How to Evaluate Roaming SIM card using a Siretta Modem

Applicable Products

Part number	Description
ZETA-GEP-LTE4 (EU)	Low Power LTE Cat 4 European Modem with GPIO and GNSS
ZETA-G-GPRS (GL)	Entry Level GPRS Modem with GNSS
ZETA-N2-GPRS (GL)	Entry Level GPRS Modem
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

Resources Used

• A PC with an installed Terminal Emulator program.
• Roaming SIM card.
• ZETA-GEP-LTE4 (EU) – with accessory kit (Although any listed ZETA starter kit is compatible).
• AT Command Reference Manual for ZETA-xxP-LTE1 / ZETA-xxP-LTE4
• Initial Modem Setup Guide Application Note
• ZETA-xxP Quick Start Guide

Demonstration of Solution

1. Refer to the ZETA-xxP Quick Start Guide for initializing the modem and establishing a connection with Tera Term.
2. Follow the Initial Modem Setup Guide Application Note up until ‘Commands for Basic Operation’. Ensure that a roaming SIM card is used.
3. Verify the network registration state by executing the AT command: AT+CREG?
4. The modem will respond with one of the following when registered:
5. +CREG: 0,1 – Registered to a home network
6. +CREG: 0,2 – Not registered, but is currently searching for an operator to register to
7. +CREG: 0,3 – Registration denied
8. +CREG: 0,5 – Registered to a roaming network

COM30 – Tera Term VT

File    Edit     Setup     Control     Window     Help

AT+CREG? +CREG: 0,5   OK

5. Confirm that the device returns +CREG: 0,5 or +CREG: 0,1.

Testing the SIM card on 2G (GSM) networks

1. Issue the AT command AT+WS46=12 to set the modem to 2G (GSM).

COM30 – Tera Term VT

File    Edit     Setup     Control     Window     Help

AT+WS46=12 OK

2. Receive OK when successful.
3. Check the availability of 2G (GSM) networks by using the AT command AT+COPS=?

COM30 – Tera Term VT

File    Edit     Setup     Control     Window     Help

AT+COPS=? +COPS: (1,”02-UK”,”02- UK”,”23410”,0), (2,”EE”,”EE”,”23430”,0), (1,” Vodafone UK”,”voda UK”,”23415”,0,,(0,1,2,3,4),(0,1,2)   OK

4. The modem will return the names of the available networks, in this case:
• “O2 – UK”
• “EE”
• “Vodafone UK”

Connect device to O2-UK network.

1. Issue the AT command AT+COPS=1,0,” O2 – UK” or alternatively, AT+COPS=1,0,”23410″ to connect to “O2 – UK”.
2. Receive OK when successful.
3. Check what network the device is registered to using AT+COPS?
4. Confirm that the device is registered to “O2 – UK”.
5. Issue the AT command AT#MONI to get more details of the connected cell.

COM30 – Tera Term VT

File    Edit     Setup     Control     Window     Help

AT+COPS=1,0,” O2 – UK” OK   AT+COPS? +COPS: 1,0,” O2-UK”,0   OK AT#MONI #MONI: O2-UK BSIC:51 RxQual:7 LAC:5508 Id:5CEO ARFCN:118 PWR: -74dbm TA: -1   OK

6. The modem has successfully registered to a “O2 – UK” Network.

Note: To understand the definitions of the responses generated by the AT commands AT#MONI, AT+COPS?, AT+COPS=?, and AT+CREG?, please consult the AT Command Reference Manual.

Connect device to EE network.

1. Issue the AT command AT+COPS=1,0,”EE” or alternatively, AT+COPS=1,0,”23430″ to connect to “EE”
2. Receive OK when successful.
3. Confirm that the device is registered to “EE” using the AT command AT+COPS?
4. Issue the AT command AT#MONI to get more details of the connected cell.

