Overview
| Model NO. | RS-485 ，Modbus | Application | Modbus & BACnet Networks，PLC & SCADA Systems，CCTV & Security Control，Renewable Energy Tracking |
| Voltage | Low Voltage | Conductor | Tinned Copper |
| Insulation Material | PE | Jacket | PVC |
| Material Shape | Round | Temperature |
-20°C~70°C
|
| Certification | ISO, CCC, CE, RoHS, VDE | Conductor Type | Class 5 Flexible |
| Brand | ZhongYI | Voltage Type | 300/500V |
| Company Name | ZHONGYI Cable Co., Ltd | CORE | Twisted Pairs |
| Transport Package | Plastic Packaging and Cardboard Boxes | Specification | 0.2 mm² – 0.75 mm² |
| Origin | HEBEI China | Color | Black (or as requested) |
RS-485 / Modbus Wire Core Technical Specifications & Data Sheet
| Model / No. of Pairs | Conductor Size (AWG) | Shielding / Shield Type | Characteristic Impedance (Ω) | Nominal Outer Diameter (mm) | Voltage Rating (V) | Nominal Velocity of Prop. (%) |
|---|---|---|---|---|---|---|
| 1 Pair (2 Cores) | 24 AWG (7×0.20mm) | Al Foil + Tinned Copper Braid | 120 ± 15 | ~ 5.9 | 300 V | 66% |
| 2 Pairs (4 Cores) | 24 AWG (7×0.20mm) | Al Foil + Tinned Copper Braid | 120 ± 15 | ~ 8.7 | 300 V | 66% |
| 1 Pair (2 Cores) | 22 AWG (7×0.25mm) | Al Foil + Tinned Copper Braid | 120 ± 15 | ~ 7.1 | 300 V | 66% |
| 2 Pairs (4 Cores) | 22 AWG (7×0.25mm) | Al Foil + Tinned Copper Braid | 120 ± 15 | ~ 10.4 | 300 V | 66% |
Features
RS-485 / Modbus Cable serial with Closely similar to those Cable Comparison Table
| Cable Type / Protocol | Characteristic Impedance (Ω) | Typical Shielding Structure | Standard Gauge (AWG) | Primary Industrial Protocol | Global Benchmark Model | Key Tech Difference vs RS-485 |
|---|---|---|---|---|---|---|
| RS-485 Cable | 120 Ω | AL Foil + Tinned Copper Braid (Dual Shield) | 24 AWG / 22 AWG | Modbus RTU, BACnet MS/TP | Belden 9841 / 9842 | Baseline (Standard 120Ω bus) |
| Profibus PA | 100 Ω | AL Foil + Tinned Copper Braid (Blue Jacket) | 18 AWG | Profibus PA (Process Automation) | Belden 3076F | Lower impedance (100Ω) but thicker conductors for intrinsic safety. |
| Profibus DP | 150 Ω | AL Foil + Tinned Copper Braid (Purple Jacket) | 22 AWG (Solid cores) | Profibus DP (Decentralized Periphery) | Belden 3079A | Higher impedance (150Ω) for ultra-high speed (12Mbps) Siemens factory automation. |
| CAN Bus Cable | 120 Ω | High-density Tinned Copper Braid | 22 AWG / 20 AWG | CANopen, DeviceNet | Belden 3105A | Same 120Ω impedance, but requires higher signal propagation speed for automotive/motion control. |
| RS-232 Cable | Not Defined (Low) | Overall AL Foil Shield (Often non-twisted) | 24 AWG | Point-to-point Serial (Com Port) | Belden 9534 / 9536 | Non-differential signal, only for short distance (<15m) point-to-point connections. |
120Ω Characteristic Impedance: Perfectly matched for RS-485 serial networks to eliminate signal reflection and data corruption.
Dual-Layer Shielding: Aluminum foil plus high-density tinned copper braid provides 100% EMI/RFI protection.
Precision Twisted Pairs: Drastically reduces crosstalk and balances differential signal transmissions over long distances.
Low Capacitance PE Insulation: Ensures minimal signal attenuation and high-speed propagation velocity.
Industrial Durability: Oil-resistant, flame-retardant PVC or LSZH outer jacket for stable performance in harsh environments.
Application
Modbus & BACnet Networks: Connecting industrial controllers, smart meters, and smart HVAC automation sensors.
PLC & SCADA Systems: Reliable multi-drop data links between programmable logic controllers and central surveillance.
CCTV & Security Control: Transmitting pan-tilt-zoom (PTZ) commands to remote security cameras over extended bus lines.
Renewable Energy Tracking: Linkages for solar inverter monitoring systems and wind turbine data arrays.
Certification
Factory
FAQ
1. Why is a strict 120-Ohm characteristic impedance mandatory for RS-485 Modbus networks?
Signal Reflection & Echo Elimination:
Our RS-485 communication cable is meticulously engineered to maintain a stable 120 ± 15 Ω characteristic impedance across extended lengths. In serial multi-drop networks, any variance in impedance creates heavy signal reflections and data echo. By perfectly matching the transceiver architecture, our 120 Ohm balanced twisted pairs guarantee zero data packet loss, eliminating data corruption in critical PLC, SCADA, and automated BACnet building control setups.
2. What technical protection does the dual-layer (Al Foil + Tinned Copper Braid) shield provide?
Comprehensive EMI & RFI Mitigation:
Industrial manufacturing facilities are heavily congested with electromagnetic interference (EMI) and radio frequency noise emitted by heavy motors and variable frequency drives (VFDs). Our RS-485 wire features a robust dual-layered shield: an aluminum foil wrap providing 100% electrostatic coverage, paired with a high-density tinned copper wire braid. This composite armor channels high-frequency noise directly to ground, securing crystal-clear data transmission.
3. Why does this Modbus communication wire utilize PE insulation instead of standard PVC?
Low Capacitance & High Propagation Velocity:
Standard Polyvinyl Chloride (PVC) insulation possesses a high dielectric constant, which limits transmission speeds over long bus lines. Our serial bus cables utilize premium, low-density Polyethylene (PE) insulation instead. This advanced compounding ensures ultra-low mutual capacitance, minimizing high-frequency signal attenuation and ensuring a high nominal velocity of propagation (66%), permitting error-free differential signaling up to 1200 meters.
4. Is your RS-485 serial cable fully compatible with global standard communication benchmarks?
Cross-Brand Equivalence & Strict Compliance:
Yes. ZHONGYI CABLE manufactures RS-485/Modbus lines to serve as direct, drop-in engineering equivalents to industrial benchmarks such as Belden 9841 (1-Pair) and Belden 9842 (2-Pairs). Operating perfectly under low-voltage 300/500V thresholds, every production batch strictly complies with IEC 60332 flame-retardant parameters and undergoes sweeping AC voltage withstand tests to guarantee bulletproof reliability across cross-border industrial integration projects.
5. What cross-sectional sizes and wholesale logistics packaging does your factory offer for serial cables?
B2B Project Packaging & Secure Shipping:
To preserve the delicate physical twist and avoid crushing the precise internal geometry during maritime transport, our RS-485 communication wires are tightly coiled on easy-pull cardboard drums or sturdy wooden reels (spanning 24 AWG and 22 AWG gauges). As a direct manufacturer, we offer customized outer jackets (such as standard Chrome Grey or LSZH safety compounds) and support sequential meter-marking prints for large-scale engineering layouts.
Related
