The device is designed to create branches in the RS-485 interface network topology, increase the maximum allowable length of network cable lines, enhance its loading capacity, and consequently increase the number of devices in the network.
All electronic components of the Device are mounted on a single printed circuit board, the external view of which is shown in Figure 1. The Device’s board is housed in a plastic enclosure with an IP65 protection rating.
Figure 1. General view of the RPI-4 board
The Device is equipped with spring terminals for connecting a power source and three-wire RS-485 interface lines. All RS-485 interface ports are galvanically isolated from each other and have overvoltage protection. The Device allows for power supply input with any polarity. No configuration or additional calibration is required. The direction of data transmission is controlled automatically. The Device features two LEDs indicating power presence and five indicators showing data transmission through the respective channels. The layout of the terminals, indicators, and jumpers is shown in Figure 1.
| Number of Master ports | 1 unit |
|---|---|
| Number of Slave ports | 4 units |
| Master/Slave interface | RS-485 |
| Data transmission rate | 9600 baud/s |
| Solation Voltage | 1.5 kV |
| Power supply voltage | from 16 to 30 V, DC |
| Power consumption | not more than 3 W |
| Operating temperature | -40…+60 ℃ |
| Humidity | 0…95% |
| Overall dimensions, H x W x D | 118 x 110 x 90 mm |
| Weight | 0.4 kg |
| Protection rating | IP65 |
The company LLC "TEMIX" Ukraine, Nikolaev, has been engaged in the development and production of temperature control systems (thermometry systems) for bulk materials, particularly grains, for all types of grain storage facilities (concrete elevators, metal silos, and warehouses) for over 20 years.
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Limited liability engineering and production company TEMIX
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