depending on the communication state of the TA interfacing TE.
Exec Command: AT&S<value>
Response: OK
Parameter Description:
<value>
0 DSR line is always ON. Default.
1 TA in command mode: DSR is OFF.
TA in data mode: DSR is ON.
4.5 ATE Enable Command Echo
Description: The ATE command determines whether or not the TA echoes characters received from
TE during command state.
Exec Command: ATE[<value>]
Response: OK
Parameter Description:
<value>
0 Echo mode off. Default.
1 Echo mode on
Note: In case of using the command without parameter, <value> is set to 0.
4.6 AT+ICF Serial Interface Character Framing
Description: The command AT+ICF controls the serial interface character framing format and parity
used for receiving and transmitting. The following settings are supported:
• 7 bits, even parity, 1 stop bit (AT+ICF=5,1)
• 7 bits, odd parity, 1 stop bit (AT+ICF=5,0)
• 8 bits, even parity, 1 stop bit (AT+ICF=2,1)
• 8 bits, no parity, 1 stop bit (AT+ICF=3)
• 8 bits, odd parity, 1 stop bit (AT+ICF=2,0)
• 8 bits, no parity, 2 stop bits (AT+ICF=1)
Test Command Syntax: AT+ICF=?
Response(s): +ICF: (list of supported <format>s), (list of supported <parity>s)
OK
Read Command Syntax: AT+ICF?
Response(s): +ICF: <format>[, <parity>]
OK
Write Command Syntax: AT+ICF=[<format>][, <parity>]
Response(s): OK
ERROR
Parameter Descriptions:
<format>
Specifies the character format used for receiving and transmitting.
1 8 data 0 parity 2 stop
2 8 data 1 parity 1 stop
3 8 data 0 parity 1 stop
5 7 data 1 parity 1 stop
<parity>
Specifies the method of calculating the parity bit, if a parity bit is supported by <format>.
If <format> does not support parity, this parameter has to be omitted.
0 odd
1 even
Notes:
• If AT+ICF modes 7E1 or 7O1 are set, the parity bit will by default not be transmitted over the air. If the remote
party expects the parity bit to be transmitted, additional settings are required via AT^STPB.
• When using a bit rate of 300 bps there must be a delay of 500ms before entering the next command. At bit
rates of 1200 bps the delay must be 300ms. For higher bit rates use of the default delay is sufficient.
• The Multi-Tech wireless modem’s autobaud feature detects the bit rate currently used by the TE. However,
this detection suffers some limitations described in Section 4.9.1, Autobauding. If autobauding is enabled, the
AT+ICF read command does not show the current character framing, but the character framing that will be
used when autobauding is disabled.