868MHZ Wireless M-bus Module FC-703C USB dongle with 10dbm output power
1. Technical Specification
| Item | Min | Typ. | Max | Unit |
| Frequency bands | 868 | 870 | MHz | |
| Number of channels | 12 | |||
| Supply voltage VCC | 2.2 | 3.3 | 3.6 | VDC |
| Voltage on any pin | VCC-0.7 | VCC | VDC | |
| TX Current (RF_POWER=5/10dbm) | 40 | mA | ||
| RX Current | 24 | mA | ||
| Sleep Current | 0.6 | uA | ||
| Input/output impedance | 50 | Ohm | ||
| RF Data rate | 4.8 32.768 100 | kchip/s | ||
| Max RF output power(VCC=3.3V) | 10 | dBm | ||
| Sensitivity, 32.768K | -102 | dBm | ||
| Spurious emission, TX < 1 GHz > 1 GHz | -36 -30 | dBm | ||
| Sensitivity(32.768K) | -102 | dBm | ||
| Blocking 1 MHz 4 MHz 8 MHz | –52 –56 –63 | dBm | ||
| Image Rejection | –30 | dBm | ||
| Spurious Emissions | -54 | dBm | ||
| Harmonics | –42 | dBm | ||
| Minimum RST Low Time to Generate a System Reset | 15 | μs | ||
| Operating temperature | -40 | 80 | °C | |
| Storage temperature | -50 | 150 | °C | |
| Weight | 5 | g |
2. Brief Description
FC-703C RF transceiver module follows the wireless M-BUS protocol. It has a UART interface for serial communication and configuration. The dimension is 13.7*25.4*3.4mm.FC-703C can work in S, T, R2 and C mode. It works in sleeping mode with super-low consumption power and be wakened up via serial port. By mounting the module onto the user board, it is easy to use through serial port communication protocol. 868MHZ Wireless M-bus Module FC-703C with 10dbm output power is a good choice for smart metering application.
3.Main Applications
AMR/AMI
Electricity meters
Gas and Water meters
Heat meters, Heat cost allocators
Handheld device and gateways
In-Home Display and wireless sensor
4.Pin Assignment and Description
| Pin | Name | Describe |
| 1 | GND | Ground |
| 2-7 | RESERVED | For test and future extension, not connected |
| 8 | RTS | Receive flow control I, output, high: idle, low: busy. |
| 9 | CTS | Send flow control O, input high: idle , low: busy |
| 10 | RESERVED | For test and future extension, not connected |
| 11 | CONFIG | Reserved |
| 12 | GND | Ground |
| 13 | GND | Ground |
| 14 | VCC | POWER SUPPLY |
| 15 | GND | Ground |
| 16 | GND | Ground |
| 17 | RF | RF pin, connect with antenna |
| 18 | GND | Ground |
| 19 | GND | Ground |
| 20-24 | RESERVED | For test and future extension, not connected |
| 25 | LED1 | LED1 output. If not needed, not connected. Active high. |
| 26 | LED2 | LED2 output. If not needed, not connected. Active high. |
| 27 | RXD | Serial RX |
| 28 | TXD | Serial TX |
| 29 | RESET | Reset Pin (active in low) |
| 30 | GND | Ground |
5.Typical Application Description
