Sales of RS485 communication cable production

Tianjin Cable Factory has always followed standards, adhered to industry production norms, catered to customers' actual requirements, and upheld the honest business attitude of Tianjin Cable personnel.40Over the years, an influential cable brand has been established in the national market. Promote the pace of cable price reform,Beneficial for the long-term development of the cable industry. Green and environmentally friendly cables, also known as green cables, clean cables, pollution-free cables, environmentally friendly cables, etc., are widely promoted cable varieties in the world today. Their characteristic is that they will not cause environmental pollution throughout the entire life cycle of product manufacturing, use, and disposal.

RS485 communication cableRS485 communication cable

RS-485In general, communication cables can use twisted pair cables, but in environments with higher requirements, shielded twisted pair cables can be used. in useRS485When communicating, for a specific transmission line, the host (calling device) is connected to the instrument485The length of the cable between ports is inversely proportional to the baud rate of data signal transmission; This length is mainly affected by signal distortion and noise. theoreticallyRS485The transmission distance can reach1200Meter, but in practical applications, the transmission distance should be less than1200The specific length of meters is affected by the surrounding environment.
Sexual impedance is120ΩThe twisted pair shielded cable is widely usedRS485/422TheCANBUSWaiting for the bus,RS485There are many specifications for communication cables, including cable laying environment, communication speed, and relay free transmission distance. The general recommendations are as follows:
Ordinary twisted pair shielded cableSTP-120Ω（for RS485 & CAN）one pair 20 AWGCable outer diameter7.7mmabout. Suitable for indoor, pipeline, and general industrial environments. When in use, one end of the shielding layer should be grounded!

Ordinary twisted pair shielded cableSTP-120Ω（for RS485 & CAN）one pair 18 AWGCable outer diameter8.2mmabout. Suitable for indoor, pipeline, and general industrial environments. When in use, one end of the shielding layer should be grounded!

Armored twisted pair shielded cableASTP-120Ω（for RS485 & CAN）one pair 18 AWGCable outer diameter12.3mmabout. Can be used in places with severe interference, frequent rodent infestations, and lightning and explosion protection requirements. When using, it is recommended to ground both ends of the armor layer and the innermost shielding end!

Sexual impedance is100ΩThe twisted pair shielded cableSTP-100Ω(for FF & PROFIBUS-PA) one pair 18 AWGApplied toFFThePROFIBUS-PABus, commonly used18AWGConductor.

When storing cables, please pay attention to the following points:

1.The newly added whole cable is sealed with plastic sealing sleeves at both ends when it leaves the factory. However, after using up a section according to the actual situation at the construction site, the remaining part is simply wrapped with plastic cloth to cover the fracture. Due to poor sealing and outdoor placement, over time, it is inevitable that moisture will seep into the cable.
2.When laying cables, it is necessary to frequently cross roads, bridges, culverts, etc. Due to weather or other reasons, a lot of water often accumulates in the cable trench. During the laying process, it is inevitable that the cable head will be immersed in water, and water will enter the cable due to loose or damaged plastic wrapping; In addition, during traction and threading, sometimes the outer sheath or even steel armor may be scratched, which is particularly prominent when using mechanical traction.
3.After the cable laying was completed, due to the limitations of on-site construction conditions, the cable head could not be made in a timely manner, resulting in the unsealed cable fracture being exposed to air for a long time, and even immersed in water, causing a large amount of water vapor to enter the cable.
4.During the production process of cable heads(Including terminal heads and intermediate connectors)Due to the negligence of construction personnel, the newly processed cable ends sometimes accidentally fall into the accumulated water on site.
5.cable and wireDuring normal operation, if a breakdown or other fault occurs for some reason, the accumulated water in the cable trench will enter the interior of the cable along the fault point; In civil construction, especially in construction sites that use large construction machinery, cable damage or breakdown accidents caused by various human factors are not uncommon. When such accidents occur, the insulation of the cable is severely damaged, which can also cause water to enter the cable. After the cable enters the water, it will undergo water tree aging under the action of the electric field, ultimately leading to cable breakdown. Water trees have a diameter of0.1mA collection of pores filled with water up to a few micrometers. The impurities, pores, and uneven bonding surfaces between the insulation and the inner and outer semiconducting layers that form local high electric field sites are the starting points for the occurrence of water trees.