USG-1 USB to NMEA
Connect your boat's data network to your PC with the safety of full electrical isolation.
The Actisense USG-1 is the safest way to connect a boat's data network to an on-board PC. It converts a USB port into a bi-directional serial port suitable for connecting to a marine standard NMEA 0183 data bus.
The ISO-Drive output and OPTO input provide full isolation, making installation simple and free from ground loops.

The OPTO input uses the Actisense isolation circuitry to protect any connected equipment from most common system faults. The isolator can receive very low level differential signals that are often too small to be received by a PC serial port.

The USG-1 overcomes all the problems of using a low-cost USB to RS232 cable from a computer store (when handshaking is not required). It eliminates the risk of damage to the PC as it provides complete isolation.
Geek Mode
  • Create a serial port connection to an NMEA 0183 system, that may be on a different power circuit from the PC
  • Connect two PCs together that are on different power circuits
  • Provide a compliant NMEA 0183 port from a USB port
  • Receive low level differential signals that are too small to be received by a PC serial port
  • Free up PC serial/COM port for other uses

Technical Specification

Supply voltage From USB port 4.75 5.25 V
Supply current (drawn from USB port)

Supply voltage 5v (no load)

Supply voltage 5v (output shorted)

40

75

46

80

mA

mA

Opto-isloated in NMEA 0183 version 1-3 & PC Serial        
Input voltage tolerance

Continuous operation

Short term operation (< 1 sec)

-15

-35

+15

+35

V

V

Differential input voltage Required level for data to be detected 1.8 2.0 V
Input current   20 9.0 mA
Galvanic isolation Between input & output - 2500 V
Overdrive protection   - 40 V
ISO-DRIVE Flexible out NMEA 0183 version 1-3 & PC Serial      
Differential output voltage

Continuous operation

Max. 100 ohm load

-5.2

2.1

+5.2

-

V

V

Output current (Max) Max. 100 ohm load - 21 mA
Output current (Short) Due to short circuit protection 50 55 mA
Galvanic isolation Between Opto-input and (USB ground) - 1500 V
Static discharge protected   - 15000 V
PC Comm settings        
Baud rate Set in PC software Comm port settings 300 115200 bps
General        
Ambient temperature   -20 +70 °C
Guarantee Actisense guarantee   3 Years 
USG-1 USB to NMEA
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Testimonial
"We are delighted to work with Actisense. Their high quality products and service means there is no need to sort out warranty issues and problems. The products are well designed and meet almost every customer requirement. It is also a pleasure to deal with the nice and helpful staff, who are always easy to deal with.”
Jani Jarvinen, Managing Director, Promarine Ltd
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