Industrial and Instrumentation (I&I) applications often require the transfer of data between multiple systems over long distances. The RS-485 electrical standard is widely used in I&I applications.I&I applications include: industrial automation, process control, motor and motion control, remote terminals, building automation (HVAC HVAC, etc.), security systems and renewable energy.

In practical applications, lightning strikes, power induction, direct contact, power fluctuations, inductive switching and electrostatic discharge may generate large transient voltages that can cause damage to RS-485 transceivers.Socay has designed RS-485 protection solutions to assist engineers in ensuring that these designs can operate in environments with harsh electrical conditions

Application background

1. The RS485/232 wiring is very long, which is prone to overvoltage.

2. RS485/232 wiring is placed outdoors, which is easy to be struck by lightning

3. RS485/232 wiring is susceptible to interference from other lines

Socay Solution and Components

Thyristor Surge Suppressors(TSS)

TSS【P0080SB】Vdrm：6V；Vs：25V；Vt：4V；Idrm：5μA，Is：800mA，It：2.2A；Ih：50mA，Co：20-150pF，@10/700μS, 4KV

TSS【P0080SC】Vdrm：6V；Vs：25V；Vt：4V；Idrm：5μA，Is：800mA，It：2.2A；Ih：50mA，Co：20-150pF，@10/700μS, 6KV

Application

1. Monitoring / security system

2. Access control system

3. Railway signal control lamp

4. Intelligent transportation system

5. Electricity meter / water meter / instrument

6. Optical transceiver

The Solution Note

1.The solution uses TSS with very low residual voltage, which effectively protects the RS485/232 chip

2.The response time of TSS is ns level. When applied in this solution, it can prevent surge and discharge static electricity.

3.The junction capacitance of TSS is small, and the application in this scheme will not affect the transmission of the control line

4.The solution meets the surge standards such as IEC61000-4-5 and GBT17626.5

5.The solution complies with IEC61000-4-2, GBT17626.2 and other electrostatic standards

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