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RST/9R – RS232-RS485 RTS converter – Self-powered

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RSC/9R is an industrial electrical converter, RS232 to RS485 serial standard, self-powered via DB9 connector.

The device is completely Plug&Play, since it does not need any driver nor DIP switch. RS232 serial is Full Duplex, while RS485 is Half Duplex, with software controlled data direction, RTS (Request To Send). The RS232-RS485 serial converter automatically detects the transmission data rate up to 250 kbps, so it can be easily installed in any new or existing network.

It can be used to allow PC or industrial machinery to communicate with a RS485 network, from DB9 connector with set screws to 8-pins RJ45 connector.

SKU: RST/9R Category: Tags: , , , , ,
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Description

RSC/9R is an industrial electrical converter, RS232 to RS485 serial standard, self-powered via DB9 connector. It can be used to allow PC or industrial machinery to communicate with a RS485 network, from DB9 connector with set screws to 3-pins Mini XLR connector. The device is completely Plug&Play, since it does not need any driver nor DIP switch. RS232 serial is Full Duplex, while RS485 is Half Duplex, with software controlled data direction, RTS (Request To Send). The RS232-RS485 serial converter automatically detects the transmission data rate up to 250 kbps, so it can be easily installed in any new or existing network.

 

Use cases

Serial converters are typically used to communicate with old devices and machinery using RS232, and integrate them in a RS485 low voltage network. RS232 serial standard is still common for industrial appliances, but it has limited transmission range and it is vulnerable to electromagnetical noise. Electromagnetical interferences (EMI) are fairly common in industrial environments, so it is good practice not to use RS232 for serial communication to guarantee signal integrity. In case of heavy electromagnetical interferences, a section of optical fiber is recommended. Furthermore, optical fiber guarantees perfect electrical isolation in case of voltage surges or lightnings.

 

Versatility

RS232-RS485 converters are available also with isolation, with different combinations of serial standard, or with other connectors. RMT/9R converter for example is functionally identical to RST/9R, but data direction is automatically detected. IMC/9R and ISC/9R come with 3-pins Mini XLR connector and isolated RS485, in case it was necessary, with automatic data direction or RTS, respectively. Industrial serial converters DFP/9S and DFP/9A have synthetic optical fiber outputs, with screw connectors, in order to electrically isolate the appliance. Every combination of serial standard, optical fiber, and power supply, is however available, while special requests (such as higher data rates) can be made via the contact form.

Technical Specifications

Main features

Power supply

Self-powered via DB9

Power consumption

1 W

Serial transmission data rate

0 – 250 kbps (automatic) – higher data rates on request

RS232 connector

D-sub (DB9)

RS232

Communication type

Full duplex

RX input voltage

1.5 V low input threshold – 1.8 V high input threshold (± 25 V max)

TX output voltage

± 5 V (± 5.4 V max)

ESD performance RX / TX

± 15 kV (Human Body Model) – ± 8 kV IEC61000-4-2 contact discharge

RS485

Communication type

Half Duplex on a balanced line, with automatic data direction

Maximum bus voltage

± 60 V – ESD ± 16.5 kV (Human Body Model)

Common mode range

± 25 V DC

Slew rate

Limited, to have an error-free transmission

Mechanical features

Dimensions

48 mm x 31 mm x 25 mm

Working conditions

Degree of protection

IP20

Operating temperature

-20 °C to +50 °C

Storage temperature

-40 °C to +80 °C