Wireless interface converter for petrol stations


Various wired interfaces are often applied for communication exchange between electronic devices at petrol station: RS-232, RS-485, RS-422, current loop, others. These interfaces have many benefits, but all of them have a common disadvantage – they are wired, so require putting of cabling for connection. As a rule wires are put in underground pipes, which requires excavation (removing the top layer of asphalt or other cover, digging of trenches, laying of cables, etc.).

Wireless communication is an alternative to wired connection, it simplifies the whole process and eliminates a necessity of placing cabling – electronic devices are able to communicate, but communication is done over-the-air instead of wired cabling. RFC converter serves for establishing of wireless communication between the devices and have advantages as quick of mounting, flexibility of settings, high noise immunity and others.

Wireless interface converter RFC for petrol stations is appointed for establishing of wireless communication between devices having interfaces RS-232 and RS-485. RFC converter does not bring any changes to exchanged data between devices, thus RFC converter is a complete analogue to wired cabling connection with the only exception of 35 ms delay at start of data transmission. Data is encrypted during transmission using keys (changing at each data packet transfer), which set the final user can program in the RFC converters at configuration.

RFC interface converter board:

RS-485/RS-232 dispenser interface converter RS-485 / RS-232
RS-485/RS-232 dispenser interface converter RS-485 / RS-232
Click on image to enlarge

RFC interface converter in mounting box:

RS-485/RS-232 interface converter
RS-485 / RS-232 pump interface converter RS-485/RS-232 interface converter Connect to RS-232 dispenser
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Application of RFC converter allows to minimize wires placing on petrol station and fasten installation:

RS-485/RS-232 dispenser interface converter
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Nominal power supply voltage 12 V DC
Power supply voltage range 9 … 18 V DC
Wired interfaces RS-232/RS-485
Temperature range from -20°C to +60°C
Weight 45 g
Overall dimensions 85 x 58 x 25 mm

Wireless communication parameters:

Transmission frequency 433 MHz
Modulation type GFSK
Output power not more than 10 mW
Baud rate 10000 bits/sec
Delay at transmission 35 ms
Encryption at transmission RTEA using user-configurable encryption table

Wired communication parameters:

Communication protocol any
Baud rate 1200 … 115200
Data format - 5 … 8 data bits
- 1 stop bit
- odd/even/none parity control
Data length up to 270 bytes
Sign of data end delay of more than 3.5 bytes


RS-485/RS-232 dispenser interface converter
Click on image to enlarge


RS-485/RS-232 dispenser interface converter   RFC interface converter PCB board with terminal blocks
Order code: RFC-PCB-001
RS-485/RS-232 interface converter   RFC interface converter board in mounting box
Order code: RFC-BOX-001
RS-485/RS-232 interface converter   RFC interface converter board in mounting box together with PTS controller over fuel dispensers and ATG systems
Order code: RFC-PTS-001


1. What is the radio frequency used in wireless communication device and is it allowed to be used on the petrol station?

WCD is designed to transmit / receive data via radio channel at a speed of up to 9600 bit / s in the frequency range (2410-2465) MHz with the transmitter output power up to 10 mW. Due to such a small output power it is allowed to use WCD without certification (2.4 MHz is a free from licensing radio frequency)

2. Where is the WCD installed and does it require ATEX approval?

WCD is to be installed in an explosion safe area (for example inside the dispenser box), since than it does not need ATEX approval.

3. What interfaces does WCD allow to prolong wireless?

These are RS-232 and RS-485 (2 wires) interfaces.

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"Wireless interface converter for petrol stations"

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