Re: ASCOMPAD and PMC-8 Connection Problems


I have created an Explore Scientific Knowledge Base article from this message here:

Jerry Hubbell
Director Electrical Engineering
Explore Scientific, LLC.

---In ESPMC-Eight@..., <hubbell_jerry@...> wrote :

Hi Mark,

There is nothing in the firmware which forces it to select back to WiFi when the PMC-Eight powers up. Unless the ESX! command is sent it will stay at its current value. As has been stated earlier, just powering down the PMC-Eight and powering it back up will not switch the communications port back to WiFi. 

Having said that, you may be seeing that the SSID for the PMC-Eight is still available for connection and you can in fact connect to it as the WiFi module always powers up when booting up the PMC-Eight. The firmware switch selecting the communications channel is stored in the EEPROM memory (permanent) and can only be changed with the ESX! command.

If you cannot make the serial connection work then there is something else going on with your connection. To verify that your serial cable works fine, you can do the following procedure:

1. Connect your serial cable to your computer
2. Determine the com port assigned to your cable.
3. Start the Parallax Serial Terminal Program

4. Select the proper com port and set the BAUD rate to 115200
5. Power up the PMC-Eight
6. The splash screen for the PMC-Eight should show up in the terminal verifying that you have proper communications with the controller.
7. OPTIONAL - You can send a command via the terminal to see the controller respond, %%% (Diagnostics Mode OFF), or ESB! (reboot), 

If you do not see the splash screen, then verify that the controller is actually selected to the WiFi channel by connecting ExploreStars to the PMC-Eight and making sure it works. If that works fine, then do the following:

1. Go through the procedure again to switch from WiFi to Serial.

2. Try and connect to ExploreStars again to make sure you have actually switched to the serial connection.
3. Follow the procedure above to see if you get the splash screen.

Remember, when switching from WiFi to serial using the ESX! command, you should see ESX0! as a response verifying that it is selected to the serial channel. If you do not see a response then it did not switch.

Hope this helps. Let us know how it goes

Jerry Hubbell
Director Electrical Engineering
Explore Scientific, LLC.

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