D-TECH RS232/485/422 Single-Mode Fiber Optic Transceiver

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Variation: DT-9077-FC port

DT-9077-FC port

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SKU: #1899 Category: Networking Goods

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DT-9077 Industrial RS232 / RS485 / RS422 Fiber Modem

3-in-1 Industrial Serial-to-Fiber Converter • Single Mode up to 20KM

Product Overview

The DT-9077 is an industrial-grade fiber modem designed to extend RS232, RS485 and RS422 serial communication over optical fiber. It provides reliable long-distance data transmission for industrial automation, SCADA, RTU, monitoring and remote communication systems.

The modem supports RS485 2-wire half-duplex and RS422 4-wire full-duplex communication. Transmission distance reaches up to 20KM over single-mode fiber and 5KM over multimode fiber.

20KM
Single Mode

460 Kbps
RS485 / RS422

3-in-1
RS232 / RS485 / RS422

Key Features

✓ RS232 / RS485 / RS422 in one device	✓ Baud rate adaptive
✓ Point-to-point fiber communication	✓ 1310 nm operating wavelength
✓ Single Mode: up to 20KM	✓ Multimode: up to 5KM
✓ RS485 2-wire half-duplex	✓ RS422 4-wire full-duplex
✓ RS232 up to 115.2 Kbps	✓ RS485 / RS422 up to 460 Kbps
✓ ±15 kV ESD protection for RS232	✓ TVS protection for RS485 / RS422
✓ LED status indicators	✓ Wide DC power input

Technical Specifications

Parameter	Specification
Model	DT-9077
Product Type	Industrial Serial-to-Fiber Modem
Serial Interfaces	RS232 / RS485 / RS422
RS485 Mode	2-Wire Half-Duplex
RS422 Mode	4-Wire Full-Duplex
RS232 Data Rate	Up to 115.2 Kbps
RS485 / RS422 Data Rate	Up to 460 Kbps
Operating Wavelength	1310 nm
Single-Mode Distance	Up to 20KM
Multimode Distance	Up to 5KM
Fiber Interface	ST Standard; SC / FC Optional
Fiber Connection	Dual Fiber; Single Fiber Optional
Electrical Connection	Screw Terminal
Input Voltage	DC 9–35 V
RS232 Protection	±15 kV ESD Protection
RS485 / RS422 Protection	TVS Diode Protection
Relative Humidity	5% – 95%

Screw Terminal Pin Assignment

Pin	Signal	RS422 Full-Duplex	RS485 Half-Duplex
1	T/R+	Send (A+)	A+
2	T/R−	Send (B−)	B−
3	RXD+	Receive (A+)	Not Used
4	RXD−	Receive (B−)	Not Used
5	TXD	RS232 Send
6	RXD	RS232 Receive
7	GND	RS232 Ground
8	VCC	DC 9–35 V
9	GND	Power Ground
10	ETH	ETH Protected Area

Optical Fiber Connection

DT-9077 Unit A – TX → Optical Fiber → RX – DT-9077 Unit B

DT-9077 Unit A – RX ← Optical Fiber ← TX – DT-9077 Unit B

Important: For the standard dual-fiber configuration, two DT-9077 units are required. Connect TX → RX and RX ← TX between the two units.

Typical Applications

SCADA Systems – Long-distance communication between controllers and remote equipment

RTU Communication – Fiber connection for remote terminal units

Industrial Automation – Factory, plant and industrial equipment communication

Serial Fiber Extension – Extend RS232 / RS485 / RS422 communication over fiber

Remote Monitoring – Data acquisition and monitoring over long distances

DT-9077 Industrial Fiber Communication
A practical solution for converting and extending RS232, RS485 and RS422 serial communication over optical fiber, especially where long distance and electrical isolation are required.