RS485 ASTP-120 signal line 2 * 2 * 1.5mm communication cable

RS485 ASTP-120 signal line 2 * 2 * 1.5mm communication cable

1、 Usage characteristics:

RS-485 data cable is used for communication between multiple points. Many devices can be connected through a signal cable. Just like earlier Ethernet networks connected by a coaxial cable. RS-485 data cable can transmit 1200 meters at a speed of 2.5MB/s and is used for complex communication networks such as building automation, industrial control networks, and power automation.

2、 Product specifications:

1-wire pair 2-core (2x24AWG) (2 * 0.2) (2 * 0.5) (2 * 0.75) (2 * 1.0) (2 * 1.5) multi stranded tinned copper wire with PE insulation sheath; To adapt to complex industrial noise environments, aluminum foil/polyester composite tape is specially used? +Tin plated copper braided mesh has a 90% shielding rate with dual shielding, and is equipped with an independent TC grounding conductor, an industrial gray PVC outer sheath, and a characteristic impedance of 120 ohms.

RS485 communication line structure:

1) Conductor: Stranded tinned copper wire with multiple strands, 7 per strand, each conductor wire diameter of 0.30mm, a total of four conductors, outer diameter: 0.91+/-0.03mm

2) Insulation: Solid core PE insulation, outer diameter: 1.90+/-0.03mm

3) Shielding: Aluminum foil shielding

4) Drainage wire: multi stranded tinned copper wire, 7 per strand, each conductor wire diameter of 0.30mm, a total of one strand, outer diameter: 0.91+/-0.03mm

5) Second shielding: Aluminum magnesium braided mesh shielding, with a coverage rate of 55%

6) Inner sheath: black PVC, OD: 8.0mm+/-10%

RS485 ASTP-120 signal line 2 * 2 * 1.5mm communication cable

RS485 has two types of wiring: two-wire and four wire. The four wire system can only achieve point-to-point communication and is rarely used. The two-wire wiring method is commonly used, which is a bus topology structure that can connect up to 32 nodes on the same bus.

In RS485 communication networks, the master-slave communication method is generally used, which means that one master has multiple slaves. In many cases, when connecting RS-485 communication links, it is simply necessary to use a pair of twisted pair cables to connect the "A" and "B" terminals of each interface, while ignoring the connection of the signal ground. This connection method can work normally in many situations, but it has buried great hidden dangers. The reason is common mode interference: RS-485 interfaces use differential transmission of signals, and do not need to detect signals relative to a reference point. The system only needs to detect the potential difference between the two wires, but it is easy to overlook that the transceiver has a certain common mode voltage range. The common mode voltage range of RS-485 transceivers is -7 to+12V. Only when the above conditions are met, can the entire network work normally; When the common mode voltage in the network line exceeds this range, it will affect the stability and reliability of communication, and even damage the interface; The second reason is the EMI problem: the common mode part of the output signal from the driver requires a return path. If there is no low impedance return channel (signal ground), it will return to the source end in the form of radiation, and the entire bus will radiate electromagnetic waves outward like a huge antenna.

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