RS485 communication module
RS485 communication module
This module allows the RTU to communicate via RS485 link with one or several devices connected to equipotential Grounds, as is often
the case within a single building.
A ‘bus’ network topology is required: no looping or star structure configurations.
Any diversions from the main bus must be kept as short as possible (< 10 m).
The communication speed on the link is configurable: From 1200 to 115,220 bits per second.
: power supply for Sofrel devices
•
: 0V or GND
• D+: RS485 bus potential (+)
: RS485 bus potential (-)
Connecting ⊕ is only useful for supplying power to the RDRTU-2 Radio link modem.
Example of interconnection of several remote terminal units:
Technical specifications
- Cable:
- Use a twisted pair from a wire with screen or shielding.
- Pay attention to polarity.
- Connect the cable shielding to the Ground on one side only.
- Maximum length = 1200 metres (for greater lengths, use repeaters).
RTU RTU
RS485 bus
Remote terminal
unit
(
)
: Only available in countries where 869MHz frequency is allowed, check with country’s regulations.
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