Datasheet

7. Command Overview 45

AT+CPIN=<n> Enter PIN of the SIM card:

<n> 4 digit number

AT+CREG? Display registration state (network state)

Response: <n>,<stat> OK

<stat> 0 Not registered, no GSM network search

1 Registered at standard provider

2 Not registered, GSM network search

3 Refused

5 Registered, roaming

AT+CSQ Display signal quality (intensity of the GSM signal)

Response: <rssi>,<ber>

<rssi> 0..10 Poor GSM signal, change location

11..31 Good GSM signal

99 Not detectable

7.2.3 AT Commands For SMS

AT+CSCA? Query number of the SMS service center

AT+CSCA=<nr> Set number of the SMS service center

<no> Number in international format (e.g. Germany: +49…)

AT+CMGF? Query SMS message format

AT+CMGF=<n> Set SMS message format

<n> 0 PDU mode – default

1 Text mode

AT+CMGD=<n> Delete SMS message <n> from memory

AT+CMGL=<stat> List SMS message in memory

<stat> 0 unread messages

1 read messages

„ALL“ All messages

AT+CMGR=<n> Read SMS message <n> from memory; the message status <n> changes from

unread to read.

AT+CMGS=<nr>

<Ctrl-Z>

Send SMS Message directly:

<no> Phone number

<CR> Enter/return key

<text> Text of the SMS message

<Ctrl-Z> Press the Ctrl key and Z (0x1A)

The phone number is completed with <CR>, the text with <Ctrl-Z>.

Version 1.00 / 09.04