Applicable Products Part number Description
ZETA-NLP-LTE1 (EU) Ultra Low Power European LTE Cat 1 Modem
ZETA-NLP-LTEM (GL) Ultra Low Power Global LTE Cat M Modem
Objective Power consumption is one of the key requirements of any Wireless IoT application.
A significant contributor to power consumption in such systems is the Cellular modem.
This application note shows how to set Siretta ZETA NLP modem in ultra-low power mode for reduced energy consumption.
Solution ZETA-NLP Ultra Low Power Mode The ZETA-NLP has a special mode of operation which forces the unit to drop down to an ultra-low power state where the modem is still operational and registered on the network but is functionally asleep. This allows for the modem to remain connected to the network and be ready to send and receive data using a fraction of the energy.
This ultra-low power state is achieved by setting the following AT command to the modem:
COM3 - Tera Term VT
File Edit Setup Control Window Help
AT CFUN=5
OK
Ultra Low Power Control Signal To control the power state of the modem from low power to ultra-low power it is necessary to use a special control signal in the RS232 serial port.
The control signal is called Data Terminal Ready (DTR) and is available on the RS232 serial port on pin 4 as shown in the table below.
Once the CFUN=5 command has been issued then the modem is ready to enter ultra-low power mode. To activate low power mode and put the modem in to a dormant state the DTR line must be de-asserted on the serial port. When the device has entered ultra-low power mode the CTS line will be de-asserted indicating that the device has gone into ultra-low power state. At this point the serial port is also deactivated, and the modem will not respond to AT commands and will appear to be OFF.
To bring the modem back to normal power state and communicate with the modem again it is necessary to assert the DTR line and the modem will leave its dormant state and become fully active again for normal operation. When in the dormant ultra-low power state an incoming call request or incoming SMS will force the modem to enter its full power mode and the modem is able to be used as normal.
Pin Name Usage Status Direction
1 DCD Output from UART that indicates the carrier is present Connected OUT
2 RXD Output transmit line of UART Connected OUT
3 TXD Input receive line of UART Connected IN
4 DTR Input to UART and controls DTE ready condition Connected IN
5 GND Ground Connected IN
6 DSR Output from UART that indicates the module is ready Connected OUT
7 RTS Request to Send - Input line of UART that controls hardware flow control Connected IN
8 CTS Clear to Send - Output line of UART that controls hardware flow control Connected OUT
9 RI Ring Indicator - Output line of UART that indicates the incoming call condition Connected OUT
This mode allows the modem to consume little current whilst it is not in use but be available for use locally by asserting the DTR line. The modem power ON and power lines will remain active throughout and can also be used to turn the modem completely OFF.
DTR Control Software To control the DTR line on the modem and communicate with the AT command interface on the RS232 serial port it is necessary to use Terminal software which controls the DTR line. Siretta has tested the ZETA modem family with several terminal emulator applications which support DTR and RTS control signalling. Two recommended applications are shown below:
Realterm (Download Link)
Telit AT Controller
Ultra Low Power Receiving Data In the ultra-low power state, a special provision must be catered for when data is received from a connected socket to be output over the serial port.
In this mode it is necessary to run the serial port in the following state:
Enable hardware flow control with AT&K3
Enable low power mode by issuing AT CFUN=5
Setup a socket connection and establish an active connection
Enter ultra-low power state by de-asserting DTR control line
De-assert RTS line
Wait for specified timeout to check for incoming data
When the timeout has expired, to check for data over the connected socket follow the procedure below:
Assert DTR line to disable low power state and activate full serial port
Assert RTS line to receive full buffered data over serial port and wait for all data to be received
When all data has been received de-assert RTS line
De-assert DTR line to re-enter low power state and wait for the specified timeout to receive further data.
