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Old 29-12-2012, 14:04   #1
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NMEA - Serial 9 pin diagram

I am in the process of connecting my Standard Horizon AIS to my laptop running OpenCPN. I have looked for some sort of diagram showing which pins to solder my NMEA signal-out wires to the serial plug, but have't been able to find one that works. Does anyone have a 9 pin diagram showing which pins OpenCPN is looking for when I tell it to use the serial port for incoming AIS data?
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Old 29-12-2012, 14:17   #2
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Re: NMEA - Serial 9 pin diagram

Assuming this is the GX2150 VHF with AIS, where is the VHF/AIS getting GPS data from? This must be supplied in order for the VHF to output AIS data.
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Old 29-12-2012, 14:47   #3
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Re: NMEA - Serial 9 pin diagram

google 9 pin serial connector. Usually the pins you want are 2, 3, 5.
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Old 29-12-2012, 14:55   #4
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Re: NMEA - Serial 9 pin diagram


This 9 pin diagram is from my Furuno GP-32 manual and shows the data and pin allocations.

Hope this helps.

Hmm, seems the diagram won't paste so I'll try to explain.

Pin 5 is GND (in my case a blue wire), pin 2 is RXD (yellow), pin 3 is TXD (green) pins 4 (DTR) and 6 (DSR) should have a jumper link between them as should pins 7 (RTS) and 8 (CTS).

If this isn't clear you can download the furuno gp-32 manual for free and look at section 7.13 page 43.

sorry I couldn't be more helpful.
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Old 29-12-2012, 15:17   #5
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Re: NMEA - Serial 9 pin diagram

Maptech : Topo Maps Charts Navigation Software GPS and Online MapServer
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Old 29-12-2012, 16:15   #6
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Re: NMEA - Serial 9 pin diagram

Caution: "serial" covers a lot of territory. The NMEA 0183 standard uses RS-422 interfaces, while most computer equipment uses RS-232 interfaces. These days most RS-232 interfaces can successfully interconnect to RS-422, but there are still many that do not. Your best bet is to buy a USB RS-422 adapter.

Greg
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Old 29-12-2012, 18:03   #7
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Re: NMEA - Serial 9 pin diagram

I am aware that the SH requires GPS input.

I have a USB RS-232 adapter...not a USB RS-422 adapter and being in Mexico I doubt I'll get one anytime soon.

Thanks for the link to the diagram. I did Google 9 pin Serial diagram and came up with many different 'standards'... I guess I was hoping someone who helped create the software would know what OpenCPN was looking for.
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Old 29-12-2012, 18:37   #8
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It's not that complex pin 2 is receive data and pin 5 is ground on a 9 pin serial male pin, which is typical on the computer side as its a DTE device.

422 will generally connect ok to 232 ports but sometimes the voltage level isn't enough to trigger the logic level. This is less a problem in modern designs as the converter chips are more flexible

Note that some standard horizons have weak pull-ups on the Tx lines and this can cause interfacing issues

Dave
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Old 05-01-2013, 19:34   #9
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Re: NMEA - Serial 9 pin diagram

You were all right. It was terribly simple. Thanks for all the advice. Everything works great.
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