Промышленный уровень 485 фотоэлектрический изолятор RS485 усилитель повторителя расстояния для борьбы с помехами и перенапряжением.

Промышленный уровень 485 фотоэлектрический изолятор RS485 усилитель повторителя расстояния для борьбы с помехами и перенапряжением.

Brand NameNoneOriginMainland ChinaCertificationNONEMeasurement unitpiece/piecesEach pack1

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Description

Isolated typeRS485Repeater

one ：Product introduction

Isolated typeRS485ERepeater is a high performance industrial gradeRS485Signal amplifier extender。The product can automatically sense the direction of data flow and baud rate of communication，No control or handshake signal is required，Ensure data transparent transmission。Equipment power supply and communication signal are completely isolated，It also has surge protection、Electrostatic protection and other measures。It has the advantages of long transmission distance、High speed、Stable and reliable performance。Widely used in attendance machine、ICCard charging system、Automatic control、Access control system、Parking lot、Canteen selling system、Highway toll system。

two ：Product features

1、Industrial Design，Communication is completely isolated，Stable and reliable performance，Transmission ratemostthe height is115.2Kbps；

2、Built in high qualityDC/DCIsolated power module，Achieve electrical isolation between ports；

3、Support multi machine communication，Maximum number of connections128Nodes，Maximum transmission distance1200rice；

4、Data stream automatic control technology，Automatic identification and control of data transmission direction；

5、Multiple protection measures：Positive and negative15KVOfESDprotect，600WTwo wayTVSprotect2.5KVCommunication isolation；

6、Wide range of power supply9-36VDC，And it has anti reverse connection protection；

three：Electrical parameters：

RS485EThe equipment is suitable for long-term stable operation under the recommended value；The equipment will not be damaged when it works under the limit value，But it can lead to performance degradation；Do not exceed the limit at any time，Otherwise, the equipment may be damaged!

four：485Wiring precautions：

1. 485The communication line must be shielded twisted pair,It's better to reserve more shares，Total length not more than1200rice。

2. Keep wiring away from high voltage wires，Do not run in parallel with the power cord，It can't be tied together。

3. 485The bus must be a hand-in-hand bus structure,Star connection and bifurcated connection are strictly prohibited。

4. go beyond30Set of controllers or line length greater than500rice，Must use485Repeater。

5. AC power supply equipment and chassis must be truly grounded,And the grounding is good。

6. Use shielded wire to connect all485EquipmentGNDConnect them together。

five：Communication adoptionRS-485Wire selection requirements of bus：

use2Core shielded twisted pair

copper ，Wire diameter0.5～0.75square millimetre，

impedance38～88Ohm/kilometre，

Capacitive reactance30～50NAFA/kilometre，

Stranding distance20Millimeter2Core shielded twisted pair(If the distance of the line does not exceed500Meter can reduce the standard of line appropriately，But it must be twisted pair）

six：Bus limitation：

Consists of two or more devices that are physically connected to each other，Maximum allowable hook on bus128Devices，Without repeater，The bus length is not greater than1200rice。There should be no branching of the system bus，If the branch is inevitable，The following requirements must be met：

1.Branch length is not greater than10rice；The sum of bus lengths shall not exceed800rice；The total number of equipment on the branch line shall not exceed50individual。

2.All communication signal lines shall be kept away from interference sources as far as possible，Signal line should go through weak current well，Can't compete with strong current（as220V residential power supply）Or RF signal line（asCATV、Large signal audio cable）Parallel routing，If parallel routing，The distance should be greater than0.5rice。

3.The joints of all lines must be connected by welding or screw clamping，And do waterproof and moisture-proof treatment，for example，The butt joint can be tightly wrapped with waterproof tape or sealed with epoxy resin after welding。

seven：Signal common ground：

1.All devices in the same network segment must have a unified signal ground，To avoid common mode interference。

2.Centralized power supply，Connect all power supplies on the same network segment（Including the power supply of communication equipment）The negative pole of DC is directly connected together to form a common signal ground，

At this time, the signal ground is the DC power ground。

3.When single power supply is independent，Connect all bus devices in the same network segment to the ground（Black line）The pins are connected together，Thus, the common signal ground is formed。

eight：Wiring diagram

size：97*50*31 weight：66G

nine：Recommend several debugging methods：

First of all, make sure that the equipment wiring is correct，And strictly conform to the specification：

1、Common land law：use1A single wire or shielded wire will connect all485EquipmentGNDConnect them together，In this way, the potential difference between all devices that affects communication can be avoided。

2、Middle section disconnection method：Through the disconnection from the middle, check whether the equipment load is too much, the communication distance is too long, and the damage of a certain equipment affects the whole communication line。

3、Single pulling method：Pull a line to the equipment temporarily，This can be used to eliminate whether the wiring caused the communication failure。

4、Replacement of converter：Take a few converters with you，In this way, it can be ruled out whether the converter quality problem affects the communication quality。

5、Notebook debugging method：First, make sure that your laptop is a normal communication device，Replace client computer，To communicate，if possible，It indicates that the serial port of the client's computer may be damaged 。