YS-C20S Cheap RF module /small size

Product Name; YS-C20S 
Specifications: 10mW output, 433/868/915Mhz, small size
Brief Introduction:Small size, spring antenna
 
    Product Description

1. Specifications
  * RF power: ≤10mW/ 10dBm;
  * Receiving current: <30mA;
  * Transmitting current: ≤50mA;
  * Sleep current: <30uA;
  * Power supply: DC 5V;
  * Carrier frequency: 433/450/868/915MHz optional;
  * Interface: TTL/UART only;
  * Receiving sensitivity: -110 dBm (@9600bps); -118 dBm (@1200bps);
* Size: 28mm×15mm×10mm (without data pin & antenna port, spring antenna).
* Weight: 25g
  * Range: ≤0.4Km (BER=10-3@9600bps,when antenna is 2m above ground in open area),
          ≤0.6Km (BER=10-3@1200bps,when antenna is 2m above ground in open area).
 
2. Products Main Features
  * Multi-channels: 8 channels, expandable for 16/32 channels;
  * Baud rate in air: 1200/2400/4800/9600/19200bps, set before delivery;
  * Transparent data transmission: What has been received is exactly what has been transmitted, suitable for any standard or non-standard user protocols;
  * Interface format: 8N1/8E1/801 user-defined, or customization for other format interface;
  * Modulation: GFSK. Based on the Gaussian Frequency Shift Keying (GFSK) modulation, High anti-interference and Low BER (Bit error Rate);
  * Half duplex: Integration of receiver and transmitter,10ms auto change for receiving and sending;
  * Low power consumption and sleep function;
  * Widen Temperature: -35°C~+75°C (TCXO , -31~167 F) ;
  * Frequency Stability: ±2.5ppm Industrial
  * Working humidity: 10%~90% relative humidity without condensation;
3. Application areas
  * Automatic meter reading(AMR),
  * Wireless smart terminal: POS, PDA,
* Wireless alarm and security systems , PTZ,
* Wireless electronic display screen, LED display,
* RS-485 wire multi-drop system changeover wireless system;
  * Wireless remote control, Environment monitors, telemetry system;
  * Check attendance system, Queue-management system and positioning in coal mine;
  * Industrial automatic data collection, Wireless Data Acquisition, Wireless sensor, SCADA.
4. Installation dimension
5. Interface pin out definition
Pin No. Pin name Description Level Connection with terminal Remands
1 GND Grounding of power supply   Ground  
2 Vcc Power supply DC +3.3~5.5V    
3 RXD/TTL Serial data receiving end TTL    
4 TXD/TTL Serial data transmitting end TTL  
5 Sleep Sleep control (input) TTL  Sleep signal Low level sleep
6 Test Ex-factory testing   null  

Communcation Match with YS-C20 & YS-C30 series radios.