Two operator channels
One controller stores settings for two channels. The physical topology depends on the selected dispenser protocol.
Fuel dispenser channel controller
MAXSAN
Powered by embedded SARHAS software: two dispenser channels, preset by amount or volume, process monitoring and receipt printing.
Purpose
MAXSAN controller for filling station operators.
SARHAS embedded software creates preset and price commands, processes dispenser responses and displays each channel state. All metering is performed by the dispenser itself.
Learn more about the MAXSAN dispenser controller
Features
Everything a dispenser operator needs
- Two logical channels GasKitLink channels use separate lines; AZT 2.0 channels operate as a consecutive N/N+1 address pair on a shared RS-485 bus; Shelf channels use independent addresses on a shared RS-485 bus.
- Preset by amount or litres Enter the price and preset from the 4×4 hardware keypad, then start and monitor delivery.
- Operator display The 256×64 OLED shows the selected dispenser, amount, volume, price and transaction state.
- Receipts and service USB ESC/POS printer for receipts; flash drive for updates, logs and diagnostics.
Benefits
Dispenser compatibility
GasKitLink for Censtar, AZT 2.0 for ECOTEC/Topaz-compatible equipment and Shelf for Shelf and TEXNOUZ dispensers.
Updates and service
The bootloader checks the SARHAS.UPD package format, version and CRC; the application supports service logs and a receipt printer.
Supported protocols
Connectivity for Censtar, ECOTEC, Topaz, Shelf and TEXNOUZ
Each dispenser type uses verified line parameters and its own codec for commands, states and final data.
01
GasKitLink / Censtar
RS-422, 9600 bit/s, 8N1. Controls dispenser presets, prices and states.
02
AZT 2.0 / Topaz / ECOTEC
RS-485 half-duplex, 4800 bit/s, 7E2. Two channels share one bus and use a consecutive N/N+1 address pair.
03
Shelf / TEXNOUZ
RS-485 half-duplex, 19200 bit/s, 8N1. One address per nozzle; both channels use independent addresses on a shared bus. For TEXNOUZ, compatibility of a specific model depends on its automation interface and command map.
04
USB Mass Storage
Firmware updates with a SARHAS.UPD package, plus service logs and diagnostic reports.
05
USB ESC/POS
Receipt printing is implemented for the 58 mm Xprinter XP-58IIL ESC/POS printer; one USB device at a time.
Compatible equipment
Fuel dispensers
GasKitLink
Censtar
One controller operates one dispenser with two hoses or two separate dispensers with one hose each.
AZT 2.0
ECOTEC
In AZT 2.0 mode, the controller operates one dispenser with two hoses.
Shelf
Shelf + TEXNOUZ
The Shelf protocol is used with Shelf and TEXNOUZ fuel dispensers; model compatibility depends on the automation interface.
Maintenance and updates
Service through one USB Host port
SARHAS.UPD
The bootloader validates the package on a FAT/FAT32 flash drive and updates the separate application image.
Service logs
The LOG.ON file enables recording of operating events, communication errors and timeouts.
Diagnostics
A diagnostic report is saved to the USB flash drive as DIAG_<bootcount>.TXT.
Receipt printer
RECEIPT.CFG is stored in EEPROM; final receipt printing works without detailed paper or cover status monitoring.
USB hubs are not supported: connect either a flash drive or a printer at one time.
Technical specifications
MAXSAN hardware platform
Microcontroller
STM32F407VGT6, Cortex-M4F, 1 MB Flash
Dispenser channels
2 × RS-422/RS-485 with DE/RE control
Dispenser protocols
GasKitLink 9600 8N1; AZT 2.0 4800 7E2; Shelf 19200 8N1
Keys
4×4, 16 keys, factory STD / ALI layouts
Display
SSD1322 OLED 3.2", 256×64, 4 bpp, SPI1
USB
USB OTG FS Host: MSC or ESC/POS printer
Settings memory
AT24C256C, I2C2
Clock
Battery-backed RTC; LSI or 32.768 kHz LSE after service switching
Reserved interface
TTL UART, USART6, H3 connector; unused by the current firmware
Software architecture
32 KB bootloader + 864 KB application
Runtime supervision
IWDG safety supervisor and reset-cause log
Dimensions
108 × 152 × 52.9 mm
MAXSAN powered by SARHAS