Device Manual of Discovery 2G Plus

Discovery 2G RS232 is a tracking terminal with GNSS and GSM connectivity, capable of collecting device coordinates and transmitting them via the GSM network to a server. It is ideal for applications requiring remote object tracking.

Package Contents

• Discovery 2G RS232 device
• Input/output power cable with 2x6 connection pins
• 3.7V 350 mAh rechargeable Li-PO battery

Basic Characteristics

GSM / GPRS / GNSS Features

• Name: Quectel MC20
• Technology: 2G (GSM/GPRS), GNSS
• SMS (text) support
• Integrated GNSS receiver
• Sensitivity: up to -149 dBm

Cellular

• Frequency Bands: Quad-band GSM850, EGSM900, DCS1800, PCS1900

Transmit Power

• Class 4 (2W) at GSM850 and EGSM900
• Class 1 (1W) at DCS1800 and PCS1900

Hardware Features

• Built-in movement sensor
• Internal High Gain GNSS and GSM antennas
• Internal flash memory 4MB (32,768 records)
• 350 mAh Li-Po rechargeable 3.7V battery

Interface Features

• Power Supply: +9V to +90V DC
• Digital Inputs: 2 (DIN1, DIN2)
• Analog Inputs: 2 (multiplexed with digital inputs)
• Digital Outputs: 2 (DO1, DO2) for external relays, LEDs, buzzers
• 1-Wire Interface: Supports temperature sensors
• Status Indicators: 4 LEDs (GNSS, Network, Power, User)

Special Features

• Fast GNSS fix (outdoor)
• Reliable tracking in urban environments
• Compact and rugged design
• Real-time tracking
• Smart data acquisition based on:
  • Time, Speed, Distance, Ignition or I/O events
• Data transmission via GPRS
• Configurable via secured SMS
• 1x Micro SIM \ eSIM
• Overvoltage protection: YES

Electrical Specifications

Description	Voltage	Duration
Normal operation	+9 to +90 V	Unlimited
Protection activates, device off	90 V	Unlimited
Maximum voltage	< 90 V	Unlimited

Technical Details

• Battery charge current: Avg. 140 mA
• Operating temp (without battery): -40°C to +85°C
• Storage temp (without battery): -40°C to +80°C
• Operating temp (with battery): -20°C to +70°C
• Storage temp (with battery): -20°C to +40°C
• Humidity: 5% to 95% non-condensing
• Ingress Protection: IP54
• Weight (device + battery): 60 g
• Resettable fuse: 3A, 100V

Mechanical

• Dimensions: 85mm x 66mm x 20mm (L × W × H)
• Enclosure: Polycarbonate

LED Indications

Function	Indicator
GNSS	LED (Orange)
Network	LED (Green)
Power	LED (Red)
User Status	LED (Red)

Internal Battery Specifications

Property	Value
Type	Li-Po rechargeable battery
Voltage	3.75 – 4.2 V
Capacity	350 mAh
Power	0.64 – 0.66 Wh
Charge Temp	0°C to +45°C
Discharge Temp	-20°C to +60°C
Storage Temp	-20°C to +45°C (15 days); -20°C to +35°C (90 days)

⚠️ CAUTION: RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE. DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS.

Do not discard batteries in household waste. Use recycling bins or drop-off centers.

Electrical Characteristics

Parameter	Min.	Typ.	Max.	Unit
Supply Voltage	+9	–	+90	V
Digital Output Voltage (DO1, DO2)	10	–	60	V
Drain Current (DO1, DO2 OFF)	–	–	120	mA
Input Resistance (DIN2)	–	2.2K	–	Ω
Input Voltage Threshold (DIN1–2)	90	–	–	V
Analog Inputs
Voltage Range	0	–	+90	V
Resistance	–	2.2K	–	Ω
Measurement Error	–	–	2	%
1-Wire Interface
Output Voltage	–	4.5	–	V

Other Features

• Remote reset via SMS/GPRS
• Supports 2 IPs simultaneously
• Firmware Over-The-Air (FOTA)
• Geo-fence (Circular/polygonal)
• Protocols: TCP/IP, HTTP, SMS
• Memory: up to 32,768 positional logs
• SMS fallback if GPRS unavailable
• Backup battery runtime: 1 hour
• SIM support: 1x Micro SIM / eSIM
• Alerts: battery disconnection/reconnection, over-speed, ignition, geo-fence, tilt, low battery
• External battery voltage monitoring
• Optional interfaces: 1-Wire, RS232, Immobilizer/Buzzer

Absolute Maximum Ratings

Parameter	Min.	Typ.	Max.	Unit
Supply Voltage	+9	–	+90	V
Drain-Source Clamp Threshold	–	–	+60	V
Digital Input Voltage	–	–	+90	V
Analog Input Voltage	0	–	+90	V

⚠️ Note: Analog input error margin may increase with temperature variation.