Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 449)

Short message Commands
New Message Acknowledgement +CNMA
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WM_DEV_OAT_UGD_049 - 001 VOLUME 3 August 23, 2007
Test command
AT+CNMA=?
OK
17.15.3 Parameters and Defined Values
<n>:
type of acknowledgement in PDU mode
0 send RP-ACK without PDU (same as TEXT mode)
1 send RP-ACK with optional PDU message
2 send RP-ERR with optional PDU message
<length>: length of the PDU message
Please refer to GSM 03.40 Recommendation [4] for other PDU
negative acknowledgement codes.
17.15.4 Parameter Storage
None.
17.15.5 Examples
Example of acknowledgement of a new message in TEXT mode:
Command Responses
AT+CSMS=1
Note: SMS AT commands compatible with GSM
07.05 Phase 2 + version [1]
OK
AT+CMGF=1
Note: Set TEXT mode
OK
Note: TEXT mode valid
AT+CNMI=2,2,0,0,0
Note: <mt>=2
OK
+CMT: "123456","98/10/01,12:30
00+00",129,4,32,240,"15379",129,5
Received message
Note: Message received
AT+CNMA
Note: Acknowledge the message received
OK
Note: Send positive acknowledgement to the network
AT+CNMA
Note: Try to acknowledge again
+CMS ERROR: 340
Note: No +CNMA acknowledgment expected