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
Demonstration of Solution Resources used for this application note are as follows:
ZETA-NEP-LTE4 (EU) modem (Low Power Modem with RS232 and USB serial): https://www.siretta.com/products/industrial-modems/lte-cat-4-mobile-network/enhanced-lte-cat-4-european-modem-with-gpio/
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)
Data enabled SIM card.
A PC with an installed Terminal Emulator' program: Window 11 Laptop installed with Tera Term used for the purpose of this guide.
AT command reference manual: ZETA-xxP-LTE1 / ZETA-xxP-LTE4 AT Command https://pages.services/pages.siretta.com/zeta-xxp-lte1-zeta-xxp-lte4-at-command-reference-manual/?ts=1658149511127
Setup GPRS Connection Parameters 1. Set extended error messages by using at command below.
COM3 - Tera Term VT
File Edit Setup Control Window Help
AT CMEE=2
OK
2. Set GPRS APN Name by using at command below.
Outgoing Connection (Old Commands - No longer supported). 3. If the sim card requires username and password use below at commands otherwise continue with step 4.
COM3 - Tera Term VT
File Edit Setup Control Window Help
//Set GPRS Username
AT#USERID= APN username
//Set GPRS Password
AT#PASSW= APN password
4. Open GPRS context 1 by using below command.
Note: This will return your ISP assigned IP address as seen below.
COM3 - Tera Term VT
File Edit Setup Control Window Help
AT#GPRS=1
IP: 10.49.78.129
OK
5. Open Socket on Port Number at IP Address (Or URL) using below at command.
COM3 - Tera Term VT
File Edit Setup Control Window Help
AT#SKTD=0,80, www.siretta.com ,0,0
CONNECT
6. If successful, this will return CONNECT.
7. Set protocol using below command.
COM3 - Tera Term VT
File Edit Setup Control Window Help
GET /time.php HTTP/1.1
Host: www.siretta.com
HTTP/1.1 200 OK
Date: Tue, 20 Feb 2024 12:57:53 GMT
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Accept-Encoding
CF-Cache-Status: DYNAMIC
Report-To: { endpoints :[{ url : https:\/\/a.nel.cloudflare.com\/report\/v3?s=fL WGA3KZQXP%2BeD1hmWShzeGB0leN8w= }], group : cf-nel , max_age :604800}
NEL: { success_fraction :0, report_to : cf-nel , max_age :604800}
Server: cloudflare
CF-RAY: 8586eafdfb086627-AMS
alt-svc: h3= :443 ; ma=86400
18
#NITZ: 24/02/20,12:57:53
Outgoing Connection (New Commands) COM3 - Tera Term VT
File Edit Setup Control Window Help
//Set packet size and timeouts on context 1-6
AT#SCFG=1,1,300,90,600,50
OK
COM3 - Tera Term VT
File Edit Setup Control Window Help
//Open GPRS context 1-6 with APN username and APN password
AT#SGACT=1,1, APN Name , APN Password
//This will return your ISP assigned IP address
#SGACT: 10.188.232.13
OK
//Open Socket on Port Number at IP Address
AT#SD=1,0,80, www.siretta.com ,0,0
//If successful this will return CONNECT
CONNECT
//Set protocol
GET /time.php HTTP/1.1
//Request and query time script
Host: www.siretta.com
//If successful this will return #NITZ command as described in the AT manual
#NITZ: yy/mm/dd,hh:mm:ss
HTTP/1.1 200 OK
Date: Tue, 20 Feb 2024 15:08:36 GMT
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Accept-Encoding
CF-Cache-Status: DYNAMIC
Report-To: { endpoints :[{ url : https:\/\/a.nel.cloudflare.com\/report\/v3?s=eE0BEOvB06KrA6
PjmhJPt4xSMv3fCW2Ab2WfsEJrsMEU0Cj4741M1hIW0wGOVHZRqjOfJRKzNHQAJyL2A2ECkIAD
70HPWdUbl4m1AYxrbQg3bFMWVHxE9aK7YH6xOP9V0Kg= }], group : cf-nel , max_age :604800}
NEL: { success_fraction :0, report_to : cf-nel , max_age :604800}
Server: cloudflare
CF-RAY: 8587aa7888906f0b-CDG
alt-svc: h3= :443 ; ma=86400
18
#NITZ: 24/02/20,15:08:36
0
NO CARRIER
//After timeout or ' will return NO CARRIER
// Close GPRS context 1-6
AT#SGACT=1,0
Note: Please note that this script and service provided by Siretta is for test purposes only. Siretta will not guarantee that this service will remain in operation indefinitely into the future. For applications which rely on using this service it is recommended that you maintain and run the script on your own server using the example script provided below.
Example PHP Script
Additional Reading Description Author
Modem Starter Kit- Quick Start Guide: ZETA-xxP Quick Start Guide Siretta
AT command manual
Telit
Initial Modem Setup Guide
Siretta
Link to download Tera Term
https://osdn.net/projects/ttssh2/downloads/68252/teraterm-4.96.exe/
OSDN
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Applicable Products Part number Description 
