Chapter 13 – Specific AT Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 122
Scan +WSCAN
Description: This command displays the received signal strength indication (<rssi>) for a specified frequency (in
absolute format). This command is not allowed during communication.
Values: <absolute frequency> frequency in absolute format <rssi>
0 -113 dBm or less
1 -111 dBm
2...30 -109 to -53 dB m
31 -51dBm or greater
99 not kno wn or not detectable
Syntax: Command syntax: AT+WSCAN=<absolute frequency>
Response syntax: +WSCAN: <rssi>
Command Possible responses
AT+WSCAN=50
Note: Request <rssi> of absolute frequency 50
+WSCAN: 23
OK
Note: <rssi> is 23.
AT+WSCAN=1025
Note: Request power of absolute frequency 1025 CME ERROR: 3
Note: 1025 is not a valid absolute frequency
Ring Indicator Mode +WRIM
Description: This command sets or returns the state of the Ring Indicator Mode.
• In up-down RI mode, no pulses are sent before unsolicited AT response, and up-down signals
are sent when receiving an incoming call.
• In pulse RI mode, an electrical pulse is sent on the Ring Indicator signal just before sending any
unsolicited AT response in order not to lose AT responses when client tasks are in sleep state.
Still in RI mode, when receiving incoming calls, electrical pulses are sent on the RI signal.
• Pulse RI Mode + Pulse On Packet Downloaded: based on Pulse RI mode but an electrical pulse
is also sent on the Ring Indicator signal just before sending a downloaded data packet (GPRS or
CSD) if the remote client has dropped down his RTS signal.
Values: <mode>
0 Up-down RI mode
1 Pulse RI mode
2 Pulse RI mode + Pulse on Download ed Pack et
<n> used only in mode RI Pulse + Pulse on Downloaded Packet (<mode>=2).
0 Duration of pulse is 5 μs
1-31 Duration of pulse is n x 30 μs
Important: Pulse duration may be increased by up to 3 ms, due to interrupt processes
overhead.
Note: Remind that this mode corresponds to the case where the remote equipment has dropped its
RTS signal to stop its flow control.
Syntax: Command syntax: AT+WRIM=<n>
Command Possible responses
AT+WRIM=0
Note: Select up-down RI mode OK
Note: up-down RI mode selected
AT+WRIM=1
Note: Select pulse RI mode OK
Note: pulse RI mode selected
AT+WRIM=2,0
Note: Select mode pulse RI on downloaded packet,
pluse duration is 5 μs
OK
Note: mode pulse RI + Pulse on
downloaded packet selected
AT+WRIM=?
Note: Ask the list of possible values +WRIM: (0-2),(0-33)
OK
Note: possible values 0, 1 or 2
AT+WRIM?
Note: Ask the current value +WRIM: 1
OK
Note: current RI mode is pulse RI