Hirschmann OZD 485 G12-1300 PRO RS485 Fiber Optic Repeater
Product Overview
The Hirschmann OZD 485 G12-1300 PRO is a universal RS 485 fiber optic repeater designed for industrial communication networks. It converts electrical RS 485 signals to fiber optic transmission, allowing fieldbus segments to be extended over long distances with full electrical isolation and immunity to electromagnetic interference.
The PRO version of the OZD 485 G12 includes enhanced features for reliable operation, and the -1300 designation identifies the variant with 1300 nm optics for extended fiber ranges. The repeater is a key component for building line, ring and star network topologies with RS 485 based fieldbus protocols.
Key Features
- Universal RS 485 fiber optic repeater for industrial fieldbus networks
- Converts electrical RS 485 to fiber optic transmission with galvanic isolation
- Supports half duplex (2-wire) and full duplex (4-wire) RS 485 operation
- Three independent ports: one electrical and two fiber optic (BFOC connectors)
- Supports line, ring and star network topologies
- PRO version with 1300 nm optics for extended transmission distances
- Redundant power supply option for high availability networks
Technical Specifications
| Type | OZD 485 G12-1300 PRO |
|---|---|
| Electrical interface | RS 485, 2-wire or 4-wire, screw terminal connection |
| Fiber optic ports | 2, BFOC/2.5 connectors |
| Supported protocols | Modbus RTU, Modbus ASCII, BITBUS and other RS 485 fieldbus systems |
| Supply voltage | 18 to 24 V DC; 18 to 32 V DC for non-hazardous locations only; redundant inputs |
| Topologies | line, ring, star |
| Mounting | DIN rail; housing of plastic (PA 6.6) with aluminium front panel |
| Order No. | 943 895-321 |
| Optical wavelength | 1310 nm |
| Data rate | 0 to 1.5 Mbit/s NRZ |
| Transmission distance | Up to 22 km on single-mode 9/125 um (13 dB budget); up to 16 km on multimode 50/125 um or 62.5/125 um (18 dB budget) |
| Receiver sensitivity | -31 dBm |
| Ambient temperature | -25 °C to +70 °C (storage -25 °C to +80 °C) |
| Protection class | IP 20 |
| Approvals | cUL 508; ISA 12.12.01 Class 1 Div. 2; ATEX Zone 2 |
Applications
The OZD 485 G12-1300 PRO is used in industrial automation, process control and utility networks where RS 485 fieldbus devices such as PLCs, drives, meters and instruments must communicate reliably over long distances or in electrically noisy environments. Fiber optic transmission provides immunity to EMI and surge events common in industrial plants.
Ordering and Selection
When selecting the repeater, confirm the electrical interface, fibre type and data rate of your RS-485 network, because the repeater is configured for a specific bus architecture. The repeater connects RS-485 devices over fibre optic links, and the selected the repeater configuration must match the network topology and cable lengths at your site. Our team can help you confirm that the Hirschmann OZD 485 G12-1300 PRO you select is correct for your serial network, and
Maintenance and Support
The Hirschmann OZD 485 G12-1300 PRO is designed for reliable operation in industrial environments, and fibre connections should be inspected periodically. Genuine spares and accessories, including power supply units and fibre patch cords, are available through Seven Star LLC. Contact our team and we will confirm availability and lead time for your project.
Industry Applications and Custom Support
The Hirschmann OZD 485 G12-1300 PRO repeater is trusted by operations and maintenance teams across industrial networks in Oman, the GCC and the wider Middle East region. Our customers select the OZD 485 G12 repeater for reliability, genuine quality and dependable supply. Seven Star LLC provides custom support including technical selection, quotation and after-sales assistance, and we regularly supply this repeater as part of preventive maintenance programs and shutdown packages. Whether you need a single unit or a complete set for a project, our team supports procurement and inspection.
The OZD 485 G12-1300 PRO repeater converts the RS485 signal to the fibre optic link, and the repeater extends the fieldbus distance with the galvanic isolation between the segments.
The Hirschmann OZD 485 G12-1300 PRO converter connects RS 485 fieldbus segments such as Modbus RTU, Modbus ASCII and BITBUS.
