I have a question about these 4 wires. Are they RS422 or RS232? I understand that NMEA0183 should be RS422, but it appears that sometimes it is not so.

I'm trying to interface these 4 wires to a serial port via a RS422 to Serial converter and its not working.

Thanks for your help!

Views: 338

Reply to This

Replies to This Discussion


Raymarine NMEA 0183 ports are designed to the NMEA 0183 standard, which is essentially RS422.  The AIS500 is manufactured with a DE-9 serial plug to support interfacing the AIS500 with a PC for use with the ProAIS application or other PC application.  In doing so, the BAUD rate will be 38400.  One should not simultaneously interface the 38400 BAUD leads of the AIS500 to a product (ex. MFD) and use the aforementioned DE-9 serial interface, as the AIS500's 38400 BAUD leads are additionally connected to the leads of the DE-9 serial interface.

If using the AIS500's DE-9 serial plug to interface the AIS500 to your serial to USB adapter, then please note that the most cause for communications failures between a PC application and a NMEA 0183 device are

  • incorrect installation of the serial to USB adapter
  • inferior serial to USB adapter design
  • incorrect configuration of the PC application 

Raymarine and many other marine electronics and navigational software application manufacturers recommend or re-brand the SeaLevel Model 2105R and similar SeaLevel serial communications products for customers seeking a serial to USB adapter for use with their NMEA 0183 devices.  Communications between the AIS500 and PC may be tested using the ProAIS applications.  It should also be noted that a serial COM port cannot typically be shared be more than one application unless application software is installed on to PC to support COM port sharing (ex. GpsGate, etc.).

Thanks for that reply. I'm using a FTDIChip RS422 to USB serial converter...here is a description of the wires from the FTDIChip..

Colour Name Type Description
Black GND GND Device ground supply pin.
Brown CTS+ InputClear to Send Control + (B), Input
Red TXD- OutputData – (A) Output
Orange TXD+ OutputData + (B) Output
Yellow RXD+ InputData + (B) Input
Green RTS+ OutputRequest To Send Control + (B), Output
Blue RTS- OutputRequest To Send Control – (A), Output
White RXD- InputData – (A) Input
Grey CTS- InputClear to Send Control input – (A), Input

Which of these wires would I connect to?

Thanks for your help


I would recommend purchasing the serial to USB adapter recommended within my prior response and interfacing the adapter's DE-9 plug to the recommended adapter's socket.  Should you not elect to do so, then you may want to try interfacing the AIS500 to the serial to USB adapter as follows.

  • AIS500 38400 OUT+ to Adapter RXD+
  • AIS500 38400 OUT- to Adapter RXD-
  • AIS500 38400 IN+ to Adapter TXD+
  • AIS500 38400 IN- to Adapter TXD-

As Raymarine AIS receivers and transceivers feature a built in 38400 BAUD to 4800 BAUD multiplexer,

  • data received from an interfaced 4800 BAUD talker will be multiplexed with AIS data and the combined data stream will be transmitted by the AIS receiver/transceiver's 38400 BAUD output port (and corresponding pins of the DE-9 interface)
  • 38400 BAUD data received from a 38400 BAUD talker by the AIS receiver/transceiver's 38400 BAUD input port (and corresponding pins of the DE-9 interface) will be transmitted by the AIS receiver/transceiver's 4800 BAUD output port

As such, should the 4800 BAUD NMEA 0183 output from the E85001 PC/SeaTalk/NMEA 0183 Interface Module (which is interfaced to the SeaTalk bus featuring your ST60 Instruments) be interfaced to the AIS500's 4800 BAUD NMEA 0183 input leads, then the interfaced PC will receive a 38400 BAUD data stream including both AIS and instrument data.  Likewise, should your autopilot's 4800 BAUD NMEA 0183 v2.1 input port be interfaced to the AIS500's 4800 BAUD NMEA 0183 output leads, then 38400 BAUD NMEA 0183 sentences transmitted by the interfaced PC would be re-transmitted by the AIS500 to the autopilot at 4800 BAUD.

Thank you for the detailed very informative response! This is why I buy Raymarine products.

Thanks again

Best regards,


You're welcome.

