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Chapter 3 – Supported GSM/WCDMA AT Commands
High Speed HSPA-H4 AT Commands Reference Guide (Document S000483A) 131
+CREG Network Registration
Description: This command is used by the application to ascertain the registration status of the product.
Syntax:
Command Responses
Action Command:
AT+CREG=<mode>
OK
For <stat≠3>: Nominal Case
Read Command:
AT+CREG?
+CREG: <mode>, <stat> [ ,<lac>,<ci>]
OK
For <stat=3>: Specific Case
Read Command:
AT+CREG?
+CREG: <mode>, <stat> [ ,<rejectCause>]
OK
Test Command:
AT+CREG=?
+CREG: (list of supported <mode>s)
OK
Unsolicited Response for <stat≠3> Nominal Case: +CREG: <stat> [ ,<lac>,<ci>]
Unsolicited Response for <stat=3> Specific Case: +CREG: <stat> [ ,<rejectCause>]
Values: <mode> Request Operation
0 Disable network registration unsolicited result code (default)
1 Enable network registration code result code +CREG: <stat>
2 Enable network registration and location information unsolicited result code
+CREG: <stat>,<lac>,<ci> if there is a change of network cell.
<stat> Network Registration State
0 Not registered, Mobile Equipment is not currently searching for a new operator.
1 Registered, home network.
2 Not registered, Mobile Equipment currently searching for a new operator to
register to.
3 Registration denied.
4 Unknown.
5 Registered, roaming.
<lac> Location Area Code
String type; two byte location area code in hexadecimal format (e.g., “00C3”
equals 195 in decimal).
<ci> Cell ID
String type; two byte cell ID in hexadecimal format.
<rejectCause> Network Registration Denied Cause
0 Illegal Mobile Station
1 Illegal Mobile Equipment
2 IMSI unknown
3 Bad network authentication
Parameter Storage: The <mode> parameter is stored in EEPROM using the AT&W command. The
default value can be restored using AT&F.
Examples:
Command Responses
AT+CREG?
+CREG: <mode>,<stat>
OK
AT+CREG=0
Note: Disable network registration unsolicited result code
OK
Note: Command valid
AT+CREG=1
Note: Enable network registration
OK
Note: Command valid
AT+CREG=2
Note: Enable network registration unsolicited result code
registration
OK
Note: Command valid
- HSPA-H4 AT Commands 1
- Contents 3
- Chapter 1 – Introduction 7
- This Document 10
- Chapter 2 – Modem-Specific 15
- Commands 15
- Technologies 17
- !RESET Reset the Modem 26
- !GRESET Reset the Modem 26
- Diagnostic Command 40
- SIM Commands 41
- Chapter 3 – Supported 43
- GSM/WCDMA 3G AT Commands 43
- &S Set DSR Signal 44
- &T Auto-Tests 45
- • For <n> = 0 or 1 46
- • For <n> = 2 46
- +IPR Set Fixed DTE Rate 53
- A Answer Incoming Call 54
- D Dial 54
- E Echo 56
- Completion 59
- Modifier Is Used 59
- T Select Tone Dialing 60
- Supported 27.005 Commands 62
- +CMGC Send an SMS 63
- +CMGD Delete Message 64
- +CMGF Message Format 65
- +CMGL List Messages 65
- +CMGR Read Message 67
- +CMGS Send Message 69
- +CCFC Call Forwarding 83
- +CCUG Closed User Group 84
- +CCWA Call Waiting 85
- Syntax: 86
- Command Responses 89
- Command Responses 96
- +CHUP Hang Up Call 102
- +CIMI Request IMSI 102
- +CIND Indicator Control 103
- +CLCK Facility Lock 104
- +CNUM Subscriber Number 112
- +CPIN Enter PIN 125
- +CPWD Change Password 128
- +CSIM Generic SIM Access 135
- +CSQ Signal Quality 136
- D V.25 Dial Command 139
- / Channel Lists 140
- Appendix B – HSDPA / HSUPA 142
- Categories 142
- Appendix C – ASCII Table 143
- Index 144
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