Willfar Information Technology Co. Ltd.
Stock Code: 688100.SH The Pioneer in Smart Utility Service and IoT Solutions
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External 3G Communication Module for Smart Meter Celluar Data Collection System
Company Profile
Willfar Information Technology Co., Ltd.
- Established in 2004;
- Listed on the STAR Market of the Shanghai Stock Exchange in December 2019;
- Leading supplier of meter reading (AMI) equipment and operation service;
- The first company to develop "One DCU Reading Multi-meter" solution in China;
- The first company to have large-scale application of technologies and systems like "CPU smart-card Charge and Control", "One DCU Reading Multi-meter", LoRa-based RF Communication and "District Metering Area (DMA)”
Introduction
- The external 3G Cellular module is GSM-based wireless packet switched technology used to provide end-to-end wide area wireless IP connections, which can transfers data to users in “Packet” mode at a high-speed. The Cellular module has prominent advantages in many aspects such as the transfer rate, wireless resource management and billing.
Technical Parameters
3G Module
| Item | Parameter |
| Nominal Voltage | 12V DC |
| Voltage Range | 5V DC~32V DC |
| Idle Current | 13mA@5V |
| Communication Current | 210mA@5V |
| Maximum Current | 800mA |
| Sensitivity | <-108.5dBm |
| SIM Interface | 1.8V/3V |
| Electrostatic Discharge IEC61000-4-2 | Air discharge, 15kV, 10 cycles |
| Operating Temperature | -25 °C ~ + 75 °C |
| Relative Humidity | ≤95%, non-condensing |
RS232 Interface
Various interfaces in 3G Module to connect Meter and Antenna
RS-232(male) port pin assignment
| PIN | |
| 1 | V232 |
| 2 | TXD (out) |
| 3 | RxD (in) |
| 4 | NC |
| 5 | GND |
| 6 | NC |
| 7 | NC |
| 8 | NC |
| Pin No. | Signal Name | Pin Type | Description |
| 1 | NC | No connection | |
| 2 | |||
| 3 | |||
| 4 | METER RXD | Signal (meter input) RS232 TXD | Data from MCU to Meter |
| 5 | METER RXD | Signal (meter input) RS232 TXD | Data from Meter to MCU |
| 6 | NC | No connection | |
| 7 | GND | GND Power | DC Ground |
| 8 | NC | No connection | |
| 9 | NC | No connection | |
| 10 | NC | No connection |
Certificate
CE
Features
1. GSM/GPRS (850/900/1800/1900 MHz)/WCDMA(2100MHz)
2. Over the Air Update
3. Supports TCP/UDP/FTP/DNS protocol
4. Remote SMS configuration
5. Control Via AT Commands
6. Supports USB2.0 slave mode
7. Update Via USB Port
8. Data transfer
• HSPA+
- Max. 14.4Mbps(DL), Max.5.76Mbps(UL)
• WCDMA
- Max.384Kbps(DL), Max.384Kbps(UL)
• EDGE Class:
- Max. 236.8Kbps(DL),Max. 236.8Kbps(UL)
• GPRS
- Max. 85.6Kbps(DL), Max. 85.6Kbps(UL)
Reading Instruction
1. Date cable socket to connect meter
2. Power supply socket
3. Antenna pedestal with SMA type
4. Network LED with red always blink
5. SIM card pedestal for installing SIM card
Function
An External 3G Module is composed of several elements, including:
1. CPU is a dual frequency for GSM/GPRS and UMTS chip
2. Watch Dog chip to control power supply
3. Antenna pedestal with SMA type
4. SIM card pedestal for installing SIM card
5. LED display to indicate network status
6. DC/DC power supply to adjust voltage for GPRS CPU
Situation
For smart meter required communication function. Pluggable.
Dimension