10% OFF!!! Buy Industrial isolated Active RS485 repeaters RS485 Amplifier only US $16.20.

Industrial isolated Active RS485 repeaters RS485 Amplifier

Price US $16.20 18.00 / 1 piece 10% OFF
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Brand Name : Jedrek
Model Number : RS485 Amplifier
Interface Standard : EIA/TIARS-232C, RS-485
RS232 : 300bps-120kbps
RS485/RS422 : 300bps-1Mbps
RS-422/485 : 0-1.2Km
NODE : 32
Isolation voltage : 1500V
Lightning protection voltage : 6-7V
Lightning protection capacity : 600W/ms



Industrial Active RS485 repeaters RS485 Amplifier isolated 

485 Repeater Product Description:

Product Description
Active Isolated RS485 repeaters ( 
485amplifiers   485 isolator extender ) is a professional place for the high demands of the development of a customized product . Product is compatible with industry standard RS485 . RS485 differential signals used for communication to extend communication distance and communication isolation , you can extend the RS485 signal about 1,500 meters or additional 256 nodes. While DC-DC power supply isolation , communication signals , such as multiple isolated RS485 communications to provide effective protection . Repeater use simple, only the repeater access communication network, does not require the use of additional control data flow , the converter automatically control the flow of data transmission and reception . The communications transmission process is completely transparent. The product is in accordance with the concept of industrial control standards for the design, supply completely isolated ! Communication is completely isolated ! Interference ability , long transmission distance , high speed , stable characteristics. Is widely used in attendance machine, IC card charging systems, industrial automation and control systems, card access control systems, parking systems, automated banking system , bus charging system , canteen Canteen system , highway toll station systems. RS485 communication applications is a relatively special applications, often must be combined with on-site environment , cabling, electrical equipment make the final adjustments. So buy site RS485 product users, the practical application of what problems can contact us promptly , we will provide appropriate technical support services !


1 , active isolation, built-in industrial grade DC-DC isolated power modules to achieve electrical isolation between portsFrom ;
2 , communication isolation , using imported fully isolated 485 chip to ensure communication is completely isolated, anti-interference ability , communication distance ;
3 , professional interface data flow control technology , automatic identification and control data transfer direction ;
4,1500 W surge protection , 15KV ESD protection , 2500V communication isolation ;
Communication parameters:
Meet : EIA RS-485 standard
RS-485 signal : A +, B-
Work:Asynchronous transmission , point to point , multipoint, two -wire half duplex
Transmission media:Ordinary wire , twisted pair or shielded cable is recommended to use shielded twisted pair wire or dedicated communication
Baud rate : 300 ~ 115200bps, automatically detecting the serial signal baud rate
Direction control: automatically determine the direction of automatic control of data transmission
Transmission distance: 1500 m
Communication protocol: transparent transmission
Interface protection : 1500W surge protection , 15KV ESD protection , 2500V communication isolation , anti-lightning
Working environment : 0 ~ 60 , relative humidity 5 % to 95%
Cascade : RS485 side can cascade up to enhanced RS485 devices 256 . ( Practical applications can depend on the number of cascaded devices used in other devices
485 chip type, the current general 485 chips can be cascaded to 32 communication nodes , enhanced cascade up to 256 communication nodes. Of course , the practical application
Also the number of nodes that can be achieved and communications environment , wire, communication distance and communication rate have a relationship ) .
Power supply:
Input Power : DC9 ~ 24V wide range DC voltage input
Power consumption: about 40mA static and dynamic 60mA
Length × width × height : 82 × 50 × 32mm
Case : high quality plastic shell , insulation high safety factor
Color: Light Gray
Weight: 68 g

A , 485 Wiring Precautions :

1.485 communication lines must be shielded twisted pair , the best multi-strand spare , total length does not exceed 1200 meters.
2 wiring as far away from power lines , and power lines not parallel , but not bundled together.
3.485 bus must be a hands -style bus architecture , and resolutely put an end to star connection and branching connections.
4 out of 30 controllers or lines longer than 500 meters , 485 repeater must be used .
5 AC-powered equipment and chassis ground must be true , but a good grounding .
6 shielded cable to ground all 485 devices connected to GND .
7 In the last one 485 + 485 , and 485 devices - on and connected 120 ohm termination resistors.
Communication using RS-485 bus wire selection requirements:
Use two -core shielded twisted pair
Copper , diameter 0.5 to 0.75 mm2 ,
Impedance of 38 to 88 ohms / km ,
30 to 50 nF capacitance / km ,
Twist pitch of 20 mm 2 core shielded twisted pair ( if the line distance of not more than 500 meters
The standard line can be reduced , but it must be a twisted pair
Second, the system bus :
By two or more inter- connected device with a physical component , allowing up to 128 articulated bus devices without repeater in the case of bus length
Not more than 1200 meters.
Third, the system bus should be no bifurcation , such as branch unavoidable , you must meet the following three requirements:
branch lengths of not more than 10 m;
bus length and no more than 800 meters ;
The total number of branch lines shall not be more than 50 devices .
All communication signal lines should be kept away from sources of interference, signal lines should go weak wells , not with strong electricity ( such as the 220 -volt residential power ) or radio frequency signal lines
( Such as CATV, large-signal audio cable ) and parallel lines , and parallel lines if , distance should be greater than 0.5 m .
all lines or contacts to be welded tight connection Luo Sika , and a waterproof and moisture treatment , for example, the contact will be welded with waterproof glue
Belt wrapped tight or sealed with epoxy resin .
Fourth, the signal common ground :
the same for all devices on a network segment must have a uniform signal ground to avoid common mode interference .
centralized power, the same segment of all power ( including communications equipment, its own power supply ) directly connected with the negative pole of the DC component common signal ground ,
At this point the signal ground that the DC power ground.
Single- family independent power supply, put on a different subnet to all bus devices ( black line ) pin connected together, which formed a common signal ground.
Bus using wire recommended selection

Recommend several debugging method :

First make sure the wiring is correct equipment and strict normative :
1, the same GND method: using a cable or shielded cable to the GND of all 485 devices connected together, so that all devices to avoid affecting the communication between the electric potential difference .
2 , the terminal resistance method : In the last one of the 485 + 485 devices , and 485 - and connected on 120 ohm termination resistors to improve the communication quality.
3 , the middle segment disconnect method : By disconnecting from the middle to check whether it is long distance communication device load too much damage to a device on the whole the impact of communication lines and other reasons .
4 , a separate cable method : Simple temporarily pull a separate line to the device , which can be used to rule out whether the wiring caused the communication failure .
5 , the replacement converter method : carry several converters , so you can rule out whether the converter quality issues affecting the communication quality.
6 , notebook debug way: first, to ensure their own portable laptop is the normal communication equipment, replacement client computers to communicate , if you can , then the client computer's serial port may be damaged or injured.

Note This product is no output load resistance , load resistance due to the use of different occasions , when using please bring your own load resistor , typically 120 ohms.











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  •  Original packaging and accessories produced by the manufacturer.
  • One Year Warranty from the date of shipment


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  • We ship to Worldwide, and the Approx Delivery Time is referred as below:


Approx. Delivery time


2-5 working days


5-8 working days

China Post Air Mail


US, UK, AU, Singapore,etc.

12-20 working days

Canada,New Zealand,etc.

15-22 working days

India, Germany,Israel,Spain, etc.

may take up to 4-6 weeks due to strict Custom Inspection

Russia, Brazil,Italy, France, Eastern Europe,etc.

may take up to 6-8 weeks due to strict Custom Inspection

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