NOTE - While there is no data pending reception from the cellular network, the modem does meet the published low power consumption figures. However, if there is data pending from the cellular network, then the modem power consumption rises to approximately 5mA at 12V until the data transfer process has completed and low power state is re-entered. The modem does not automatically enter the full power state when there is pending cellular network data, so the connected application is required to periodically poll the cellular network. If there is pending data from the cellular network, this will immediately start to be received over the serial connection.
Once the data transfer is complete, the modem can be put back into the low power state where it will meet the published power consumption figures. The shorter the check interval, the less time will be potentially spent at the higher 5mA current consumption. The longer the check interval the less power will be used checking for received data from the network. Choose this check interval to match the requirements of your system.
Demonstration of Solution Testing Ultra Low Power Mode using an Outgoing Socket Connection COM3 - Tera Term VT
File Edit Setup Control Window Help
//Set extended error
Europe Stories
11/12/2025
Dalet, a leading provider of cloud-native, end-to-end media workflow solutions, ...
28/11/2025
It's easy to ignore those little red update available badges. But when it ...
28/11/2025
Friday 28 November 2025
Sky Sports x Slawn drop limited-edition football jersey...
28/11/2025
Rohde & Schwarz shows resilience in a challenging environment, revenue exceeds t...
28/11/2025
Unwrapped: The Toy Show Appeal - airing this Sunday on RT One and RT Player- s...
27/11/2025
27 Nov 2025
GSMA brings M360 Eurasia 2026 to Samarkand in partnership with VEON...
27/11/2025
Tahar Rahim and Izuka Hoyle star in the gripping six-part Sky Original from Acad...
27/11/2025
Thursday 27 November 2025
Sky Arts Reveals the Nation's Greatest Basslines - and Queen Reign Supreme
The UK's most iconic basslines have been revealed...
27/11/2025
Rating reflects rating progress across areas including policies, diversity & inclusion, health & safety and Net Zero leadership
Winchester, UK, 27 November 202...
27/11/2025
What are the industry standards for Retail Media? Kathryn explains that certification is based on the IAB Europe Retail Media Measurement Standards and the IAB ...
27/11/2025
World champion boxer and Irish sporting icon Katie Taylor will be in studio this...
27/11/2025
Roblox, one of the world's most popular online gaming platforms for primary ...
26/11/2025
Book podcasts are booming. On Spotify, you'll find everything from celebrity book clubs to deep dives with bestselling authors. And in markets where audiobo...
26/11/2025
YouView Achieves Greenly Gold Certification for SustainabilityNov 26, 2025
YouView is proud to announce a Gold Certification award from Greenly for our perform...
25/11/2025
Tracy Bonareri Onchoke, an investigative journalist from Kenya is the winner of the Thomson Foundation's Young Journalist Award 2025.
The 26-year-old-sele...
25/11/2025
The best playlists, podcasts, and audiobooks bring a little extra magic to your daily routine. With new features and offerings, Spotify Premium delivers even mo...
25/11/2025
Comprehensive new research confirms what we already knew: Australian music fans love the quality, quantity, and access they have to new and local music on strea...
25/11/2025
Applicable Products
Objectives The purpose of this application note is to give a brief background on 5G (NR) wireless communication an explain the reason a SN...
25/11/2025
25. November 2025 Cecilia Pierron
Last week, we took part in OnDAM 2025, an educational conference fully dedicated to DAM, hosted by Activo Consulting. The ...
25/11/2025
25 Nov 2025
VEON's QazCode and MeetKai Sign Agreement to Power National LLM...
25/11/2025
UKTV has acquired a high-profile slate of US dramas from Paramount Global Conten...
25/11/2025
A symphony of genius, rivalry and vengeance, boldly reimagined from Peter Shaffe...
25/11/2025
Article courtesy of Cinematography World
Read the article
FilmLight has finalised the prestigious 2025 FilmLight Colour Awards jury and welcomed award-winning...
25/11/2025
Article courtesy of Prensario
Read the article
La serie fue dirigida por Juli n de Tavira, Rodrigo Santos, y David Leche Ruiz, con direcci n de fotograf a a...
