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 To send AT commands (or communicate) to a modem using a PC, the modem's COM ports must be set to enable communication between the two.
A modem's COM ports can be set using a terminal emulator. There are a number of terminal emulators available including, PuTTY, Hyperterminal , RealTerm and TeraTerm. These programs are generally free to download.
Solution This application note is intended to show how to set a modem's COM port to communicate with a PC using Terminal Emulator Program of your choice.
List of Items:
A ZETA modem starter kit (includes power supply and RS232 cable for this application note)
Demonstration of Solution
Turn On the modem and connect it to a PC using the supplied RS232 cable
Open Hyperterminal (or your preferred terminal emulator)
Select new connection
4. Choose the correct COM port
5. Configure the port with the following settings:
Bits per second: 115200
Data bits: 8
Parity: None
Stop bits: 1
Flow control: Hardware
6. Send AT commands to the unit
1. Send AT commands to the unit
COM3 - Tera Term VT
File Edit Setup Control Window Help
AT
OK
AT+GMR
12.00.213
OK
The OK response shows that the PC is communicating with the modem.
Additional Reading Description Author
ZETA Hardware user's manual Siretta
AT command manual Telit
Quick Start Guide Siretta
Realterm https://sourceforge.net/projects/realterm/
PuTTY https://www.puttygen.com/download-putty
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Applicable Products Part number Description 