COM30 – Tera Term VT

File    Edit     Setup     Control     Window     Help

AT+COPS=1,0,” EE” OK   AT+COPS? +COPS: 1,0,” EE”,0 OK AT#MONI #MONI: EE BSIC:71 RxQual:7 LAC:07EB Id:2CA3 ARFCN:667 PWR: -86dbm TA: -1   OK

5. The modem has successfully registered to the “EE” Network.

Connect device to Vodafone network.
1. Issue the AT command AT+COPS=1,0,” vodafone UK” or alternatively AT+COPS=1,0,”23415″ to connect to “vodafone UK”
2. Receive OK when successful.
3. Confirm that the device is registered to “Vodafone UK” using the AT command AT+COPS?
4. Issue the AT command AT#MONI to get more details of the connected cell.

COM30 – Tera Term VT

File    Edit     Setup     Control     Window     Help

AT+COPS=1,0,” EE” OK   AT+COPS? +COPS: 1,0,” EE”,0 OK AT#MONI #MONI: EE BSIC:71 RxQual:7 LAC:07EB Id:2CA3 ARFCN:667 PWR: -86dbm TA: -1   OK

5. The modem has successfully registered to an “EE” Network.

Connect device to Vodafone network.

1. Issue the AT command AT+COPS=1,0,” vodafone UK” or alternatively AT+COPS=1,0,”23415″ to connect to “vodafone UK”
2. Receive OK when successful.
3. Confirm that the device is registered to “Vodafone UK” using the AT command AT+COPS?
4. Issue the AT command AT#MONI to get more details of the connected cell.

COM30 – Tera Term VT

File    Edit     Setup     Control     Window     Help

AT+COPS=1,0,” vodafone UK” OK   AT+COPS? +COPS: 1,0,” vodafone UK”,0 OK AT#MONI #MONI: vodafone UK BSIC:52 RxQual:5 LAC:0025 Id:303A ARFCN:4 PWR: -83dbm TA: -1   OK

6. The modem has successfully registered to the “Vodafone” Network.
off

Testing the SIM card on 3G (UMTS) networks

1. Issue the AT command AT+WS46=22 to set the modem to 3G (UMTS).
2. Receive OK when successful.
3. Check the availability of 3G networks by using the following AT command: AT+COPS=?

COM30 – Tera Term VT

File    Edit     Setup     Control     Window     Help

AT+WS46=22 OK AT+COPS=? +COPS: (0,”3 UK”,”3 UK”,”23420”,2), (0,” vodafone UK”,” voda UK”,”23415”,2), (0,”02-UK”,”02-UK”,”23410”,2), (0,”EE”,”23430”,2) … (0,1,2,3,4), (0,1,2)   OK

1. The modem will return the names of the available networks, in this case:
• “3 UK”
• “Vodafone UK”
• “O2 – UK”
• “EE”
2. Repeat the previously outlined steps to connect to “3 UK”, “Vodafone UK”, “O2 – UK” and “EE”.

Testing the SIM card on 4G (LTE) networks

1. Issue the AT command AT+WS46=28 to set the modem to 4G (LTE).
2. Receive OK when successful.
3. Check the availability of 4G networks by using the following AT command: AT+COPS=?

COM30 – Tera Term VT

File    Edit     Setup     Control     Window     Help

AT+WS46=28 OK AT+COPS=? +COPS: 0,0,”EE”,7   OK

1. The modem will return the names of the available networks, in this case:
• “EE”
2. Repeat the previously outlined steps to connect the device to the EE network.

Note: Please refer to the application note titled “How to Send and Receive SMS Messages Using a Siretta Industrial Modem” for guidance on testing the SMS functionality of the roaming SIM card.

Additional Reading

Description	Author
AT command reference manual	Telit
How to Send and Receive SMS Messages Using a Siretta Industrial Modem	Siretta
Understanding MCC, MNC and Network Names Application Note	Siretta
Tera Term download	OSDN
ZETA-xxP Quick Start Guide	Siretta