25/11/2025
Article courtesy of The Hollywood Reporter
Read the article
The awards, celebr...
25/11/2025
Article courtesy of Televisual
Read the article
Already live in Los Angeles and rolling out in New York and London, Nara gives producers, colourists, conform ...
25/11/2025
Article courtesy of Digital Media World
Read the article
ARTONE post-house in Tokyo is the first facility in Japan to integrate Baselight M, choosing its prec...
25/11/2025
Article courtesy of The Hollywood Reporter
Read the article
Once hidden in post-production suites, the artists who make movies and TV shows look the way they ...
25/11/2025
Article courtesy of Deadline
Read the article
The Brutalist' & Bad Bunny's Nuevayol' Music Video Among 2025 FilmLight Colour Award Winners - Cam...
24/11/2025
Robyn made her long-awaited return to the stage this week, as Spotify and Acne Studios brought friends and top fans together for an unforgettable evening at the...
24/11/2025
After more than two years of redevelopment, FC Barcelona returned to its spiritual home on November 22, hosting Athletic Club in the first La Liga match at the ...
24/11/2025
24 Nov 2025
Kyivstar Launches Starlink Direct to Cell Satellite Connectivity in Ukraine Today's Launch Makes Ukraine the First Country in Europe Where Star...
24/11/2025
Ahead of the new ninth series of Dancing with the Stars, kicking off in January 2026, RT and Shinawil have announced the arrival of three new faces to the hit ...
21/11/2025
Fans have been counting down the days until the final theatrical chapter of Wicked is revealed. To celebrate the highly anticipated release of Wicked: For Good ...
21/11/2025
Last week, Spotify turned up the volume in Seoul with the return of Spotify Hous...
21/11/2025
Wiesbaden, November 21, 2025. The SGL Carbon site in Meitingen has reason to celebrate as one of its trainees received a special award. Elias Stemmer was honore...
21/11/2025
Sky Media's £2m award-winning sustainability initiative crowns its first charity as this year's standout changemakerFriday 21 November 2025
GoodGym nam...
21/11/2025
As COP30 draws to a close, the International Electrotechnical Commission (IEC), ...
20/11/2025
Your playlists are personal. They're the soundtracks to your road trips, your quiet mornings, and your biggest celebrations; collections of memories and dis...
20/11/2025
Spotify, uzun s redir zerine al t T rk m zik k lt r n n ikon haline gelmi ...
20/11/2025
For the first time, Spotify has teamed up with The Hollywood Reporter to cohost ...
20/11/2025
This year's ARIA Awards marked a turning point for Australian music, and Spotify was right at the heart of it. For the first time in the awards' nearly ...
20/11/2025
15 March 2012
SHARE Facebook Twitter Linkedin Email
Cinegy and Vericom are pleased to announce the recent deployment of Cinegy Archive for production and as...
20/11/2025
6 September 2012
SHARE Facebook Twitter Linkedin Email
FIC Turkey supplies media content to Pay TV under Fox TV Channel brands in Turkey.
At the start of s...
20/11/2025
25 June 2014
SHARE Facebook Twitter Linkedin Email
Last month VIVA finalized its Cinegy installation in order to produce and broadcast the World Cup Brazil ...
20/11/2025
1 October 2014
SHARE Facebook Twitter Linkedin Email
With 5 locations spread out around Baden-W rttemberg, Schw bisch Media required a scalable end to end s...
20/11/2025
27 April 2015
SHARE Facebook Twitter Linkedin Email
Cinegy, which develops and produces media asset management products that are used in flagship production...
20/11/2025
12 August 2015
SHARE Facebook Twitter Linkedin Email
Munich, Germany, 26 October 2015 - Cinegy, which develops and produces software technology for digital ...
20/11/2025
5 November 2015
SHARE Facebook Twitter Linkedin Email
Munich, Germany 3 November 2015 - Cinegy, which develops and produces software technology for digital ...
Applicable Products Part number Description 
