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H03 - RS485 Hub 1:3 (Input Port Isolation)
H03 - RS485 Hub 1:3 (Input Port Isolation)
- Active RS485 splitter with 3kV galvanic isolation on the input side, designed to protect the Master controller.
Product Description
The Redisage H03 is a 1-to-3 RS485 Hub configured to prioritize the protection of the Master device (e.g., PLC, PC, HMI). It features 3000 VDC galvanic isolation on the Input Port, separating the control unit from the potentially hazardous field network.
It allows for the splitting of the signal into three branches while ensuring that noise or surges from any of the branches do not reach the Master. Key features:
• Split: 1 Input -> 3 Outputs (Star Topology)
• Isolation: Input Side (Master Protection)
• Power Supply: 12-30 VDC or 24 VAC
• Signal: Regenerated on all ports
• Design: DIN-rail mount, low power consumption (<1W)
Technical Documentation
Datasheet (DTR):
⬇ Download H03 Datasheet
Knowledge Base:
🔗 doc.redisage.com
Main data
Power voltage
12-30 V/DC
Galvanic isolation
Master RS485 3 kV/DC
Power connector
Screw terminal
Work temperature range
-40°C to +75°C
Safety measures
ESD 4 kV / 8 kV
Burst
Surge
RF
LED
Tx
4x Rx
Power
Serial Ports
Number of ports
4
Port type
4x RS485
Connector type
Screw terminal
Transmission speed
115200 bps
Data bits
7
8
Stop bits
1
2
Controll Bits
none
odd
even
Enclosure
Ingress Protection Code
IP20
Length
98 mm
Height
56.4 mm
Width
22.5 mm
Width in standard modules S (17.5 mm)
1.5 Module
Mounting
DIN Rail
Standards and Certifications
Declarations of Conformity
CE
RoHS
EMC
LVD
Norms
61000-6-2 - Immunity standard for industrial environments
61000-6-4 - Emission standard for industrial environments
About H03
H03 – Protecting the RS485 Master
The H03 RS485 Hub allows automation engineers to connect up to three branches of devices to a single RS485 port while ensuring the safety of the main controller. The device features 3000 VDC galvanic isolation on the Input port. This creates a safety barrier between the expensive central control system (Master) and the extensive cabling of the field devices (Slaves).
The H03 acts as a signal repeater, regenerating the data stream to ensure reliable communication over long distances (up to 1200m per branch). It is particularly useful when the field network runs through noisy environments (e.g., near large motors) or outdoors, where the risk of induced surges is high. The hub automatically detects transmission direction and requires no software setup.
Technical Specifications:- Topology: Star (1 Input to 3 Outputs).
- Isolation Type: Input Port (Master side).
- Data Rate: 300 bps to 115200 bps.
- Power: 12–30 VDC / 24 VAC.
Secure your control system with the H03. Installation guide available in the technical documentation.
3 Year Warranty
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