Magio Mini RS485 bus adapter
Two RS485 buses for automation Modbus RTU connections
Magio Mini RS485 is a compact DIN rail mounted bus adapter for building automation and light industrial use. The card has two RS485 buses, and the bus settings are selected in software according to site requirements.
Use case
RS485 bus connection for building automation
The adapter is intended for situations where the automation system needs a reliable RS485 connection, for example for Modbus RTU devices. The solution fits Bithouse automation and device systems as well as customer-specific implementations.
- 2 RS485 buses per card
- Typically used with Modbus RTU
- Software-selectable bus settings
- For building automation and light industrial environments
Key Features
A compact bus adapter for clear field connectivity
Magio Mini RS485 is designed as a practical bus connection where installation, cabling and diagnostics are straightforward.
Two buses
The card has two RS485 buses. Serial ports can be named, for example, as Modbus 1 and Modbus 2 buses.
Bus settings from software
Master/slave mode, speed, parity, bit count and stop bits are selected in software.
LED diagnostics
RX and TX LEDs indicate data moving on the bus and packets sent from the card.
Connectors and cabling
Clear connections for buses, ground and termination
Connections are arranged by bus, and the card has markings for receive, transmit, biasing and termination. The A-/B+ terminals tolerate a wiring error to 24 V DC.
1A-, 1B+
RS485 bus 1.
2A-, 2B+
RS485 bus 2.
1C, 2C
Ground, GND / 0 V DC, through a 100 ohm resistor.
RX1 / RX2 and TX1 / TX2
LEDs for data moving on the bus and packets sent from the card.
BIAS+ / BIAS-
Manually selectable bias resistors.
TERM
For bus termination.
Technical Data
Magio Mini RS485 bus adapter
The data is based on the Magio Mini RS485 data sheet dated 2026-06-04.
| Feature | Value |
|---|---|
| Buses | 2 RS485 buses per card. |
| Typical protocol | Modbus RTU. |
| Bus settings | Master/slave, 1200-115200 bps, parity N/E/O, 8 bits and 1-2 stop bits. Typically 19200 8E1. |
| Wiring error tolerance | A-/B+ terminals tolerate a wiring error to 24 V DC. |
| Galvanic isolation | Not galvanically isolated. |
| Operating environment | 0-50 °C, humidity below 95%, non-condensing. |
| Cable and tightening torque | Maximum 1.5 mm², tightening torque 0.2 Nm. Recommended cable is twisted pair, for example CAT 6. |
| Power consumption | 24 V DC design current 30 mA. |
| Mounting | 35 mm DIN rail. |
| Dimensions and weight | Width 36.3 mm (2 DIN modules), height 90.5 mm, depth 62.0 mm, weight 75 g. |
| Package contents | USB 3.0 USB-C to USB-A cable, 90°, 1 m, black. |
| Card versions | In the first production batch, BIAS and TERM connections on the RS485-2 bus differ from later batches. A separate marking is shown on the module enclosure. |
Do you need an RS485 bus connection for an automation system?
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