Because of its simple wiring, stable and reliable, 485 bus is widely used in anti-theft alarm, video surveillance, access control intercom, etc., but in the 485 bus wiring process, due to a lot of inaccurate concepts lead to many problems, In a variety of sites, the 485 bus is relatively prone to failure. Now the 485 bus is prone to failure and can be troubleshooting methods are as follows:
1. Since the 485 signal uses a pair of unbalanced differential signals, it means that each device in the 485 network must be connected to the ground through a signal loop to reduce the noise on the data line. Therefore, the data line is preferably a twisted pair cable. Make up, and add the shielding layer as the ground wire outside, connect the 485 equipment of 485 network, and reliably ground at one point.
2, in the industrial scene, the scene is very complex, there is a high common-mode voltage between each node, 485 interface uses a differential transmission mode, there is resistance to common-mode interference, but when the common-mode voltage is greater than +12V or less -9V exceeds the limit receiving voltage of the 485 receiver. The receiver will not work and may even burn the chip and the device together. The 485 optically isolated repeater can be used in the 485 bus to completely isolate the 485 signal and power supply, thereby eliminating the effects of common-mode voltage.
3,485 bus With the extension of the transmission distance, echo reflection signals will be generated. If the transmission distance of the 485 bus exceeds 100 meters, it is recommended that the terminating resistor at the beginning and end of the 485 communication be 120 ohms during construction. Related wiring method can refer to the following figure:
4,485 bus 485 nodes to minimize the distance between the trunk, the general recommendation 485 bus using hand-bus topology. The star structure will produce reflected signals, affecting the quality of 485 communications. If in the construction process, 485 nodes must be required to exceed the distance from the trunk of the 485 bus over a certain distance, the 485 bus hub product of Shenzhen Lekly Electronics Co., Ltd. can make a bifurcation of the 485 bus. Satisfy the use of star topology requirements during construction.
5, the factors that affect the load capacity of 485 bus: communication distance, quality of wire, baud rate, power supply of converter, lightning protection of 485 equipment, choice of 485 chip. If there are more 485 devices on the 485 bus, it is recommended to use a 485 converter with a power supply. When the passive 485 converter is stealing power from the serial port, the power supply capacity is not enough and the load capacity is not enough. If you choose a good wire, if you can use the baud rate as low as possible, choose a high load capacity of the 485 chip, can increase the load capacity of the 485 bus. The lightning protection in the 485 equipment will absorb the voltage and cause the 485 bus load capacity to decrease. Removing the lightning protection can increase the 485 bus load capacity. If the relevant factors cannot be changed during on-site construction, it is recommended to use an RS485 hub to provide the load capacity of the 485 bus.
1. Feature of Mother of Pearl
1), Exquisite pearl texture
MOP is the mother of pearl cultured all kinds of pearls, and the colors are natural and lustrous, elegant and charming.
2), Breath of the Oceans
Because of sea differing climate of the would's sea area, it cultivates natural and colorful mother of pearl. With special textures and shades, the colors of MOP are pearl white, golden, champagne, pink and mysterious black,etc.
3), Green and Natural
Mother of pearl cultures the pearl; It's very strict to the environment of growth waters, so the worldwide pearl farms select the fine-quality waters for breeding.
4), Enviromental protection and health
The vast majority of pearls are cultured. Also we have passed SGS certification, which shows our products are completely harmless to human health. It complys with the modern design concept of enviroment protection and returning to its original nature.
2, Production Process
One finsihed product needs at least 15 processes.
For resin, first cutting the resin panel into the required size, and chamfering the small panel to 45 degree or other angle. Then assemble the panels into a tissue box or other items by resin glues......
For mother of pearl, first selceting and polishing the raw material, then cut it into shell pieces, making then into same thickness and same size. Then sticking on the semi finished product by glues......
3, Packaging
1) Semi finished products in our warehouse;
2) Products ready for pack;
3) Use high quality copy paper & bubble wrap to cover each products;
4) Put single item into inner box, then into large carton;
5) Packed well and waiting for containers arrive! (carton can be with wooden frame as client's need).
4, FAQ
1), Are you products made from real mother of pearl, or just imitation?
Of course these are made from real and natural mother of pearls, and the colors are matural of shell themselves, which cannot be imitated, for it's pearl texture and lustre.
2), What are your main products?
Our main products are mother of pearl home & hotel supplies, including bathroon set, photo frame, Candle Holder, Mother of Pearl Boxes,etc.
3), What's your MOQ ?
For bathroom accessory set, MOQ will be 50sets; While for single product, MOQ will be 200pcs or 500pcs.
4), Can you send samples ?
Samples can be sent for evaluation , usually sample fee will be charged and you bear the freight cost. After you place official order to us with certain amount, sample cost can be refundable.
5), What's your lead time for samples and bulk order ?
Usually 5-10 days for samples, and 15-40 days for bulk order, just depending on the order quantity.
6), How can you make sure that the products arrive at the destination safely, without damage ?
Our package way is carton, inside is high quality copy paper and bubble pack for each item, also put into small inner box respectively, which can protect the items from damaging.
Mother of Pearl Tabel Lamp, Agate Table Lamp, Luxury Table Lamp, Elegent Hotel Table Lamp
Jiangxi Zhaojun Industrial Co.,Ltd , http://www.zhaojunshell.com