Standard Modem COM Port Settings

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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