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RS-485 is an electrical-only standard. Unlike comprehensive interface standards, which define functional, mechanical, and electrical specifications, RS-485 only defines the electrical characteristics of the controllers and receivers that could be used to implement a balanced multipoint transmission line. This standard, however, is intended to be referenced by higher-level standards, such as DL/T645, which defines the communication protocol.
for electronic energy meters in China, specifying RS-485 as the physical layer standard.
1. Heat resistant, flame retardant
2. Excellent insulation performance, stable chemical performance
3. Excellent transmission performance due to the use of high-quality polyethylene for braided cable shielding
4. Effective resistance to electromagnetic interference due to the use of a new type of aluminum foil, double-layer shielding of braided copper mesh.
RS-485 signals are used in a wide range of computer and automation systems. In a computer system, SCSI-2 and SCSI-3 can use this specification to implement the physical layer for data transmission between a controller and a disk drive. RS-485 is used for low-speed data communications in passenger vehicle buses in commercial aircraft cabins. It requires minimal cabling and can share cabling among multiple seats, reducing weight.
| Model NO | FROM(MM) | Length (m) | Maximum conductor resistance at 20℃ (Ω/KM) | Minimum conductor resistance at 70℃ (Ω/KM) |
| RS-485 2*0.5 | 5.5 | 100/200 | 39 | 0.012 |
| RS-485 2*0.75 | 6.0 | 100/200 | 26 | 0.010 |
| RS-485 2*1.0 | 6.6 | 100/200 | 19.5 | 0.010 |
| RS-485 2*1.5 | 7.5 | 100/200 | 13.3 | 0.009 |
| RS-485 2*2.5 | 8.7 | 100/200 | 7.98 | 0.008 |
| RS-485 3*0.5 | 5.8 | 100/200 | 39 | 0.012 |
| RS-485 3*0.75 | 6.3 | 100/200 | 26 | 0.010 |




By Joanne from Sheffield - 2018.02.04 14:13
By Phoebe from Albania - 2018.06.19 10:42 




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