Star Wiring Design in RS-485 Bus Large-scale System under Complicated Electromagnetic Field Environment
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TD-1204 is a RS-485 hub (also known as RS-485 bus segmentation concentrator, RS-485HUB). It is professionally designed by Shenzhen Tiandi Huajie Technology Co., Ltd. to solve the star wiring in the large-scale RS-485 bus system under the complex electromagnetic field environment. The RS485 hub uses two-way transparent transmission. The RS485 hub can divide one RS-485 or one RS-232 bus into four RS-485 buses, or converge four RS-485 signals into one RS-485 or one RS-485 bus. The 232 bus is coming up. And each port has independent optical isolation, short circuit, and open circuit protection functions. When the system fails, the built-in controller can cut off the faulty port in time. Make the RS485 hub ensure that each port can work independently, and achieve the effect of not interfering with each other. Each port can be connected to 32 contacts at the same time, which can extend the RS-485 signal by 1200 meters. It is the best choice to change the single structure in RS-485 bus wiring.
>>Product features:
1. The input end provides two RS-232 and RS-485 interfaces, and the output end provides four RS-485 interfaces
2. The communication rate is adaptive to 300～115200bps, eliminating the trouble of manually setting the baud rate
3. Each RS-485 interface is equipped with lightning and surge protection functions, and each RS-485 interface is isolated from each other and does not interfere with each other.
4. The power supply is an external power supply method, which provides two power supply methods: concentric sockets and dual-terminal binding posts.
5. Multiple TD-1204 can be cascaded in five levels, and the maximum expansion of 256 RS-485 buses.
6. Each interface can be connected to 32 standard RS-485 devices (nodes)
7. With zero-delay automatic transceiver conversion function
8. Unique automatic circuit detection function
9. Support hot plug function, plug and play
10. Any application software that can adapt to users
11. Can be used as four RS-232 to RS-485 converters
12. Adaptive communication rate function
>>Technical parameters:
◆ Interface standard: Compatible with RS-232C and RS-485 standards of EIA/TIA
◆ Communication rate: 300～115200bps adaptive
◆ Communication distance: Each communication port can extend your network by 1200m
◆ Data flow control: RS232 port of function multiplexing port (COM) does not need RTS/CTS hardware flow control, it is automatic flow control
◆ Interface features: 4 independent RS-485 signal output, each interface is independent of each other
◆ Connecting equipment: Multi-machine communication 32, 64, 128 nodes
◆ Electrical interface: RS-232 (DB9 female), RS 485 (terminals)
◆ Transmission medium: Super Category 5 twisted pair shielded wire or RS-485 dedicated wire
◆ Working mode: Asynchronous work, point-to-point or multi-point, 2-wire half-duplex
◆ Isolation degree: isolation voltage 3500V
◆ Transmission distance: RS-485 end is 1200 meters, RS-232 end is recommended not to exceed 5 meters
◆ Dimensions: 140L*130W*30H mm
◆ Operating environment: temperature: -20℃-60℃, humidity: 5%-95%
>>Application areas:
Industrial control automation, road traffic control automation, smart cards, time attendance, access control, meal sales systems, industrial distribution systems, closed-circuit monitoring, security systems, POS systems, building automation systems, self-service banking systems. Telecommunication systems, banks, insurance systems, remote distributed equipment control, intelligent automatic alarms and fire-fighting linkage systems, building automatic control systems, large-scale retail systems, network appliances, etc.
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