Overview
Model 4044 6-Channel Fiber Optic to RS422/RS232 Converter (Unidirectional, High-Speed)
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Copper Serial Input channels: 2-Channels RS422 Differential / 4-Channels RS232
INTRODUCTION:
The Model 4044 6-Channel Fiber Receiver / Unidirectional Interface Converter is a high-performance solution for converting fiber optic signals into copper serial communications with complete electrical isolation. Engineered for reliability in demanding environments, it enables secure, high-speed data transmission across long distances without signal degradation or interference.
Designed to support both RS422 and RS232 protocols, the Model 4044 provides six independent communication channels—making it ideal for multi-device connectivity in industrial, military, and data acquisition applications. With fiber-based transmission, the unit eliminates ground loops and protects connected equipment from electrical noise and transient surges.
Operating at speeds up to 10 Mbps (RS422) and 115.2 Kbps (RS232), this converter ensures fast, stable communication while maintaining signal integrity over extended distances. Its rugged design, wide operating temperature range, and built-in protection features make it well-suited for harsh environments where dependable performance is critical.
FEATURES:
- Model 4044 converts ST Duplex Fiber to Copper; 2-Channels; two channels (CH1, CH2) RS422 over a single 9-pin microD port (J2); 4-channels (J7, J8, J9) & 1-channel (J10) RS422 over a single 15-pin microD port (J3).
- Supports constructing an optically isolated high speed communication link between connected devices.
- Typical operating speeds are up to 10 Mbps for RS422 to fiber conversion, and 115.2 Kbps for RS232.
How It Works
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Fiber Input Signal
Data is transmitted from a remote device over a fiber optic cable and enters the Model 4044 through its optical input ports.
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Signal Conversion
The unit converts the incoming fiber optic signals into standard electrical serial data.
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Serial Output (RS422 / RS232)
The converted data is then sent out through the corresponding copper ports as RS422 or RS232 signals, ready for use by connected equipment.
SPECIFICATIONS:
Optical Interface:
- TX Power: 12 dBm
- RX Sensitivity: -27.5 dBm
- Wavelength: 850 nm, multimode
- Fiber Size: Accepts 50/125 µm, 62.5/125 µm, or 100/140 µm
Fiber Polarity:
- Logical 0 = Light ON/OFF: User Selectable via Jumper
- Logical 1 = Light ON/OFF: User Selectable via Jumper
Copper Interface:
- 2 Channels RS422
- 4 Channels RS232
- Bit Rate (nom.):
- RS422: up to10 Mbps
- RS232: up to 115.2 Kbps
Operating Environment:
Copper Connectors:
- Copper I/O: RS422, 9-CNT J2 MicroD, Pin Connector: (M83513/03-A09N)
- Copper I/O: RS232/RS422, 15 CNT J3 MicroD, Pin Connector: (M83513/03-B09N)
Glass Fiber Connectors:
- Fiber optic ports Connectors ports (J7, J8, J9), 115.2 Kbps
supporting RS232 over Fiber for speeds up to 115.2 Kbps.
- Fiber optic connectors ports (J4, J6, J10), are high speed supporting
10 Mbps RS422 over Fiber.
Power Connector:
- Supply Voltage: (9.9 - 35) VDC
- 9-Socket- J1; M83513/04-A09N
Mechanical:
- Size: 5” x 4.71” x 2.83” [127mm x 119.6mm x 71.9mm]
- Weight: 0.921 Lbs. [0.421kg]
Ground Relationship / Configuration:
- RS232: Signal GND tied to digital GND, both isolated from Chassis GND.
RS422 Channels: 1000 Ohm impedance between Signal GND and
and Digital GND, both isolated from Chassis GND
APPLICATION:
The converter provides an industrial solution for applications requiring a single point-to-point or a communication link over short and long distances. Application include: PC-to-PC long distance communications, factory automation, data collection devices, barcode readers, time clocks, scales, data entry terminals, ATM’s and serial communications in harsh environments.
The Model 4044 is designed to operate from -40°C to 85°C. The unit features ESD protection circuitry on the copper interfaces. The power input is protected from transients, as well as, over voltage and over current. The converter is designed to operate from 9.9 VDC to 35 VDC, via the 9-pin microD connector.

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All data switches, data communication products, and data acquisition products are subject to a one year warranty against manufacturing defects. The limit of ESL liability is limited to the cost of the ESL product provided.
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