Condition:New
Type:Logic ICs
Product Parameter:
Size: 82mm × 50mmmm × 32mm
Weight: 260g
Interface protection: 1500W surge protection, 15KV static protection, 2500V communication isolation, lightning protection
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Working environment: 0 ° C ~ 60 ° C, relative humidity 5% -95%
Baud rate: 300~115200bps, automatically detect the baud rate of the serial port signal
Direction control: automatically discriminate direction and automatically control data transmission direction
RS-485 signal: A+, B-
Transmission distance: theoretically up to 1500m, but the actual environment has various interferences that do not reach the ideal value.
Communication protocol: pure hardware device, not subject to agreement
Working mode: asynchronous transmission, point-to-point, point-to-multipoint, two-wire half-duplex
Input power: DC9~24V wide range DC voltage input
Standard: EIARS-485 standard
Cascading: The RS485 terminal can cascade up to 256 enhanced RS485 devices. (The number of nodes that can be achieved in actual applications is related to the chip, communication environment interference, wire, communication distance, and communication rate).
product description:
RS485 Active Isolation Repeater (485 Amplifier 485 Isolator 485 Extender) is a product specially developed for high-demand places. The product is compatible with the RS485 industry standard. It is used to extend the communication distance of RS485 differential communication signal and to isolate the communication. It can extend the RS485 signal by about 1500 meters or add another 256 nodes. At the same time, DC-DC power isolation, communication signals and other multiple isolations provide effective protection for RS485 communication.
The RS485 repeater is simple to use, and only needs to connect the repeater to the communication network, and does not require additional control data flow in use, and the converter automatically controls the data transmission and reception flow direction. The entire communication transmission process is completely transparent. The product is designed in accordance with the concept of industrial control standards, the power supply is completely isolated! Communication is completely isolated! It has the characteristics of strong anti-interference ability, long transmission distance, high speed and stable operation. It is widely used in attendance machines, IC card charging systems, industrial automation control systems, card access control systems, parking systems, automated banking systems, bus toll collection systems, canteen selling systems, and highway toll station systems.
Features:
1. Active isolation type, built-in industrial grade DC-DC isolated power supply module to achieve electrical isolation between ports;
2. Communication isolation, using imported fully isolated 485 communication chip to ensure complete isolation of communication, strong anti-interference ability and long communication distance;
3. Professional interface data flow to automatic control technology to automatically identify and control data transmission direction;
4, 1500W surge protection, 15KV static protection, 2500V communication isolation;
Communication parameters:
Compliance: EIARS-485 standard
RS-485 signal: A+, B-
RS-485 signal: A+, B-
Working mode: asynchronous transmission, point-to-point, point-to-multipoint, two-wire half-duplex
Transmission medium: ordinary line, twisted pair or shielded cable. It is recommended to use shielded twisted pair or dedicated communication wire.
Baud rate: 300~115200bps, automatically detect the baud rate of the serial port signal
Direction control: automatically discriminate direction and automatically control data transmission direction
Transmission distance: 1500 meters
Communication protocol: transparent transmission
Interface protection: 1500W surge protection, 15KV static protection, 2500V communication isolation, lightning protection
Working environment: 0 ° C ~ 60 ° C, relative humidity 5% -95%
Cascading: The RS485 terminal can cascade up to 256 enhanced RS485 devices. (The number of devices that can be cascaded in actual applications depends on the type of 485 chip used by other devices. Currently, the common 485 chip can be cascaded to 32 communication nodes, and the enhanced type can be cascaded to up to 256 communication nodes. Of course, the actual The number of nodes that can be reached by the application is also related to the communication environment, wire, communication distance, and communication speed.
Working power:
Input power: DC9~24V wide range DC voltage input
Power consumption: static 40mA or so, dynamic 60mA
Appearance size: length × width × height: 82 × 50 × 32mm
Shell: high quality molded case, high insulation safety factor
Color: computer white
Weight: 68 grams
485 wiring considerations:
The 1.485 communication line must be shielded twisted pair, preferably multiple strands, with a total length of no more than 1200 meters.
2. Route the wiring as far away as possible from the high-voltage wires, not in parallel with the power cables, or bundle them together.
3.485 bus must be hand-held bus structure, resolutely eliminate star connection and fork connection.
4. Beyond 30 controllers or line lengths greater than 500 meters, 485 repeaters must be used.
5. AC power supply equipment and chassis must be grounded properly and grounded.
6. Connect the GND ground of all 485 devices with a shielded wire.
7. Connect the 120 ohm terminating resistor on the 485+ and 485- of the last 485 device.
Wire selection using RS-485 bus for communication:
Use 2-core shielded twisted pair
Copper, wire diameter 0.5~0.75 square mm,
Impedance 38~88 ohms/km,
Capacity resistance 30~50 nanofarads/km,
2-core shielded twisted pair with a 20 mm lay length (if the distance of the line does not exceed 500 m, the line standard can be appropriately reduced, but it must be a twisted pair.
