Industrial Multi-Channel RS232/422/485 Fiber Converter 2Km–20Km

Industrial Multi-Channel RS232/422/485 Fiber Converter 2Km–20Km

Overview

The LNK-IRS Series delivers high-performance multi-channel serial-to-fiber conversion designed for

mission-critical industrial environments. Supporting up to 16 serial ports with flexible combinations of

RS232, RS485, and RS422, it provides secure and interference-free data transmission over fiber links

up to 20Km. With rugged aluminum housing, wide temperature tolerance, and fanless DIN-rail design,

it ensures long-term stability in automation, traffic, and stage lighting control systems.

Features

• Flexible Port Options: Supports 4–16 RS232, 4–16 RS485, or 2–8 RS422 channels.

• Configurable Mix: Custom combinations such as 8 RS232 + 8 RS485 or mixed RS232/RS422.

• Reliable Fiber Extension: MMF up to 2Km, SMF up to 20Km with SC/ST/FC/SFP connectors.

• Industrial Build: IP40 aluminum case, fanless cooling, DIN-rail mounting.

• Rugged Protection: Reverse polarity, 15KV ESD, and surge immunity.

• Wide Temp Range: Operates reliably from -40°C to +80°C.

• Visual Monitoring: Power, fiber link, and channel activity LED indicators.

• Long Service Life: MTBF over 216,000 hours, backed by 5-year warranty.

Technical Indexes

 

Fiber Optical Interface
Fiber interface	SFP, FC, SC or ST
Cable requirement	Multi-Mode: 50/125um, 62.5/125um Single-Mode: 9/125um
Fiber port	1 Fiber Port
Transmission distance	Multi-Mode: 2km Single-Mode: 20km
Wavelength	1310nm/1490nm/1550nm
RS232 Serial Interface
Physical interface	Industrial standard screw terminal
Data type	Up to 16Ch RS232 Bi-Direction
RS-232 signals	TxD, RxD, GND
Serial port line distance (copper)	15 meters
Baud Rate	0 ~ 800kbps
RS422 Serial Interface
Physical interface	Industrial standard screw terminal
Data type	Up to 8Ch RS422 Bi-Direction
RS-422 signals	Tx+, Tx-, Rx+, Rx-, GND
Serial port line distance (copper)	1000 meters
Baud Rate	0 ~ 800kbps
RS485 Serial Interface
Physical interface	Industrial standard screw terminal
Data type	Up to 16Ch RS485 Bi-Direction
RS-485 signals	Data+, Data-, GND
Serial port line distance (copper)	1000 meters
Baud rate	0 ~ 800kbps
Power Requirements
Power input	12~48VDC
Power consumption	<6W
Power connector	Terminal block
Power protection	Reverse polarity protection
LED Indicator
PWR	Power Supply
FL	Fiber Link Status
Data 1~16	Serial Data Signal
Mechanical
Dimensions (LxWxH)	119 x 114 x 50mm
Weight	0.55KG
Casing	Aluminum Case
Mounting Options	DIN-Rail Mount
Environmental
Working Temperature	-40°C to 80°C (-40°F to 176°F)
Storage Temperature	-40°C to 85°C (-40°F to 185°F)
Working Humidity	5%~95% (Non-Condensing)
MTBF	216,388 Hours
Regulatory Approvals
EMI	FCC Part15, CISPR (EN55022) Class A
EMS	EN61000-4-2 (ESD) Level 4, Criteria B EN61000-4-3 (RS) Level 3, Criteria A EN61000-4-4 (EFT) Level 3, Criteria A EN61000-4-5 (Surge) Level 3, Criteria B EN61000-4-6 (CS) Level 3, Criteria A
Shock / Freefall / Vibration	Shock: MIL-STD-810F Method 516.5 Free Fall: MIL-STD-810F Method 516.5 Vibration: MIL-STD-810F Method 514.5 C-1 & C-2
Green	RoHS Compliant
Certifications:	FCC, CE

Ordering Information

Industrial 4Ch RS232/485 or 2Ch RS422 Serial to Fiber Converter

 

