TRM250 AT Commands

Quectel BG96 AT Commands

Basic / General Commands

Command	Description
AT	Test command. Checks whether the modem is powered and responding to AT commands.
ATI	Displays module identification information, including model and firmware details.
AT+CGMI	Returns the modem manufacturer identification (Quectel).
AT+CGMM	Returns the modem model identification (BG96).
AT+CGMR	Returns the currently installed firmware revision.
AT+CGSN	Returns the modem IMEI number.
AT+QGMR	Returns detailed firmware version and build information.
AT+QCCID	Returns the ICCID (SIM card serial number).
AT+GSN	Alternative command to display the IMEI number.
ATZ	Restores the active profile from non-volatile memory.
AT+QRST=1	Performs a software reset of the modem.
AT&F	Restores factory-default configuration settings.
AT&W	Saves the current configuration to non-volatile memory.
AT&V	Displays current configuration and stored profile settings.
ATE0 / ATE1	Disables or enables command echo on the serial interface.
AT+CMEE=1	Enables numeric CME error reporting.
AT+CMEE=2	Enables verbose CME error reporting with text descriptions.

SIM Card

Command	Description
AT+CIMI	Returns the IMSI (International Mobile Subscriber Identity).
AT+QCCID	Returns the ICCID (SIM card serial number).
AT+CPIN?	Checks SIM card status and whether a PIN is required.
AT+CPIN="1234"	Enters the SIM PIN code.
AT+CPWD="SC","old","new"	Changes the SIM PIN code.
AT+CLCK="SC",2	Queries whether SIM PIN protection is enabled.
AT+QSIMSTAT?	Returns SIM insertion and detection status.
AT+QSIMDET=1,1	Enables SIM hot-plug detection and related notifications.

Network Registration & Status

Command	Description
AT+CREG?	Reports GSM network registration status.
AT+CGREG?	Reports GPRS network registration status.
AT+CEREG?	Reports LTE EPS network registration status.
AT+COPS?	Displays the currently selected network operator.
AT+COPS=?	Scans and lists all available network operators.
AT+COPS=0	Enables automatic operator selection.
AT+COPS=1,2,"26001"	Manually selects a network operator using MCC/MNC.
AT+CSQ	Reports received signal strength and bit error rate.
AT+CESQ	Reports extended radio measurements including RSRP and RSRQ.
AT+QCSQ	Displays technology-specific signal quality information.
AT+QNWINFO	Displays current radio technology, operator and frequency band.
AT+QENG="servingcell"	Displays detailed serving cell information.
AT+QENG="neighbourcell"	Displays neighboring cell information.
AT+CPAS	Returns the current modem activity status.

APN & PDP Context (Data Connection)

Command	Description
AT+CGDCONT?	Lists all configured PDP contexts.
AT+CGDCONT=1,"IP","your.apn"	Configures PDP context 1 for IPv4 operation.
AT+CGDCONT=1,"IPV4V6","your.apn"	Configures PDP context 1 for dual-stack IPv4/IPv6 operation.
AT+CGACT?	Displays active PDP contexts.
AT+CGACT=1,1	Activates PDP context 1.
AT+CGACT=0,1	Deactivates PDP context 1.
AT+CGPADDR=1	Displays the IP address assigned to PDP context 1.
AT+CGCONTRDP=1	Displays dynamic PDP information such as IP address and DNS servers.
AT+CGAUTH=1,1,"user","pass"	Configures PAP/CHAP authentication credentials.
AT+QICSGP=1,1,"apn","user","pass",1	Configures APN and authentication parameters for data services.
AT+QIACT=1	Activates the specified data context.
AT+QIDEACT=1	Deactivates the specified data context.
AT+QIACT?	Displays currently active data contexts and assigned IP addresses.

Network Mode & Band Selection

Command	Description
AT+CFUN?	Displays the current functionality level.
AT+CFUN=0	Sets minimum functionality and disables RF operation.
AT+CFUN=1	Enables full modem functionality.
AT+CFUN=4	Enables flight mode with RF disabled.
AT+CFUN=1,1	Performs a full modem restart.
AT+QCFG="nwscanmode"	Configures radio access technology scanning mode.
AT+QCFG="iotopmode"	Configures LTE-M and NB-IoT operating preference.
AT+QCFG="band"	Configures allowed radio frequency bands.
AT+QCFG="servicedomain"	Configures service domain preferences.
AT+QCFG="roamservice"	Configures roaming behavior.

SMS

Command	Description
AT+CMGF=1	Enables SMS text mode.
AT+CMGS="+37060000000"	Sends an SMS message to the specified number.
AT+CMGL="ALL"	Lists all stored SMS messages.
AT+CMGR=1	Reads the SMS stored at index 1.
AT+CMGD=1	Deletes the SMS stored at index 1.
AT+CNMI=2,1,0,0,0	Enables unsolicited SMS arrival notifications.

Serial / Interface

Command	Description
AT+IPR?	Displays the current UART baud rate.
AT+IPR=115200	Sets the UART baud rate to 115200 bps.
AT+IFC=2,2	Enables RTS/CTS hardware flow control.
AT+CMUX=0	Enables GSM 07.10 multiplexing mode.
AT+QURCCFG="urcport","uart1"	Routes unsolicited result codes to UART1.
AT+QCFG="usbnet"	Configures USB networking mode.

Diagnostics & Debugging

Command	Description
AT+CEER	Displays the reason for the most recent connection or registration failure.
AT+CGCONTRDP=1	Displays dynamic PDP context information including IP and DNS settings.
AT+QENG="servingcell"	Displays detailed serving cell parameters for troubleshooting.
AT+QENG="neighbourcell"	Displays neighboring cell information for radio diagnostics.
AT+QNWINFO	Displays current radio access technology, operator and band information.
AT+QCSQ	Displays detailed signal quality measurements.
AT+QCFG?	Displays Quectel configuration parameters.
AT+QINDCFG?	Displays unsolicited result code configuration.

Note: This document covers only the essential AT commands supported by the device. For the full AT command reference, please contact Quectel directly.