TWDXCAISO

Configured for RS485 serial link isolation and line termination in Twido controller networks, the Schneider Electric TWDXCAISO (TWDXCAISO tap isolation box) provides electrical connection through two RJ45 connectors and one screw terminal block. It operates from an external 24 VDC supply and supports pre-polarized RS485 lines, line isolation, and line-end adaptation.

Hardware Specifications

Parameter	Specification
Model	TWDXCAISO
Brand	Schneider Electric
Product Range	Twido
Product Type	RS485 Tap Isolation Box
Origin	Indonesia (ID)
Weight	0.1 kg
Dimensions	66 x 65 x 120 mm
Rated Supply Voltage	24 VDC
Supply Type	External DC supply
Electrical Connections	1 screw terminal block, 2 RJ45 connectors
Serial Link	RS485
Supported Applications	Pre-polarized lines (2 x 620 Ohm), RS485 line isolation, line-end adapter (RC 120 Ohm, 1 nF)
Mounting	35 mm symmetrical DIN rail
Compatible Controllers	Twido programmable controllers, Modicon M238 logic controllers
Accessory Category	Connection accessories
GTIN	3595863895360

RS485 Line Isolation and Termination

The TWDXCAISO provides a connection point for RS485 serial link wiring and supports electrical isolation of the serial line. Its specified applications include pre-polarized lines using two 620 Ohm resistors and line-end adaptation using an RC network rated at 120 Ohm and 1 nF.

The external 24 VDC supply powers the isolation box. Two RJ45 connectors and one screw terminal block provide the specified electrical connection interfaces. The component is intended for Twido serial communication accessories and is also listed as compatible with Modicon M238 logic controllers.

Frequently Asked Questions (FAQ)

Q: Which communication interface does the TWDXCAISO support?

A: It is designed for RS485 serial links and provides two RJ45 connectors and one screw terminal block.

Q: What external supply voltage does the isolation box require?

A: The specified rated supply voltage is 24 VDC. The product uses an external DC supply.

Q: Which RS485 termination arrangements are supported?

A: The listed applications include pre-polarization using two 620 Ohm resistors and line-end adaptation using an RC network of 120 Ohm and 1 nF.

Field Installation Guidelines

• Mount the unit on a compatible 35 mm symmetrical DIN rail and secure it according to the installation instructions.
• Verify the external supply polarity and confirm that the supply provides 24 VDC before energizing the unit.
• Connect the RS485 conductors according to the controller and accessory wiring diagrams. Maintain consistent signal polarity throughout the communication line.
• Apply line polarization and termination only where required by the network topology. Avoid unintended additional termination points.
• Route RS485 communication wiring separately from high-voltage and high-current conductors where practicable to reduce electromagnetic interference.
• Follow the manufacturer's instructions for cable shielding and shield grounding. Avoid creating unintended ground loops.
• Confirm the controller compatibility, wiring continuity, and communication operation before returning the system to service.

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