Product catalog

PRM/1 – RS232-RS485 converter – Low voltage

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PRM/1 is an industrial converter, from RS232 serial standard to RS485, powered by a low voltage supply.

It accepts a wide range of AC and DC voltages, and it is completely Plug&Play, since it does not need any driver nor DIP switch. RS232 serial is Full Duplex, while RS485 is Half Duplex. The RS232-RS485 serial converter automatically detects data direction and transmission data rate up to 250 kbps, so it can be easily installed in any new or existing network.

Thanks to its compact 1-module DIN rail housing, it can be easily mounted in an electrical panel.

SKU: PRM/1 Category: Tags: , , ,
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Description

PRM/1 is an industrial converter, from RS232 serial standard to RS485, powered by a low voltage supply. It can be used to allow the communication of devices using two different serial standards, or to increase the transmission distance of a serial communication. Thanks to its compact 1-module DIN rail housing, it can be easily mounted in an electrical panel. It accepts a wide range of AC and DC voltages, and it is completely Plug&Play, since it does not need any driver nor DIP switch. RS232 serial is Full Duplex, while RS485 is Half Duplex. The RS232-RS485 serial converter automatically detects data direction and 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 with 400 V or 560 V isolation, powered by 230 V, or with DB9 RS232 connector. PRL/1 converter for example comes with an isolated RS485 to protect against voltage surges. IMC/9R (isolated) and RMC/9R are smaller and ideal for direct connection to a device with a DB9 connector. Industrial serial converter PRMP/1 is functionally identical to PRM/1, but it is powered by 230 V mains voltage, like PRLP/1, which in turn is isolated. Other combinations of serial standard, optical fiber, and power supply, are however available, while special requests (such as higher data rates) can be made via the contact form.

Technical Specifications

Main features

Power supply

9 – 24 V AC 48/62 Hz

9 – 30 V DC

Power consumption

1 W

Serial transmission data rate

0 – 250 kbps (automatic)

Propagation delay

600 ns (typical)

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

DIN Rail

1 module

Dimensions

90 mm x 18 mm x 57 mm

Weight

52 g

Working conditions

Degree of protection

IP20

Operating temperature

-20 °C to +50 °C

Storage temperature

-40 °C to +80 °C