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Topic Summary

Posted by: Jan
« on: March 06, 2026, 12:17:20 pm »

Finally, the cause was not the device itself or the network configuration, but the power supply adapter, which started to lose voltage after some time.

The label of the power supply adapter is attached. Thanks, Stanley.

Apparently, this is a problem with one series of these power supplies that were included with the devices in 2024. If you have this power supply, consider replacing it, we will send you another one for free. This only applies to the power supply with the specified label, year of sale and European plug. Generally, these power supplies were not the cheapest and their quality has been proven over the long term.
Posted by: Jan
« on: September 10, 2025, 09:34:52 am »

Received all three units. Thank you. They are operating normally in entire range of temperatures. Two Lantronix devices were set to incorrect speed 9600 and 19200 respectively. After setting 115200 everything works. Will keep it running for some day but I don't expect any issue. I guess you were not connected to the Lantronix but to some other device or service in the network? Or to port 80 instead of 10001?

Current P275E fw version supports also connection from a web browser so the HW operation can be verified that way as well. Try another 5V power supply.
Posted by: Jan
« on: September 03, 2025, 11:13:08 am »

Thanks for the information. Please feel free to contact me via email to arrange the replacement. I'm eager to find out what happened to the Lantronix HW or SW.
Posted by: Stanley
« on: September 03, 2025, 11:09:35 am »

Hi, most probably the lantronix is the cause of problems.
Tried with different PC, no luck, tried to measure any data on lantronix pins, no luck.
Tried to set up the gpio port on the lantronix to output, tried sending high / low, no luck.
The embedded web server works, but seems no electric signal on the pins.
When using the micro usb port without the lantronix board, every communication works fine.
So I'll send back the devices for checking.
Thanks for help.

Best

Peter
Posted by: Jan
« on: September 02, 2025, 04:45:42 pm »

In terminal, type for example ?F for getting current frequency. The terminal speed, if applies, shall be 19200.
Posted by: Stanley
« on: September 02, 2025, 04:41:53 pm »

Hi,

maybe something to test via terminal app? did not check the command list, can you recommend something?
Will try with different pc, the pc is very standard and very new, no extra virus killer yet on the machine, fw is turned off for the tests.
Do I need to run FM Scope as admin?

Best

Peter
Posted by: Jan
« on: September 02, 2025, 04:11:23 pm »

The firmware update works so there's probably nothing wrong with the device communication port. The firmware update uses the same communication channel like the FM Scope. I would focus on the PC software. I don't have any simple steps you can follow because such problem has never been reported. I would recommend to send the unit back to us for inspection. Try different PC first and turn off antivirus etc.
Posted by: Péter
« on: September 02, 2025, 03:09:30 pm »

Hello Jan,

No luck, tried once more. The only thing what is communication with the motherboard, is the firmware update utility.
It seems fw update runs fine to 2.2e r2.
But after that there is no communication with fmscope. FM Scope opens the com port or network com port, but there is no data coming from the device.
Tried with two different devices.
Disassembled it, tried the connection between motherboard and ethernet to serial board with multimeter, the connection is ok.
There is no oxidation sign, even there are no bird's nests or mouse family integrated :), everything is clean and tidy.
FM scope is 1.7.1, OS is win11 pro x64. Lantronix version is 7.0. something, did not try to update it.
Tried with two different usb to serial converter.
I did not tired with micro usb cable.
Any idea to test? Maybe an online video call (viber or so?)?
Next day I may be take my oscilloscope, what can decode RS232 (never tried yet), and I may check the data pins of converter.

Best

Peter
Posted by: Jan
« on: September 01, 2025, 08:46:05 pm »

I administer the P275E devices for more than 7 years, some operating in outdoor conditions. They still work fine and such problem has never been reported by anybody. Thus I guess it is not a hardware issue. But who knows... Of course, we can replace your device with another one at any time under warranty.

Apply the latest fw version 2.2e r2. Go to the XPORT web interface and select Apply Defaults. Then go to the XPORT web interface again and configure the Network and Serial Channel according to the latest pdf manual.

If this does not help, disassemble the two internal boards and check/clean the golden-plated connector between them (referenced as J2 on both boards). The pin assignment can be found in the original P275 manual.

Posted by: Peter Sztano
« on: September 01, 2025, 02:52:25 pm »

Hi! I have the same problem with multiple P275E units.
Seems like the port settings are all ok:
RS232, 115200, 8, None, 1, None.
Seems like the FM scope connects to the unit, but no reply at all.
When connecting via serial cable, the FM scope works fine.
What may go wrong?
The units were working fine for months, after some time it begin to be first unreliable, and then no connection via internet.
Is it possible that the built in Lantronix lost serial functionality? Something may be to check with oscilloscope?

Best

Peter
Posted by: n.pison@springo.it
« on: June 14, 2024, 08:04:39 am »

Thanks! Now it's works fine!
Posted by: Jan
« on: June 13, 2024, 11:08:28 am »

Run the Device Installer and make sure the serial port speed is set to 115200. See the device manual for details.
Posted by: n.pison@springo.it
« on: June 13, 2024, 09:19:14 am »

Hi all,
I have a P275E Fm Monitor. This hardware works fine with the serial port and the software FM Scope and I configured the IP correctly.
When I try to connect to P275E trough TCP/IP, the FM Scope tells me "Connected to xxx.xxx.xxx.xxx:port" correctly but when a try to click on Tune with frequency selected nothing is happening.
Anyone else have the same problem?

Firmware version of P275E is 7.0.0.3 and the FM Scope is the latest version

Thanks!