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SIMA7670C 4G LTE / GSM Module with RS232 Interface – High-Speed Industrial Wireless Modem with SMA Antenna and GPS Support

Parameter	Detailed Specification
Module Chipset	SIMCom A7670C (4G LTE Cat 1)
Frequency Bands	LTE-TDD/LTE-FDD/GSM/GPRS/EDGE
Data Speed	Uplink up to 5Mbps, Downlink up to 10Mbps
Communication Interface	RS232 (DB9) & TTL Logic Level
Operating Voltage	5V – 12V DC (Industrial Grade)
SIM Card Slot	Standard Nano SIM Card
Protocols	TCP/UDP/HTTP/HTTPS/FTP/MQTT
Antenna Connector	SMA (Female)

Price

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₹ 1,398.31

(Tax included)

Barcode: 378995

Product Description

Step into the era of high-speed IoT with the SIMA7670C 4G LTE GSM Module. This industrial-grade communication board is based on the A7670C chipset, offering reliable Cat 1 LTE connectivity that is significantly faster and more future-proof than older 2G/3G modules. At Robogears, we recommend this version for its integrated RS232 interface, which allows you to connect the module directly to industrial PLCs, older PC COM ports, or standalone data loggers without needing extra converters. Whether you are building a remote solar monitoring station or a vehicle tracking system at your Pimpri facility, this 4G module ensures low-latency data transfer and wide-area coverage across India's modern LTE networks.

Detailed Key Features

4G LTE Cat 1 Technology: Optimized for M2M (Machine to Machine) applications, providing the perfect balance between high speed and low power consumption.
Dual Interface Design: Features a standard DB9 RS232 port for industrial equipment and TTL header pins for direct connection to microcontrollers like Arduino and ESP32.
Global/Regional Compatibility: Specifically tuned for Indian 4G bands (B1/B3/B5/B8/B34/B38/B39/B40/B41), ensuring stable connections on Jio, Airtel, and Vi.
On-board Power Regulation: Includes a high-efficiency voltage regulator that allows the module to be powered by a wide range of DC inputs (typically 5V-12V).
Network Status Indicators: Integrated LEDs provide real-time feedback on Power, Network Registration, and Data Transmission status.

All Technical Details

Pin Definition (TTL Header):
- VCC/GND: Power Input.
- TXD/RXD: Serial Communication (3.3V/5V compatible).
- RST: Hard Reset pin.
- PWR: Power-on trigger pin.
AT Command Set: Supports standard 3GPP and SIMCom enhanced AT commands for easy software integration.
USB Support: Features a Micro-USB port for direct PC interfacing, firmware updates, and NDIS network sharing.
Applications: Smart metering, remote industrial control, 4G hotspots, asset tracking, and security alarm systems.

Prototyping & Engineering Tips (Robogears Exclusive)

Power is Critical: At our Pimpri workshop, we’ve found that 4G modules can draw instantaneous current spikes of up to 2 Amps during network registration. Always use a high-quality 12V 2A DC Adapter; powering this module solely from an Arduino's 5V pin will cause frequent resets and connection failures.
Antenna Placement: For the best signal strength, ensure the SMA Antenna is tightened securely and placed away from large metal objects or high-frequency switching power supplies that could cause interference.
Sim Card Prep: Ensure your Nano SIM is 4G-enabled and the PIN lock is disabled before inserting it into the module.
RS232 vs TTL: Note that you cannot use both the RS232 (DB9) and TTL header pins simultaneously for data. Choose the interface that matches your controller’s logic level.

Package Includes

1 x SIMA7670C 4G LTE GSM Module with RS232
1 x High-Gain 4G LTE SMA Antenna
1 x Connecting Cable (Standard Jumper set)

Image Disclaimer

Product images are shown for illustrative purposes only. The color of the PCB (typically Blue or Green) or the specific manufacturer of the passive components may vary between batches, but the A7670C 4G LTE and RS232 performance remains as described.

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