RS485 Communication Cable

Product Overview

This RS485 communication cable is designed for Modbus RTU serial communication between DCS, SIS, PLC, CCS, MMS and other systems. Balanced transmission and differential reception support long-distance, multipoint half-duplex communication in industrial and building automation networks.

Applications

• Modbus RTU communication between DCS, PLC, SIS, CCS and MMS systems.
• Industrial and building automation control networks.
• Field links from tens of metres to several kilometres requiring common-mode noise suppression.

Product Features

• Rated voltage: 300/500V; long-term conductor temperature: 70℃.
• Transmission speed: 10Mbps with half-duplex operation.
• Balanced transmission and differential reception help suppress common-mode interference and detect signals as low as 200mV.
• Metal-tape shielding, metal-wire shielding and steel-tape or steel-wire armour are available.
• Long-term bending radius: no more than 12D for metal-tape-shielded or armoured cables and 8D for metal-wire braided cables.

Key Parameters

Item	Specification
Standards	IEC 61158-2-2010, T/HGJ 12400-2021 and T/CES 100-2022
Operating capacitance at 1kHz	Core-to-core ≤85pF/m; core-to-shield ≤115pF/m for 0.5-1.0mm² or ≤125pF/m for 1.5mm²
Capacitance unbalance to earth	≤500pF/km
Characteristic impedance at 31.25kHz	100±20Ω
Attenuation	≤3.0dB/km at 39kHz; ≤0.5dB/km at 1kHz for 22AWG
AC withstand test	1kV/1min
Insulation resistance	At least 3000MΩ·km at 20℃
Propagation delay difference	≤1.7μs/km at 7.8-39kHz

Construction Codes

P/P1/P3/P4 indicate shielding methods, 2/3/9 indicate steel-tape, steel-wire or steel-wire-braided armour, V/Y indicate PVC or PE/polyolefin sheath and R indicates flexible construction.

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