Model	Description
LNK-IRS232-C04-SFP	Industrial 4Ch RS-232 Serial to Fiber Converter, SFP Port (not including SFP modules), -40°C ~ 80°C
LNK-IRS232-C04	Industrial 4Ch RS-232 Serial to Fiber Converter, Multi-Mode, 1310nm, Dual Fiber, 2KM, SC, -40°C ~ 80°C
LNK-IRS232-C04-20	Industrial 4Ch RS-232 Serial to Fiber Converter, Single-Mode, 1310nm, Dual Fiber, 20KM, SC, -40°C ~ 80°C
LNK-IRS232-C04-S20A	Industrial 4Ch RS-232 Serial to Fiber Converter, Single-Mode, Single Fiber, 1310nm Tx/1550nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS232-C04-S20B	Industrial 4Ch RS-232 Serial to Fiber Converter, Single-Mode, Single Fiber, 1550nm Tx/1310nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS485-C04-SFP	Industrial 4Ch RS-485 Serial to Fiber Converter, SFP Port (not including SFP modules), -40°C ~ 80°C
LNK-IRS485-C04	Industrial 4Ch RS-485 Serial to Fiber Converter, Multi-Mode, 1310nm, Dual Fiber, 2KM, SC, -40°C ~ 80°C
LNK-IRS485-C04-20	Industrial 4Ch RS-485 Serial to Fiber Converter, Single-Mode, 1310nm, Dual Fiber, 20KM, SC, -40°C ~ 80°C
LNK-IRS485-C04-S20A	Industrial 4Ch RS-485 Serial to Fiber Converter, Single-Mode, Single Fiber, 1310nm Tx/1550nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS485-C04-S20B	Industrial 4Ch RS-485 Serial to Fiber Converter, Single-Mode, Single Fiber, 1550nm Tx/1310nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS422-C02-SFP	Industrial 2Ch RS-422 Serial to Fiber Converter, SFP Port (not including SFP modules), -40°C ~ 80°C
LNK-IRS422-C02	Industrial 2Ch RS-422 Serial to Fiber Converter, Multi-Mode, 1310nm, Dual Fiber, 2KM, SC, -40°C ~ 80°C
LNK-IRS422-C02-20	Industrial 2Ch RS-422 Serial to Fiber Converter, Single-Mode, 1310nm, Dual Fiber, 20KM, SC, -40°C ~ 80°C
LNK-IRS422-C02-S20A	Industrial 2Ch RS-422 Serial to Fiber Converter, Single-Mode, Single Fiber, 1310nm Tx/1550nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS422-C02-S20B	Industrial 2Ch RS-422 Serial to Fiber Converter, Single-Mode, Single Fiber, 1550nm Tx/1310nm RX, 20KM, SC, -40°C ~ 80°C
Mounting Options	► Default DIN-Rail Bracket installed
Power Options	► DIN-Rail Power Supply. Open Wire for Terminal Block
	► Power Supply needs to be purchased separately

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Notes:

1. FC, ST fiber port can be customized;

2. Can be configured with mixed signals, such as 2Ch RS232 + 2Ch RS485, 2Ch RS232 + 1Ch RS422,

2Ch RS485 + 1Ch RS422, etc

Industrial 8Ch RS232/485 or 4Ch RS422 Serial to Fiber Converter

Model	Description
LNK-IRS232-C08-SFP	Industrial 8Ch RS-232 Serial to Fiber Converter, SFP Port (not including SFP modules), -40°C ~ 80°C
LNK-IRS232-C08	Industrial 8Ch RS-232 Serial to Fiber Converter, Multi-Mode, 1310nm, Dual Fiber, 2KM, SC, -40°C ~ 80°C
LNK-IRS232-C08-20	Industrial 8Ch RS-232 Serial to Fiber Converter, Single-Mode, 1310nm, Dual Fiber, 20KM, SC, -40°C ~ 80°C
LNK-IRS232-C08-S20A	Industrial 8Ch RS-232 Serial to Fiber Converter, Single-Mode, Single Fiber, 1310nm Tx/1550nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS232-C08-S20B	Industrial 8Ch RS-232 Serial to Fiber Converter, Single-Mode, Single Fiber, 1550nm Tx/1310nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS485-C08-SFP	Industrial 8Ch RS-485 Serial to Fiber Converter, SFP Port (not including SFP modules), -40°C ~ 80°C
LNK-IRS485-C08	Industrial 8Ch RS-485 Serial to Fiber Converter, Multi-Mode, 1310nm, Dual Fiber, 2KM, SC, -40°C ~ 80°C
LNK-IRS485-C08-20	Industrial 8Ch RS-485 Serial to Fiber Converter, Single-Mode, 1310nm, Dual Fiber, 20KM, SC, -40°C ~ 80°C
LNK-IRS485-C08-S20A	Industrial 8Ch RS-485 Serial to Fiber Converter, Single-Mode, Single Fiber, 1310nm Tx/1550nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS485-C08-S20B	Industrial 8Ch RS-485 Serial to Fiber Converter, Single-Mode, Single Fiber, 1550nm Tx/1310nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS422-C04-SFP	Industrial 4Ch RS-422 Serial to Fiber Converter, SFP Port (not including SFP modules), -40°C ~ 80°C
LNK-IRS422-C04	Industrial 4Ch RS-422 Serial to Fiber Converter, Multi-Mode, 1310nm, Dual Fiber, 2KM, SC, -40°C ~ 80°C
LNK-IRS422-C04-20	Industrial 4Ch RS-422 Serial to Fiber Converter, Single-Mode, 1310nm, Dual Fiber, 20KM, SC, -40°C ~ 80°C
LNK-IRS422-C04-S20A	Industrial 4Ch RS-422 Serial to Fiber Converter, Single-Mode, Single Fiber, 1310nm Tx/1550nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS422-C04-S20B	Industrial 4Ch RS-422 Serial to Fiber Converter, Single-Mode, Single Fiber, 1550nm Tx/1310nm RX, 20KM, SC, -40°C ~ 80°C
Mounting Options	► Default DIN-Rail Bracket installed
Power Options	► DIN-Rail Power Supply. Open Wire for Terminal Block
	► Power Supply needs to be purchased separately

