Applicable Products
| Part number | Description |
| ZETA-GEP-LTE4 (EU) | Low Power LTE Cat 4 European Modem with GPIO and GNSS |
| ZETA-G-GPRS | Entry Level GPRS Modem with GNSS (GL) |
| ZETA-N2-GPRS | Entry Level GPRS Modem (GL) |
| ZETA-NEP-LTE4 (EU) | Low Power LTE Cat 4 European Modem with GPIO |
| ZETA-NEP-LTEM (GL) | Low Power Global LTE Cat M Modem with GPIO |
| ZETA-NLP-LTE1 (EU) | Ultra Low Power European LTE Cat 1 Modem |
| ZETA-NLP-LTEM (GL) | Ultra Low Power Global LTE Cat M Modem |
| ZETA-N-LTE (EU) | High Performance LTE Cat 4 Modem with GPIO |
| ZETA-NSP-LTE1 (EU) | Low Power European LTE Cat 1 Modem |
Objective
In a few industrial applications, the user may require a modem to send an SMS to recipient with a cellular handset to receive an alert from a remote system. It may also be necessary for a system capable of processing SMS notification to trigger an automatic response.
This application note shows how to send and receive SMS messages using a Siretta Modem.
Solution
ZETA modem is set to send and receive SMS messages from a specified mobile number and is tested to make sure it communicates with that mobile number.
A typical arrangement is shown below:
Method
Resources used for this application note are as follows:
- ZETA-NLP-LTE1 (EU) modem (Low Power Modem with RS232 and USB serial): Ultra Low Power LTE Cat 1 (EU) – Siretta – Enabling Industrial IoT
- Modem Starter Kit Quick Start Guide: ZETA-xxP Quick Start Guide
- Initial Modem Setup Guide Application Note: Initial Modem Setup Guide App Note – LP (siretta.com)
- An SMS enabled SIM card which has the ability to send and receive SMS Messages
- A PC with an installed ‘Terminal Emulator’ program: Window 10 Laptop installed with Tera Term used for the purpose of this guide.
- AT command reference manual: ZETA-NLP-LTE1 (EU) AT Command Manual
- Cellular Handset for sending and receiving SMS messages.
Note: All Siretta Industrial ZETA modems support SMS messaging services. The SMS messaging service must be enabled by SIM card provider.
1 . Follow the Initial Modem Setup Guide Application Note
2. Check the network registration using AT+CREG?
Receive following when registered to a local network:
+CREG: 0,1
Receive following when registered to a roaming network:
+CREG: 0,5
Note: If you do n.ot receive a 1 or a 5 for the +CREG command, you are not registered on the cellular network and will not be able to send an SMS message.
3 . Issue the following AT command:
AT+CMGF=?
To check supported messaging modes
| COM3 – Tera Term VT |
| File Edit Setup Control Window Help |
| AT+CMGF=?
+CMGF: (0,1)
OK |
Where:
0 is PDU Mode
1 is Text Mode
4. Set Modem to ‘Text’ mode by issuing the following AT command:
AT+CMGF=1
| COM3 – Tera Term VT |
| File Edit Setup Control Window Help |
| AT+CMGF=?
+CMGF: (0,1)
OK AT+CMGF=1 OK
|
Note: The Siretta modem will automatically set its ‘Service Centre Address’
5. You can check the ‘Service Centre Address’ by issuing the following AT command: AT+CSCA?
| COM3 – Tera Term VT |
| File Edit Setup Control Window Help |
| AT+CSCA?
+CSCA: “+447958879879”,145
OK |
Where “145” indicates the international dialling code scheme which contains “+” and UK dialling code. The number “+447958879879” is the mobile phone number with the UK international dialling code for the SIM installed in the modem.
6. Enter the recipient mobile number by using the following AT command.
AT+CMGS=” Mobile Number”
For this guide the mobile number 07776327870 is used
| COM3 – Tera Term VT |
| File Edit Setup Control Window Help |
| AT+CMGS=07776327870
>
|
Receive “>” when successful.
7. Type your SMS message to send after “>”
“This is a test SMS from Siretta ZETA-NLP-LTE1 (EU) reply RECEIVED”.
| COM3 – Tera Term VT |
| File Edit Setup Control Window Help |
| AT+CMGS=07776327870
>This is a test SMS from Siretta ZETA-NLP-LTE1 (EU) reply RECEIVED.
|
8. To send an SMS message press and hold “Ctrl” and press “Z” on the PC keyboard to send a special termination character to the modem.
9. When the SMS has been sent you will see the confirmation and SMS message queue location with the following message:
+CMGS: XXX
| COM3 – Tera Term VT |
| File Edit Setup Control Window Help |
| AT+CMGS=07776327870
>This is a test SMS from Siretta ZETA-NLP-LTE1 (EU) reply RECEIVED. +CMGS:211 OK
|
10. You have now sent an SMS to the mobile number 07776327870.
11. Below is a screenshot from the recipient’s mobile showing the SMS message that has been received.
12. Reply to the SMS with “RECEIVED” from the mobile device to the Siretta ZETA-NLP-LTE1 (EU) modem.
13. To check received the message from the mobile device, input the following AT command AT+CMGL.
| COM3 – Tera Term VT |
| File Edit Setup Control Window Help |
| AT+CMGL
+CMGL: 18, “REC UNREAD”,” +447776327870”,” “,”22/06/07,09:36:27+04”
|
14. View the time-stamped ‘received unread’ SMS message sent from the mobile user.
15. Issue the following AT command to read the new message.
AT+CMGL=”REC READ”
| COM3 – Tera Term VT |
| File Edit Setup Control Window Help |
| AT+CMGL
+CMGL: 18, “REC READ”,” +447776327870”,” “,”22/06/07,09:36:27+04”.
RECEIVED
|
16. You have now received a reply from the mobile phone using the Siretta ZETA-NLP-LTE1 (EU).
17. Issue the following AT command:
AT+CMGL=?
To see the available message options from the Siretta ZETA-NLP-LTE1 (EU).
| COM3 – Tera Term VT |
| File Edit Setup Control Window Help |
| AT+CMGL=?
+CMGL: (“REC READ”,”REC READ”,” STO UNSENT”,” STO SENT”,” ALL”)
OK |
Where:
“REC UNREAD” shows received unread SMS Messages.
“REC READ” shows received read SMS Messages
“STO UNSENT” shows stored unsent Messages
“STO SENT” shows stored sent Messages
“ALL” shows all above SMS Messages
For more information about Siretta’s ZETA Modems product portfolio or to view Siretta’s selection of Industrial modems please visit Industrial Modems – Siretta – Enabling Industrial IoT or alternatively contact your Siretta representative.
Additional Reading
| Description | Author |
| Modem Starter Kit- Quick Start Guide: ZETA-xxP Quick Start Guide | Siretta |
| AT command manual
|
Telit |
|
|
Siretta |
| Link to download Tera Term
https://osdn.net/projects/ttssh2/downloads/68252/teraterm-4.96.exe/ |
OSDN |