Reply to Discussion




  • Add Videos
  • View All


  • Add Photos
  • View All

Latest Activity

J.R. Farrar posted a discussion

i70, E7 and Seatalk1 to Seatalk-ng converter kit

I currently have an E7 and the Seatalk1 to Seatalk-ng converter kit to communicate with my ST4000 Autopilot.  I'd like to add an i70 display to this setup. What are my options for connecting the i70 with the above two now?   Currently the E7 goes into one of the white connections on the converter, the yellow connects to the ST4000 the other white is power. The blues are terminated.Thanks!See More
16 minutes ago
Moderator - Raymarine, US replied to Raymundo's discussion DRAGONFLY Depth/fishfinder NO signal after 100ft
"Raymundo, I would recommend that troubleshooting begin by inspecting the transducer to ensure that it is locked into the down position and is not kicking up when operating the vessel.  It is additionally recommended that you verify that the…"
40 minutes ago
Jason Dunster replied to Jason Dunster's discussion Route and Waypoint Sending to e125
"Thank you very much. Confirming it would be possible to send individual waypoints (PGN) to the e125 over the SeaTalkng network from a PC? In my particular configuration, I am using Expedition Marine connected to an Actisense NGT-1 STNG. "
45 minutes ago
Underway - Raymarine, US replied to Steve Colbert's discussion Autopliot power consumption
"Standard draw for the system would be around that amp draw, the complete system should be fused at 15A, so in seas could be as high as around there. As for the power and the engine chargers, that is max output at full throttle.  I would…"
55 minutes ago
Moderator - Raymarine, US replied to Jason Dunster's discussion Route and Waypoint Sending to e125
"Jason, Please don't confuse bulk transfer of planned waypoints, routes, and track with navigational data PGNs associated a route which been commanded to be followed via the PC navigational planning application or a waypoint/cursor position…"
56 minutes ago
Raymundo replied to Raymundo's discussion DRAGONFLY Depth/fishfinder NO signal after 100ft
"HI  im away from my boat but Ive owned since June 2014 the model is dragónfly 6 or 7 and never updated the software but since 2 weeks old had that problem. "
1 hour ago
Dirk Husselman replied to Dirk Husselman's discussion Evolution Pilot holding course
"Good question. I will test that and report back. Also I'm wondering if when pressing auto and the rudder is not centered, if the autopilot wants to start out with a centered rudder which can cause the initial change? FYI. Have have used 4…"
1 hour ago
Michael Reusser posted a discussion

i50 tridata compatible with speed temp transducers?

I am having trouble with an i50 tridata, the transducers are from the previous st60. The depth works fine, however it appears as the speed transducer is not 'seen' by the i50.  Are they compatible?See More
1 hour ago
carl midson posted a discussion

Replacing st7002 head unit

My st7002 display has failed.  The course computer is still functioning correctly as it responds to course correction using the buttons on the unit correctly.My course computer is a SPX-30 circa 2011.  From a previous thread someone indicated that there is a minimum software version to support the newer display heads.  However as the display doesn't function I'm unable to retrieve the software version.To compound my problem the boat is in Panama and I need to pick up the relevant hardware and…See More
1 hour ago
steve krug replied to steve krug's discussion auto pilot wierdness!
"The compass is 5' away from anything electric, and, yes, the system worked fine when first installed. Hmmm, the system, like it's owner, is too deviant...."
1 hour ago
Underway - Raymarine, US replied to Dusty Rhoads's discussion ST6000 Autopilot heading freezes when auto selected
"Anytime, contact us if you have any further questions."
1 hour ago
Jason Dunster replied to Jason Dunster's discussion Route and Waypoint Sending to e125
"Based on your response and my general research, Raymarine is not currently compatible with any full function marine navigation software (was not including RayTech). Having to manually export GPX files from the marine navigation software to the…"
1 hour ago
Underway - Raymarine, US replied to M. John Hefner's discussion ST 6001 does not power up
"There are multiple wire coming into the course computer, compass, drive, control head, power. All areas where wires coming in are clearly labeled, you will be looking for POWER port."
1 hour ago
Underway - Raymarine, US replied to Al Sadler's discussion RL70C/fluxgate compass issues
"I have enclosed a fluxgate compass test, this will determine if the issue is with the compass or the course computer.   As for the date, that does come from the GPS unit.  Did you have a fix when looking at the date? Compass…"
1 hour ago
Underway - Raymarine, US replied to Michael Matthews's discussion EV-200 Autopilot remote controls
"The ST70 would just need a Seatalk NG spur cable into the Seatalk NG backbone."
1 hour ago
Moderator - Raymarine, US replied to Eric's discussion Dragonfly 4/5 Pro Wi-Fi Questions
"Welcome to the Raymarine Technical Forum Eric, Q1) Is there anything other than the obvious needed to use the Wi-Fi function on the Dragonfly 4/5 Pro?  By obvious I mean: the Dragonfly 4/5 Pro unit the Wi-Fi app a tablet or…"
1 hour ago

© 2015   Created by Moderator - Raymarine, US.   Powered by

Badges  |  Report an Issue  |  Terms of Service