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RD-485 RS485 Radio Modem

RD-485 is a half-duplex wireless data transmission product. It only needs interface applications which can support Main-machine and internal RS485 or RS232 communication, and then it can be through the serial interface standard for wireless data transmission.

APPEARANCE

External Appearance

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FEATURES

Application

When computer is through RS232 interface to link to RD-485, it will be able to process the remote data transmission function, and also to be small network.


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Computer and Industry Control Box link to RD-485 through the interface of RS232 and RS485, it's able to process the functions of long-distance control and data surveillance. 

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The computer and industry control box link to RD-485 through the interface of RS232/485, it would be able to process the functions of long distance control and data surveillance. 

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The computer and industry control cabinet link to RD-485 through the interface of RS232/485, it's able to control the industry equipment in long distance. 

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Door Control System link to RD-485 through the interface of RS232/485, and also use our company's Remote controller (TX-800), it's able to auto-set and react the distance. When remote controller reach the set distance, the door control system is going to distinguish by RD-485.

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RD-485 sets a complete circuit and RF transceiver interface, Figure 1 is for the RD-485 features diagram. The main components include: MCU processor, RF circuits, memory, power and system connector. It can be an external antenna. Besides, the system connector can connect an external power supply, serial interface, RS485 interface.

In Figure 1, red box for the RD-485 within the various components of the motherboard, but the red line is for the external interface. RD-485 motherboard completed a wireless data WENSHING Electronics Co., Ltd. RD-485 Instruction Manual Page 5/18 V1.3 transmission of all the features, including RF norms and RF data encryption, such as radio frequency calibration instructions. There is also: RS232 interface and RS485 interface, LED indicator light. And followings will be briefed on the motherboard and external interfaces, and other parts of the function.

  • A. MCU processor :
    MCU processor is to complete all the RD-485 signal processing functions, including information on the RF transceiver, LED light's instructions, the key judgment, RS232/RS485 data processing.

  • B. RF Circuit:
    Radio frequency circuit is to provide a 868 ~ 928 MHz transceiver channels, including the reception circuit, firing circuit, Synthesis circuit.

  • C. Memory :
    Main memory used is to store the current operating frequency and RF transmission rate.

  • D. Circuit of the power :
    It can be AC or DC input.

  • For half-duplex wireless RF transceiver product

  • RS232 or RS485 communication, standard serial interface for wireless data transmission

  • 1 on 1 and 1 on the multi-mode transmission

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Figure 1 RD-485 function block diagram

System linking Chart

Indication PositionItemDescription
1AC/DC INPUTOuter Power Input
2RS232RS232 (TTL)
3RS485RS485 (CMOS)
4AntennaAntenna input position
5Settings ButtonWithin the parameters of Laws
6TrackPut into the alum. Track position.


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SPECIFICATION

Technical specifications 

  • Frequency : 868~928MHz

  • Distance : 150M (Straight-line distance under open space)

  • Number of Channels : 4800

  • Consumption Current : 55mA

ItemSpecificationRemark
Voltage RangeAC:9~30V ; DC:8V~28V
Frequency Range868~928MHz
Output Power10mW
Antenna1/4λ wire antennaGain of 2.14 dBi or less
Antenna PowerWithin 8 +20% -50%Contact (50 Ω)
Modulation SystemBinary FSK
Oscillation SystemPLL synthesizer system
Radio Communication Speed1200~250K bps
Number of Channels4800Channel span 12.5 KHz
Receiver Sensitivity-112 dBm (1200 bps)Packet error rate 1%
(253 bytes/1 packet)
Working Temperature-10℃ ~+70℃
Storage Temperature-30℃ ~+95℃
Consumption Current31mA I/O Port Open 
5mA I/O Port Close
Sleep mode 
(Operating Voltage 15V)
Consumption Current51mA I/O Port Open
25mA I/O Port Close
Standby mode 
(Operating Voltage 15V)
Consumption Current55mARF Operating mode
(Operating Voltage 15V)
Unit Weight140g
InterfaceRS232/485


UART Interface Specifications

ItemSpecification
Communication MethodSerial communication (RS232C format)
SynchronizationStart-stop (asynchronous)
Data Speed1.2K/2.4K/4.8K/9.6K /19.2K/38.4K/56K/115.2K bps
Other ParametersData length 8 bits, no parity, stop bits 1 or 2

TEL:+886-2-2735-3055

sales@rf.net.tw

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