Radio Modem - Pacific Crest PDL

Hi there everybody, I need humbly ask for any advise.

I have a pair of Pacific Crest PDL (Positioning Data Link) Radio Modem. Both modems was set at same channel.

I hooked up one end with Aquadopp Profiler via RS 232 cable. The other end on my laptop also via RS 232 to my COM1. Connection was set to 9600 baud rate.

When activated, the Aquapro was connected, then it showed Error, Acknowledge not received, unable to write configuration.

Any help would be appreciated.

Pacific Crest PDL Modem

I assume you have verified that the AquaPro works when connected directly to the PC. Unless you have already done so, the first test is as always to do a loop back test. Connect everything and loop the RS232 signal at the end of the cable going to the AquaPro. Open the terminal emulator and verify that you receive the characters you type. You can also try to upload a small file while you have logging enabled, in this way you can verify the connection with larger amount of data.

You should also make sure that you have configured your modems with the Transparent Link Protocol since these modems also have the option to do packet switching.

The next step is to connect the AquaPro and check if you can receive break in the the terminal emulator. In command mode you can also check other commands, for example the GA command that will return the instrument configuration. If this works the software should work as well. If not, you can try to power up the AquaPro (make sure that it is in command mode) to see if you receive the banner in the terminal emulator. This will test the communication in one direction.

Let me know if you still have problems, there are always a few more things to try " />'>

Best regards,

Sven Nylund

Dear Sven:

Thanks for your help back there. But I still cant get the two way communication.
I have changed the modems to transparent w/EOT timeout, but there is still another transparent w/EOT character. Which do I select for the telemetry?

TWO WAY COMM
1. I have checked with the terminal, the break is received via modems.
2. Also GA command is received.
3. When I choose to program the Aquadopp with Aquapro Software, it showed Acknowledge Not Received. Unable to write Configuration.[I]Same as last trial.

ONE WAY COMM
A. I have programmed to run Aquadopp with Real Time Recording with a Laptop.
B. Then through radio modem, I can receive real time graphs and data with Aquapro Software.
Attention: Only with the same laptop only, when I shut down the Aquapro software, I lose communication completely when I turn it on again.

[U][/U]

Currently the Tx and Rx Frequency Channel is the same. Do I have to use a different freq for Tx or Rx?

Hope to hear from you soon, thanks again. " />'>

I have not got the complete documentation of the modems but I think you should stick to the transparent with EOT timeout. In order to get full duplex communication you should also select different channels for Tx and Rx.

What might be the problem is the EOT timeout (End Of Transmission), this probably means that there is a timeout associated with switching between receive/transmit in the modem. When you use the terminal emulator you will add delays during typing so you might not see the problem there when communication to the instrument. To configure the profiler to add a delay when switching from receive to transmit you can send the DS (Delay Serial) from the terminal emulator. Make sure to check for hex commands, type 44 53 64 00 in the command box and press send (note the endian of the two byte word value). You should see 06 06 as acknowledge if you have checked the binary mode box. This will add a delay of 100 ms (0x0064) when the Aquadopp switches from receive to transmit.

The actual value you select to use should correspond to the modem, hopefully 100 ms is a reasonable guess " />'>

Regards, Sven

Dear Sven,

ONE WAY COMM
A. I have programmed to run Aquadopp with Real Time Recording with a Laptop. I can receive back real time graphs and data with Aquapro Software although i restart the software after shut in down.

B. Then through radio modem, I can receive real time graphs and data with Aquapro Software with only as Aquapro software is continuosly on from begining (progammed the Aquapro) , I lose communication completely when I turn it on again after shut off the Aquapro software.

So, how can i get back to the real time graphs and data with Aquapro Software after i turn it on again after shutting down the software?

Hope to hear from you soon. Thanks a lot.

 

I just posted a new thread

in the Software forum that should answer your question.

 

Best regards,

Sven Nylund

Dear Mr. Sven,

 

I could not get to find the thread in the Software forum that you mention, can you please pass me the link?

 

Thanks and reagrds,

Chuah

Dear Chuah, here is the correct link

http://www.nortek-as.com/forum/software/644656750#133343872

Best regards, Atle Lohrmann