GSM Temperature & Power Failure Alarm Controller (4G/3G/GSM) - Remote Relay Switch
How Do You Protect Your Most Valuable Assets When You're Miles Away and There's No Internet?
For owners of farms, remote storage facilities, or server rooms, this is a critical question. A simple power outage or a faulty cooler can lead to thousands of riyals in damages. At Abhir-Online, we understand that a smart solution shouldn't depend on an internet connection. We are dedicated to empowering you with robust, reliable technology that works anywhere.
Introducing the T201 GSM Temperature & Power Alarm Controller. This is not just a product; it's your vigilant guardian for any remote location. Operating over the reliable 4G/3G/GSM cellular network, this powerful unit constantly monitors temperature and mains power status. If the power fails or the temperature goes outside your safe limits, it instantly sends an SMS alert and calls up to 6 pre-authorized phone numbers. More than just an alarm, it's an automation system. You can program it to automatically turn on a backup generator or a cooling system when an alarm is triggered. It also features a remote-controlled relay that can be used to open gates or switch on pumps with a simple, free phone call from an authorized number.
With the T201 from Abhir-Online, you gain peace of mind, knowing your remote assets are protected 24/7, with or without the internet.
💡 How It Works: The Core Technology
This device acts like a dedicated, rugged cellphone for your equipment.
- GSM/Cellular Control: It uses a standard SIM card (Nano type) to connect to the cellular network, just like your phone. This allows it to send and receive commands (SMS) and make calls from anywhere with a cell signal.
- Sensors are its Senses: The included temperature probe constantly measures the environment. The device also monitors its own DC power adapter to know instantly if the mains AC power has been cut.
- Relays are its Hands: A relay is a switch that can be controlled electronically. The T201 has two. Relay0 can be switched on/off with a phone call to open a gate or start a machine. Relay1 can be automatically triggered by an alarm to start a backup system, like a generator or a fan.
📲 The Control & Alert System
All control is done via simple SMS commands. This is a secure and reliable method that does not depend on apps or internet data.
- Instant SMS & Call Alerts: When temperature or power status goes out of your pre-set range, it immediately texts the first 3 authorized users and calls the next 3.
- Free Call Control (Relay0): Up to 200 authorized numbers can call the device to activate Relay0. The device recognizes the number, rejects the call so you aren't charged, and triggers the relay. This is perfect for opening gates for authorized personnel.
- On-Demand Status Reports: Send a simple SMS command (
pwd#EE#) at any time to get a full report of the current temperature, power status, GSM signal strength, and relay states.
🛠️ Setup & Programming Insights from Abhir-Online
- Prerequisites: A Nano SIM card with calling and SMS functionality (PIN code must be disabled).
- Step 1 - SIM & Power: Insert the SIM card, connect the antenna, temperature probe, and the DC power adapter. The internal backup battery ensures it keeps working even if the power fails.
- Step 2 - Set Your Password: For security, the first thing you should do is change the default password (
1234) by sending the SMS command: 1234#PWDnewpassword#PWDnewpassword#. - Step 3 - Authorize Users: Add the phone numbers that need to receive alerts and control the device. For the main administrator, send:
pwd#TEL+CountryCodePhoneNumber#001#. - Step 4 - Set Your Thresholds: Define your safe operating temperatures by sending the command:
pwd#TE-LowTemp#+HighTemp#. For example, for a cooler that must stay between 2°C and 8°C, the command would be: pwd#TE+0020#+0080#.
Pro-Tip:
All commands must be in CAPITAL LETTERS. Before setting user numbers, ensure you include the full country code (e.g., +966 for Saudi Arabia) to ensure SMS and calls work correctly.
Product Features and Advantages:
The G202 GSM Controller revolutionizes remote access with its brilliantly simple and cost-effective design. Its core strength lies in the innovative "free call" control system; by using Caller ID for verification, it allows up to 200 authorized users to operate a gate or barrier without incurring any call charges, making it vastly more economical than systems requiring data or paid services. Security is paramount; the device is engineered to ignore all calls from unknown numbers, ensuring that only users on your approved list can gain access.
Beyond its primary function as a gate opener, the G202 is a versatile remote controller. Its relay can be connected to a wide range of devices, turning your phone into a universal remote for pumps, lights, or industrial machinery. Management is effortless—adding or removing users is done via simple SMS commands, eliminating the logistical nightmare and high cost of distributing and managing hundreds of physical remote controls. Built to operate on the robust and widespread GSM network, the G202 offers unparalleled reliability and control, even in areas far beyond the reach of a Wi-Fi signal.
- Works Anywhere with a Cell Signal 🛰️: Operates on 4G/3G/GSM networks, perfect for remote areas without internet.
- Monitors Critical Conditions: Includes a temperature sensor (-55°C to +125°C) and monitors for mains power failure.
- Instant Multi-User Alerts 🚨: Sends SMS and places calls to up to 6 different users upon any alarm event.
- Dual Relay Control: One relay for free call control (e.g., gates) and another for automated actions based on alarms (e.g., starting a generator).
- 200 Authorized Users: A large list of authorized numbers can call to open a gate or activate a device, making it ideal for community or staff access.
- Built-in Backup Battery 🔋: The rechargeable internal battery can last up to 6 hours, ensuring the device continues to monitor and report during a power outage.
