Description
Add isolation to an RS232 port to protect against ground loops.
OPTO-4 Serial Opto Isolator
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Add isolation to an RS232 port to protect against ground loops. The OPTO-4 provides a safe and low cost way of connecting an RS422 (NMEA 0183) system to an RS232 (PC COM port) system, or any other device with a standard RS232 9-pin port.
The OPTO-4 provides comprehensive galvanic OPTO-isolation to protect the PC input/receiver, plus important spike suppression to improve the PC output/transmitter protection. Initially designed for systems wishing to receive NMEA 0183 data without the risk of ground loop damage, the flexible OPTO-4 can be used to interface any RS422 and standard RS232 connection, whilst powering itself from the RS232 port, making installation simple and very quick.
Serial Opto Isolator
£80.34
Estimated delivery dates: Mon 6 Jul, 2026 - Wed 8 Jul, 2026
NMEA 0183 PC Opto-isolator cable, DB9 female, shielded
In stock
Additional information
| Weight | 0.13 kg |
|---|---|
| Dimensions | 10 × 3 × 12.8 cm |
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5 year guarantee
across entire Actisense range as standard
The Actisense opto isolator design integrates an over-moulded case for excellent water resistance and a small footprint for installation into tight spaces.
FEATURES
- One RS422 OPTO-isolated input
- One RS422 (NMEA 0183) output
- Up to 115200 baud
- Port powered
- Shielded cable and case
BENEFITS
- Protects PC input/receiver from damage
- Water resistant cable.
- Ruggedized over-moulded case suitable for harsh environment
- Quick and easy to install
Ordering Information
(Part number/s)
- OPTO-4
When isolation is required in both directions and/or the PC doesn’t have an RS232 port, the Actisense USG-2 offers bi-directional isolation in a USB to RS422 (NMEA 0183) form.
Older marine PC’s and certain NMEA 0183 instruments utilise a DB9 connection rather than a USB or differential RS-422 Port. The OPTO-4 can be used here to transfer NMEA 0183 data without having to worry about ground loops thanks to the opto-isolation technology. The OPTO is also powered from the RS-232 / serial port on a PC, making installation even easier.
| Electrical | |
| Galvanic Isolation | NMEA Listener Only |
| NMEA Listener / Input Voltage | +/-15V Continuous Maximum +/-35V Max < 1 Second |
| NMEA Listener / Input Signal Thresholds | Logic ‘0’ +2V to +15V, Logic ‘1’-15V to 0V |
| NMEA Talker / Output Voltage & Current | Dependant on Host RS232 Interface. Typically +/-7V to +/-15V @ 10mA Max |
| RS232 Voltage on Host | +/-7V to +/-15V |
| RS232 Port Total Current Consumption | 2mA to 5mA depending on RS232 Voltage |
| Speed / Baud Rate | 4800 to 115200 Baud |
| Mechanical | |
| Housing Material | PVC Black |
| Thumb Screw Material | PVC Orange |
| Screw | Steel, Nickel Plated, M2.8 Thread |
| DB9 Connector | 9 Pin Female |
| Cable Length | 1.5m |
| Cable Wire | 22AWG (17/34AWG) Tinned Stranded Copper |
| Cable Jacket | PVC |
| Shield | Al Mylar Foil |
| Cable Outer Diameter | 5.5mm |
| Approvals and Certifications | |
| Operating Temperature | -20°C to +70°C |
| Electrical Specification | Meets IEC 61162-2 |
| Weight | 100g |
| Guarantee | 3 Years |
| UL Certification | Cable E137250 |
| RoHS Compliant | |
- One RS422 OPTO-isolated input to protect your PC from ground loop damage
- One RS422 (NMEA 0183) output
- Up to 115200 baud
- Powered via PC serial port for simple installation
- Shielded cable and case make it suitable for electrically noisy environments
NETWORK DIAGRAM
Here are some Frequently Asked Questions about the OPTO-4.
Need more help? Visit our Support Centre.
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