Configuration Switches and Signal Contact
Supported Bus Systems and Limits
Why Seven Star LLC?
Seven Star LLC supplies genuine Hirschmann and Belden communication equipment to industrial customers in Oman and the GCC We verify part numbers, provide documentation support and for network infrastructure projects.
Seven Star LLC maintains a regional inventory in Muscat and coordinates directly with manufacturers across Europe and Asia. Our engineers help you verify the exact model and revision before ordering, avoiding costly mismatches.
Request a Quote for Hirschmann OZD 485 G12-1300 PRO RS485 Fiber Optic Repeater
For the Hirschmann OZD 485 G12-1300 PRO or any related control and instrumentation requirement, contact the Seven Star LLC team. Submit a formal inquiry through our RFQ page with your configuration and application details, and our specialists will respond with a detailed commercial proposal and the official Hirschmann documentation.
Planning a Fibre Optic RS-485 Link
Before installing the repeaters, work through the link budget and network layout rather than relying on the maximum distance alone:
- Confirm the fibre type installed or planned between the two ends, and that it suits the 1300 nm optics of this variant.
- Account for losses from splices, patch panels and connectors in addition to cable length, and leave a margin for ageing and future repairs.
- Check that the data rate and bus settings of the connected devices are supported by the repeater and set consistently across the segment.
- Decide on line, star or redundant ring topology according to how critical the link is and how the fibre routes are laid out.
Installation and Commissioning
Mount the repeater on a DIN rail in a panel with adequate ventilation and a clean, stable 24 V DC supply, using the redundant supply input where availability matters. On the electrical side, keep RS-485 stubs short, observe correct polarity, and terminate the bus at its physical ends only. On the optical side, keep dust caps fitted until the moment of connection, clean the connector end faces, and make sure the transmit of one repeater goes to the receive of the next. After power-up, use the status LEDs to confirm that each optical port is receiving, then test communication with the connected devices under normal traffic before handing over.
Troubleshooting Tips
- No optical link: check for crossed fibres, dirty connectors or a damaged patch cord before suspecting the repeater.
- Intermittent errors: review the optical budget, bend radius of the fibre and bus termination on the copper side.
- Communication works only in one direction: confirm 2-wire or 4-wire settings match the connected RS-485 devices.
Typical Uses in Oman and the GCC
Fibre repeaters are commonly used to connect RS-485 devices between substations and control rooms, along pipeline and tank farm areas, and within desalination, water and power plants, where long cable runs and high-energy equipment make copper links vulnerable to interference and lightning surges.
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- Datasheet Hirschmann OZD 485 G12-1300 PRO RS485 Fiber Optic Repeater Datasheet Download
Hirschmann switch families listed here
Four managed switch lines appear on this page. The RS20 and RS30 are compact OpenRail switches, shown here as the RS20-1600T1T1 with 16 Fast Ethernet ports and an RS30, the version with two Gigabit ports. The RSP20 belongs to the RSP rail switches, which were introduced with PRP and HSR redundancy for networks that need high availability. The BRS20 belongs to the newer BOBCAT family. The OZD 485 G12-1300 PRO is a repeater that carries RS-485 signals over fiber in line, star or ring layouts. The 154/06 crane boom cable reel assembly is a different kind of product and is not network equipment.Where Hirschmann equipment is used
Hirschmann industrial switches connect PLCs, drives, protection relays and HMIs in power distribution, oil and gas facilities, water plants, transport systems and factories. Searches such as managed industrial networking and harsh environment network solutions describe the same need: Ethernet that tolerates heat, vibration and electrical noise, with redundancy functions. Many GCC plants standardized on these switches years ago and now need matching units.Ordering Hirschmann parts: what we need
Hirschmann product codes are long because every position defines hardware. BRS20-12009999, for instance, fixes the port count and types, and further characters set temperature range, supply voltage, approvals and software level. Send the complete code and the order number from the label, plus the firmware version if the unit must join an existing ring. For SFP modules give fiber type and distance. For the cable reel send the crane make, model and the reel part number.Browse Hirschmann (Belden) products by category: Industrial Communications, Material Handling & Lifting Equipment.
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