RS485-HUB-8P
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Overview
Introduction
RS485-HUB-8P is an industrial grade isolated RS485 hub that can expand 8-ch RS485 slave ports through 1-ch RS485 master port and can realize relay, extension, and isolation functions of RS485 network, with screw terminal for power input. Rail-mount case design, easy to install, and cost-effective. It is suitable for applications like data acquisition, IoT gateway, safety & security IoT, and intelligent instrument monitoring...
Specification
| Interface Standard | Compliant with RS485 Standard |
|---|---|
| Physical Interface | RS485 Screw Terminal |
| Baudrate | 300~460800bps (self-adaptive) |
| Supported Nodes | Each RS485 port supports up to 32 nodes |
| Communication Distance | 1200m (9600bps), the higher rate the shorter distance |
| Operating Method | RS485 two-wire (A, B), half-duplex transparent transmission |
| Power Supply | DC 9~24V |
| Operating Temperature | -45 ~ +85℃ |
| Environment Humidity | <95%RH |
| Transmission Medium | Normal parallel cables/twisted-pair cables |
Interface Introduction
| Onboard Resource | Description |
|---|---|
| +9～24V, GND | Power Screw Terminal |
| OUT1A～OUT8A, OUT1B～OUT8B | RS485 Slave Port 1～8 |
| 485A, 485B | RS485 Master Port |
| P1～P8 | RS485 1～8 Slave Port Data Receiving Indicator |
| RXD | 485 Master Port Data Receiving Indicator |
| TXD | 485 Master Port Data Transmitting Indicator |
| POWER | Power Indicator |
Function Description
Extension
When the master RS485 device needs to connect 8x RS485 slaves in a star connection, connect the master to the RS485-HUB-8P master port and the slaves to the RS485-HUB-8P slave port. It can prevent interference between RS485 and isolate effectively.
Isolation
By connecting one end of the RS485 to the RS485 master port and the other end to any RS485 slave port, the RS485 cable is effectively isolated and protected from lightning strikes and interference. The other end of RS485 is effectively protected from damage by high voltage and strong current.
Relay
When the RS485 cable exceeds a long distance such as 1200 meters, the signal will be attenuated and interference will increase. By using RS485-HUB-8P, the communication distance can be extended.
Hardware Connection Diagram
Outline Dimensions
FAQ
It is a one-host-eight-slave device, purely hardware wiring. Three prerequisites need to be met:
- Consistent serial port parameters;
- The communication protocol is half-duplex, with a question-and-answer format, such as the Modbus RTU protocol;
- Different device addresses. The RS485 slave port can connect 7 to 1 RS485 device, or it can be connected to a single RS485 bus.
- The scan cycle time set by the program cannot be too short. Adjust the time as long as possible to ensure that it has sufficient response time.
- Do not connect to the host's 485 interface side by side. Use handshake cascade connection, as shown in the figure below:
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- The device is mainly an external device for the physical layer and does not involve specific communication protocols, but rather ensures that the electrical characteristics of the RS485 standard are supported at the hardware level, such as differential signal transmission, multipoint communication, etc.
- The device itself does not contain any features that can change the role of the device or control the communication protocol, it is just a transparent transmitter of the signals.
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Support
Technical Support
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