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Notes:

1. FC, ST fiber port can be customized;

2. Can be configured with mixed signals, such as 4Ch RS232 + 4Ch RS485, 4Ch RS232 + 2Ch RS422,

4Ch RS485 + 2Ch RS422, etc

Industrial 12Ch RS232/485 or 6Ch RS422 Serial to Fiber Converter

 

Model	Description
LNK-IRS232-C12-SFP	Industrial 12Ch RS-232 Serial to Fiber Converter, SFP Port (not including SFP modules), -40°C ~ 80°C
LNK-IRS232-C12	Industrial 12Ch RS-232 Serial to Fiber Converter, Multi-Mode, 1310nm, Dual Fiber, 2KM, SC, -40°C ~ 80°C
LNK-IRS232-C12-20	Industrial 12Ch RS-232 Serial to Fiber Converter, Single-Mode, 1310nm, Dual Fiber, 20KM, SC, -40°C ~ 80°C
LNK-IRS232-C12-S20A	Industrial 12Ch RS-232 Serial to Fiber Converter, Single-Mode, Single Fiber, 1310nm Tx/1550nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS232-C12-S20B	Industrial 12Ch RS-232 Serial to Fiber Converter, Single-Mode, Single Fiber, 1550nm Tx/1310nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS485-C12-SFP	Industrial 12Ch RS-485 Serial to Fiber Converter, SFP Port (not including SFP modules), -40°C ~ 80°C
LNK-IRS485-C12	Industrial 12Ch RS-485 Serial to Fiber Converter, Multi-Mode, 1310nm, Dual Fiber, 2KM, SC, -40°C ~ 80°C
LNK-IRS485-C12-20	Industrial 12Ch RS-485 Serial to Fiber Converter, Single-Mode, 1310nm, Dual Fiber, 20KM, SC, -40°C ~ 80°C
LNK-IRS485-C12-S20A	Industrial 12Ch RS-485 Serial to Fiber Converter, Single-Mode, Single Fiber, 1310nm Tx/1550nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS485-C12-S20B	Industrial 12Ch RS-485 Serial to Fiber Converter, Single-Mode, Single Fiber, 1550nm Tx/1310nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS422-C06-SFP	Industrial 6Ch RS-422 Serial to Fiber Converter, SFP Port (not including SFP modules), -40°C ~ 80°C
LNK-IRS422-C06	Industrial 6Ch RS-422 Serial to Fiber Converter, Multi-Mode, 1310nm, Dual Fiber, 2KM, SC, -40°C ~ 80°C
LNK-IRS422-C06-20	Industrial 6Ch RS-422 Serial to Fiber Converter, Single-Mode, 1310nm, Dual Fiber, 20KM, SC, -40°C ~ 80°C
LNK-IRS422-C06-S20A	Industrial 6Ch RS-422 Serial to Fiber Converter, Single-Mode, Single Fiber, 1310nm Tx/1550nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS422-C06-S20B	Industrial 6Ch RS-422 Serial to Fiber Converter, Single-Mode, Single Fiber, 1550nm Tx/1310nm RX, 20KM, SC, -40°C ~ 80°C
Mounting Options	► Default DIN-Rail Bracket installed
Power Options	► DIN-Rail Power Supply. Open Wire for Terminal Block
	► Power Supply needs to be purchased separately

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Notes:

1. FC, ST fiber port can be customized;

2. Can be configured with mixed signals, such as 6Ch RS232 + 6Ch RS485, 6Ch RS232 + 3Ch RS422,

6Ch RS485 + 3Ch RS422, etc

Industrial 16Ch RS232/485 or 8Ch RS422 Serial to Fiber Converter

 

