RS232/RS-485 detailed description of communication lines 

 RS232/RS-485 communication lines for EIA RS-232/422 communication network, is building automation, industrial control networks, electric power automation communication network commonly used cable types. 


 1, 1-line for standard RS-485 communication cable, the characteristic impedance of 120 ohms, the conductor is 2 * 24AWG stranded tinned copper, PE insulation medium, the aluminum foil / polyester composite with 100% tin cover + A total of 90% coverage copper heavy shielding, with a separate ground wire, industrial gray PVC outer sheath, in line with UL 2919 document. 

 Superior product performance, can be applied to complex industrial automation and building automation control network communication network communication. 

 2, standard 2-wire of the RS-485 communication cable. 

 Product Specifications: 120 ohm characteristic impedance, 2 conductor wire for the 4-core (2x2x24AWG) stranded tinned copper, PE insulation jacket; as applied to complex industrial noise environments, especially the use of aluminum foil / polyester composite with 100 % + tinned copper shielding rate of 90% of the preparation of net rate of double shield shield, together with independent TC grounding conductors, industrial gray PVC outer sheath, meet UL AWM 2919 file specification. 

 RS-485 communication cable using twisted pair in the general situation can be, but in high demand environment can be used with a layer of twisted-pair cable. When using the RS485 communication for a particular transmission line, the host (called test equipment) to the 485 meter cable length between the baud rate and data signal transmission is inversely proportional; this length is mainly affected by signal distortion and noise impact impact. Theoretically RS485 transmission distance can reach 1200 meters, but the actual application of the transmission distance to less than 1,200 meters, the specific length that the surrounding environmental impact. 

 9842-type communication cable, is in strict accordance with standard RS-485 communication protocol design and production of standard products, not only Rockwell (AB) automation control network designated DH-485 model, is also a standard 2-wire CAN bus cable.