- Secure Operation: Uses Caller ID and a password for identification, ignoring unknown callers and unauthorized SMS commands.
Product Physical Specifications
Model: T201
Communication Protocol: 4G/3G/GSM (850/900/1800/1900MHz)
Rated Voltage: DC 9V~24V/1A
SIM Card Type: Nano SIM, 3V
Temperature Sensor: DS18B20 Probe (Range: -55°C to +125°C, Accuracy: 0.1°C)
Relay Output Voltage: 3A/240V AC
Siren Output: Voltage equals DC input voltage, Current < 1A
Backup Battery: 3.7V/1000mAH (lasts approx. 6 hours)
Dimensions: 96.5 x 72 x 59mm
Net Weight: 188g
Compatibility:
Network: Works with 4G, 3G, and GSM networks in Saudi Arabia and the GCC.
SIM Card: Requires a Nano-sized SIM card with SMS and calling capabilities.
The SIM card's PIN code must be disabled before use.
Gate Openers: Compatible with any gate or garage door opener that has a push-button input for manual operation.
Pumps & Machines: Can control any machine that can be switched on/off by a single button press (via Relay0) or powered directly within the relay's limits.
Applicable Applications and Practical Usage Scenarios:
- For the Modern Homeowner: Imagine arriving home in the rain and opening your gate with a quick, single-ring phone call, without fumbling for a remote. Grant temporary access to a delivery driver or a maintenance worker while you're at work, and then easily revoke their access later with a simple text message. The G202 brings a new level of convenience and secure control to your daily life.
- For the Community or Building Manager: Managing access for a residential compound or an office building with dozens of users is a constant challenge. The G202 eliminates the high cost and hassle of purchasing, distributing, and replacing physical remotes. With the ability to authorize up to 200 users, you can grant and revoke access for residents and employees instantly via SMS, creating a secure and incredibly efficient entry system.
- For the Farm and Isteraha (Rest House) Owner: Your remote property needs a simple, dependable solution. Use the G202 to control the main security gate, activate a water pump for irrigation, or switch on lighting for your facilities, all from your mobile phone. Its reliance on the GSM network means you have guaranteed control even where there is no internet service.
- Cold Storage & Refrigeration: A perfect monitor for commercial coolers and freezers, providing 24/7 alerts for temperature fluctuations and power loss.
Helpful Resources & Videos:
- Cellular Power Outage and Temperature Alarm - How It Works.
- GSM Remote Relay Switch Access Controller GSM Temperature Alarm 2G/3G/4G Power Status Monitoring Power Failure SMS Alarm.
Package Contents:
1 x T201 Control Unit (4G Version)
1 x GSM Antenna
1 x DS18B20 Temperature Sensor Probe (0.5m)
1 x DC Power Adapter
1 x Backup Battery (Internal)
1 x User Manual
Complete Your Setup (Frequently Bought Together)
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Keywords:
GSM Alarm, Temperature Monitor, Power Failure Alert, Remote Relay Switch, T201, SIM Card Controller, SMS Control, Gate Opener, Farm Automation, No Wi-Fi, Abhir online, Remote Monitoring
Frequently Asked Questions (FAQs)
Q1: Do I need an internet or Wi-Fi connection for this to work?
A1: No, you do not. This is the main advantage of the T201. It works entirely over the 2G/3G/4G cellular network using a standard SIM card for all alerts and commands.
Q2: What happens if the main power is cut at my location?
A2: The moment mains power fails, the T201 will instantly send a "Power OFF" SMS alert to the authorized numbers. It will then continue to operate on its internal rechargeable battery for up to 6 hours, monitoring temperature and ready to receive commands. It will send another alert when power is restored.
Q3: Can I use this to open the gate to my farm? Is there a cost for the call?
A3: Yes, this is a perfect use case. You can authorize up to 200 phone numbers. When an authorized number calls the device, it checks the Caller ID, activates the relay to open the gate, and then immediately rejects the call. Because the call is not answered, there is no charge.
Q4: I sent an SMS command but it didn't work. What's the most common mistake?
A4: The two most common issues are: 1) Forgetting to use all CAPITAL LETTERS in the SMS command, and 2) Not including the full international country code (e.g., +966) when setting up user phone numbers. Always check these first.
Q5: What kind of SIM card do I need?
A5: You need an active Nano-sized SIM card. It's very important to first disable the PIN code on the SIM card by inserting it into a regular mobile phone before you place it in the T201 unit.
Q6: How can I check the status of my remote site right now?
A6: Simply send the SMS command yourpassword#EE# to the device's SIM card number. It will reply within a minute with a full status report including the current temperature, power status (On/Off), and GSM signal strength.
How to connect it / Electrical configuration:
- Power: The unit is powered by the included DC 9V-24V adapter. It also has an internal battery for backup during power cuts.
- Relay0 (Call Control): This relay has two terminals (terminals 5 & 6). These are "dry contact" terminals, meaning they act like a simple button press. You connect these terminals to the push-button input on your gate opener or machine.
- Relay1 (Alarm Control): This is a "wet contact" relay (terminals 7 & 8) that outputs 3A/240V AC. It can be used to directly power a siren, a warning light, or a small fan when an alarm is triggered.
- Siren Output: A dedicated output for a 12V DC siren.
- Temperature Probe: Simply plugs into its dedicated port.