Model	Description
LNK-IRS232-C16-SFP	Industrial 16Ch RS-232 Serial to Fiber Converter, SFP Port (not including SFP modules), -40°C ~ 80°C
LNK-IRS232-C16	Industrial 16Ch RS-232 Serial to Fiber Converter, Multi-Mode, 1310nm, Dual Fiber, 2KM, SC, -40°C ~ 80°C
LNK-IRS232-C16-20	Industrial 16Ch RS-232 Serial to Fiber Converter, Single-Mode, 1310nm, Dual Fiber, 20KM, SC, -40°C ~ 80°C
LNK-IRS232-C16-S20A	Industrial 16Ch RS-232 Serial to Fiber Converter, Single-Mode, Single Fiber, 1310nm Tx/1550nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS232-C16-S20B	Industrial 16Ch RS-232 Serial to Fiber Converter, Single-Mode, Single Fiber, 1550nm Tx/1310nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS485-C16-SFP	Industrial 16Ch RS-485 Serial to Fiber Converter, SFP Port (not including SFP modules), -40°C ~ 80°C
LNK-IRS485-C16	Industrial 16Ch RS-485 Serial to Fiber Converter, Multi-Mode, 1310nm, Dual Fiber, 2KM, SC, -40°C ~ 80°C
LNK-IRS485-C16-20	Industrial 16Ch RS-485 Serial to Fiber Converter, Single-Mode, 1310nm, Dual Fiber, 20KM, SC, -40°C ~ 80°C
LNK-IRS485-C16-S20A	Industrial 16Ch RS-485 Serial to Fiber Converter, Single-Mode, Single Fiber, 1310nm Tx/1550nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS485-C16-S20B	Industrial 16Ch RS-485 Serial to Fiber Converter, Single-Mode, Single Fiber, 1550nm Tx/1310nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS422-C08-SFP	Industrial 8Ch RS-422 Serial to Fiber Converter, SFP Port (not including SFP modules), -40°C ~ 80°C
LNK-IRS422-C08	Industrial 8Ch RS-422 Serial to Fiber Converter, Multi-Mode, 1310nm, Dual Fiber, 2KM, SC, -40°C ~ 80°C
LNK-IRS422-C08-20	Industrial 8Ch RS-422 Serial to Fiber Converter, Single-Mode, 1310nm, Dual Fiber, 20KM, SC, -40°C ~ 80°C
LNK-IRS422-C08-S20A	Industrial 8Ch RS-422 Serial to Fiber Converter, Single-Mode, Single Fiber, 1310nm Tx/1550nm RX, 20KM, SC, -40°C ~ 80°C
LNK-IRS422-C08-S20B	Industrial 8Ch RS-422 Serial to Fiber Converter, Single-Mode, Single Fiber, 1550nm Tx/1310nm RX, 20KM, SC, -40°C ~ 80°C
Mounting Options	► Default DIN-Rail Bracket installed
Power Options	► DIN-Rail Power Supply. Open Wire for Terminal Block
	► Power Supply needs to be purchased separately

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Notes:

1. FC, ST fiber port can be customized;

2. Can be configured with mixed signals, such as 8Ch RS232 + 8Ch RS485, 8Ch RS232 + 4Ch RS422,

8Ch RS485 + 4Ch RS422, etc

Data Channel Rate Table

 

Data Channel	Measured error-free baud rate (bps)	Maximum supported baud rate (Kbps)	Typical application
1	460800	800	Stage lighting control system DMX512-500Kbps, security monitoring, fire alarm, industrial control, etc.
2	460800	800	Stage lighting control system DMX512-500Kbps, security monitoring, fire alarm, industrial control, etc.
3	230400	250	Security monitoring, fire alarm, industrial control, etc.
4	230400	250	Security monitoring, fire alarm, industrial control, etc.
5	460800	800	Stage lighting control system DMX512-500Kbps, security monitoring, fire alarm, industrial control, etc.
6	460800	800	Stage lighting control system DMX512-500Kbps, security monitoring, fire alarm, industrial control, etc.
7	230400	250	Security monitoring, fire alarm, industrial control, etc.
8	230400	250	Security monitoring, fire alarm, industrial control, etc.
9	460800	500	Stage lighting control system DMX512-500Kbps, security monitoring, fire alarm, industrial control, etc.
10	460800	500	Stage lighting control system DMX512-500Kbps, security monitoring, fire alarm, industrial control, etc.
11	230400	250	Security monitoring, fire alarm, industrial control, etc.
12	230400	250	Security monitoring, fire alarm, industrial control, etc.
13	230400	250	Security monitoring, fire alarm, industrial control, etc.
14	230400	250	Security monitoring, fire alarm, industrial control, etc.
15	230400	250	Security monitoring, fire alarm, industrial control, etc.
16	230400	250	Security monitoring, fire alarm, industrial control, etc.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Application