433 tranciver

ShenZhen YiShi Electronic Technology Development Co., Ltd YSC20UB MANUAL

Yishi RF Link Solution http://www.yishi.net.cn/RF 1/5

YSC20UB RF Data Transceiver

YSC20 series Low power RF modules design for professional UART data transmission, embedded ISM wireless solution in short range. YSC20 adapts Texas Instruments (Chipcon) CC1020 RF IC and Philips MCU , works on ISM frequency band, half duplex integrated receiving and transmitting. Modules could directly connect with monolithic processors, PC, RS485 devices, and other UART components with RS232, RS485 and UART/TTL level interface port. Transparent data interface, nakedness, and wide temperature design handles most industrial application though indoor/outdoor environments.

1. Specifications * RF power: ≤50mW/ 17dBm; * Receiving current: <25mA; * Transmitting current: ≤55mA; * Sleep current: <20uA; * Power supply: DC 5v or 3.3V; *Receiving sensitivity: 115 dBm (@9600bps); 120 dBm (@1200bps); * Size: 47mm×26mm×10mm (without antenna port ). * Range: ≤0.8Km (BER=10 3 @9600bps，when antenna is 2m above ground in open area),

≤1Km (BER=10 3 @1200bps，when antenna is 2m above ground in open area).

2. Products Main Features * Carrier frequency: 433/450/868/915MHz or ISM others optional; * Interface: RS232/ RS485/ TTL optional; * Multichannels: 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 nonstandard user protocols; * Interface format: 8N1/8E1/801 userdefined, or customization for other format interface; * Modulation: GFSK. Based on the Gaussian Frequency Shift Keying (GFSK) modulation, High

antiinterference 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 ~+75 (31~167 F); * Working humidity: 10%~90% relative humidity without condensation;



3. Application areas * Automatic meter reading(AMR), * Wireless smart terminal: POS, PDA, * Wireless electronic display screen, LED display, PTZ; * RS485 wire multidrop system changeover wireless system; * Wireless remote control, Environment monitor, telemetry system; * Check attendance system, Queuemanagement 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 TxD 4 TXD/TTL Serial data transmitting end TTL RxD 5 DGND Digital grounding 6 A(TXD) A of RS485 or TXD of RS232 A(RxD) 7 B(RXD) B of RS485 or RXD of RS232 B(TxD) 8 Sleep Sleep control (input) TTL Sleep signal Low level sleep 9 Test Exfactory testing null

NOTE: Generally the module is in receiving status, when power on the module, red LED flash 500mS, Red LED flash indicates transmitting, Green LED flash indicates receiving. .



The connection schematic diagram of transceivers with terminals.

6.Timing Diagram 1. Transmission Delay When module A send data to module B by wireless, there is a delay for 15bytes, the time is related with air baud rate.

Air baud rate & transmission delay:

Air baud rate（Bps） Delay（ms）

19200 8

9600 15

4800 30

2400 60

1200 120 2. Module will switch tx & rx automatically, delay time of conversion between transmitting and receiving is 100uS.

7. Sleep function Sleep status only takes 10UB current. If the Sleep pin (No.5) continuously connects low level (>200millisecond), the module will be in sleep status, modules can not receive or transmit any data when sleep. Only when the Sleep pin set in the state of high level (VH<3.5V) or hangs/empty, module can be in receiving status again. The delay time for conversion between sleeping and receiving is less than 150mS.



Sleep timing diagram

8. Frequency Channel 1) Corresponding frequency points at 433MHz of 1~8 channels

Ch. Frequency Ch. Frequency Ch. Frequency Ch. Frequency

1 429.0325MHZ 2 430.0325MHZ 3 431.0325MHZ 4 432.0325MHZ

5 433.0325MHZ 6 434.0325MHZ 7 435.0325MHZ 8 436.0325MHZ

2) Corresponding frequency points at 868MHz of 1~8 channels Ch. Frequency Ch. Frequency Ch. Frequency Ch. Frequency

1 867.0325MHZ 2 868.0325MHZ 3 869.0325MHZ 4 870.0325MHZ

5 871.0325MHZ 6 872.0325MHZ 7 873.0325MHZ 8 874.0325MHZ

3) Corresponding frequency points at 915MHz of 1~8 channels Ch. Frequency Ch. Frequency Ch. Frequency Ch. Frequency

1 915.0325MHz 2 916.0325MHZ 3 917.0325MHZ 4 918.0325MHZ

5 919.0325MHZ 6 920.0325MHZ 7 921.0325MHZ 8 922.0325MHZ

Channel 6 is default value for 433MHz modules; Channel 2 is for 868MHz modules, channel1 for 915MHz. User can change or view the module’s parameter setting (interface baud rate and channel) by Command or testing software “YSPRG.EXE” in the CD (Free).

9. Command set of parameter setting User can configure Yishi RF module by our windows software or by command set by programming. Command format:

Command Type Frame

header

Frame

Length

Command

work

Check

sum

Remarks

Change Channel

No

55AA 03 07XX XX=01-08, channel number

Read Channel 55AA 03 2400 Ruturn:24 XX（01-08）

Set Interface

Data Rate

55AA 03 28XY Y indicates parity: Y=3 Even parity, Y=0 no Parity;Y=2 Odd parity; X indicates port baud rate, X=0 19200; X=1 9600;X=2 4800;X=3 2400;X=4 1200;

Device Detect 55AA 03 2700 Ruturn:27 0A 20 MODULE=C20U，

VER=2.0



10. Data package When the interface baud rate is less than or equal to the air effective baud rate, YS RF modules could send unlimited length packets theoretically. We does not recommend sending one long data packets, the proposed length of each packet data between the 60 ~ 100B, better not more than 120B. We also suggest use program ARQ for error retransmission data packets. When the serial rate is greater than the air rate, module could transmit 150bytes, the redundant data will saved in module's RAM temporarily.

11. Antenna configuration Match with 50Ω, 1/4wave antenna, A0# is standard and free, other type antenna needs extra charge.

Standard package: one module+ A0# Helical SMA antenna+ L0# 9pin line

Notes: Modules can share DC power supply with other equipment, Ensure the supply is stable (ideally <10mVpk ripple). Keep the module away from other EMF generating components. High mount antenna as close to the module as possible. Set antenna more than 2meters above ground in open area to reach optimal range.

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433 tranciver