# GSM relay module, gate opener, G203, 9–24V, 2G

- Page: https://sigmanortec.ro/en/gsm-relay-module-gate-opener-g202-plus-9-24v-2g
- Price: 238.75 RON
- Availability: In stock; 1-2 zile
- Reference: 9535 · EAN: 5946024080961
- Category: Mechatronics and IoT > Sensors and Modules > GSM
- Specifications: Supply Voltage: 9; Maximum Input Voltage: 24; Output Type Voltage: Closed-Open Contact; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.
- Package (shipping data): 0.095 kg
- Updated: 2026-09-14
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 05:21 (Europe/Bucharest)

## Description

GSM relay module for gate opening and access control, fast activation by rejected call or SMS, works on 2G network and is powered at 9-24V. It allows storing up to 1001 authorized numbers and defining administrators and users, includes an external antenna and Nano SIM slot, COM NC NO relay output with configurable pulse time.
GSM remote-control relay module that can be used to open gates, doors, or to remotely control any kind of device or equipment.
The module is the 2G version, which supports only 2G networks and does not support 4G. A 4G model is also available in the catalog.
The relay is activated either by directly calling the SIM card installed in the module or by SMS message. Call activation is convenient because the module will not answer the call; it will reject it after the first ring, thus avoiding call charges. After receiving the call, the module will send a text message to the caller informing them of the relay status.
All settings are made via SMS commands (the package includes the command list), and security is ensured by the ability to store up to 1001 users in the module memory. The module will respond only to commands received from registered numbers.
SMS can also be used to set how long the relay should remain activated. The factory default is 0.5 seconds, but it can be changed via SMS command (the time communicated by SMS represents a unit of 0.5 s, so to keep it active for 10 seconds, for example, you must send the command for double. If you want the relay to remain permanently active until the next call, set the time to 0.
The module comes with a detachable external antenna and a Nano SIM card slot. The output relay has COM, NC, and NO terminals. A physical button can also be attached to the module to activate the relay.
It can be mounted directly on a DIN rail.
The G203 model allows defining two access levels: administrators and normal users. Administrators can change the module settings and manage the user list, while normal users can activate the relay without access to configuration.
Connection:
Specifications:
Model: G203
Power supply voltage: 9 - 36VDC, recommended 9 - 24VDC
Power supply current: 2A recommended
Antenna: SMA
Frequency: Quad band 850/900/1800/1900 MHz
Network: 2G
Operating temperature: -20 - +60 °C
Humidity: 90%, non-condensing
Dimensions mm: 96.5 x 50 x 31.5mm
The model is G203, the updated version of the G202 Plus model.
Instructions:
Download the manual from the Download section.