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Testing the multiplexer without NMEA or SeaTalk data

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PostPosted: Wed May 23, 2012 4:07 pm    Post subject: Testing the multiplexer without NMEA or SeaTalk data Reply with quote

* You have receive the Multiplexer and you would like to know if it is working.
* Maybe you would just like to start learning how to use the configuration software.
* But you don't have any NMEA or SeaTalk devices on your desk.
(Usually they are are all on the boat).

There are quite a few things you can do with the multiplexer without NMEA or SeaTalk devices available.

What we need at least is :
* The multiplexer
* A 12 Volt power supply. (Without 12 Volt, the multiplexer won't work.)
* A Computer with a free USB port running MS-Windows or Linux

First of all, plug in the USB cable into your computer and connect the multiplexer to 12 Volt supply.
When using Windows, I recommend to install the driver from the CD before plugging in the multiplexer for the first time.
Windows can become somewhat confused, when a driver is installed after the device is allready plugged in)

Using Windows, you should now find a new COM port in the windows systemmanager. Something like this :

Here the multiplexer is assigned to COM3:
Using Linux, just open a terminal and type "dmesg". You should find something like this :


[ 1932.381329] usb 6-2: Detected FT232RL
[ 1932.381335] usb 6-2: Number of endpoints 2
[ 1932.381340] usb 6-2: Endpoint 1 MaxPacketSize 64
[ 1932.381345] usb 6-2: Endpoint 2 MaxPacketSize 64
[ 1932.381350] usb 6-2: Setting MaxPacketSize 64
[ 1932.384169] usb 6-2: FTDI USB Serial Device converter now attached to ttyUSB0
[ 1932.384184] usbcore: registered new interface driver ftdi_sio
[ 1932.384188] ftdi_sio: v1.6.0:USB FTDI Serial Converters Driver

Here the multiplexer is assigned to /dev/ttyUSB0
Using Apple - to be filled later. I don't have an apple computer.
Ok, now the computer has found the multiplexer and we know the port name assigned by the operating system.
Now start the configuration software from the CD.

In the menu select Port -> Parameter....

In this example I typed in /dev/ttyUSB0.
Please enter your communication port here.
Set baud rate to 38400 and press OK

Now - back on the main screen - just press the "connect" button

The configuration software will now read some information from the multiplexer. It will read things like software version, current config settings etc.

When you see this screens - you already know, that the main part of the multiplexer is ready and working.

Now press :

You should see something like this :

Here we have a StalkNmea Multiplexer
Software Verison 1.01
Internal Uart ( NMEA ) port check passed and ports are activated
Internal SeaTalk port check passed and port is activated
Serial port test : done

If you like to test the NMEA Ports, you can use a loop-back plug.

If you plug that Loop-back-Plug into any NMEA port and press again,
you should see that port number in the line saying "Serial port test : 1 done"

In this example, I put the Loop-back-Plug into port #4

Don't be confused.
In the manual NMEA ports are counted 1..4
In the internal firmware, they are counted 0..3

The next thing you could try is testing the internal timers.
Just click on

You should see something like this.
One line every second.

Of couse the "Buffer levels" stay empty.
Since we don't have any NMEA or SeaTalk devices attached, there is no data coming in or going out that could fill the buffer memory.

To be continued ...
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    PostPosted: Mon Oct 07, 2013 11:08 am    Post subject: Reply with quote

    To test the Mux Device on the desk i used this Software:

    NMEA Generator:

    Its free to use for 2 weeks.

    Just connect :
    RS232 ----> NMEA Mux In Port
    Pin 3 (TxD) to NMEA (+)
    Pin 5 (Gnd) to NMEA(-)
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