how to czeck AT on USB serial port? (Linux)
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I have been graciously given PCB with LED's to monitor SOME serial data. It has LED for DRX and DTX. My current serial data code only sends and I have no connection to any "remote serial device" , but I can see both DRX and DTX flashing. Good. BUT why is DRX flashing? Is is because my "serial data communication" is set for "local loop back"? How do I verify my "modem" settings" AKA "AT" commands ? Thanks
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I have been graciously given PCB with LED's to monitor SOME serial data. It has LED for DRX and DTX. My current serial data code only sends and I have no connection to any "remote serial device" , but I can see both DRX and DTX flashing. Good. BUT why is DRX flashing? Is is because my "serial data communication" is set for "local loop back"? How do I verify my "modem" settings" AKA "AT" commands ? Thanks
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I have been graciously given PCB with LED's to monitor SOME serial data. It has LED for DRX and DTX. My current serial data code only sends and I have no connection to any "remote serial device" , but I can see both DRX and DTX flashing. Good. BUT why is DRX flashing? Is is because my "serial data communication" is set for "local loop back"? How do I verify my "modem" settings" AKA "AT" commands ? Thanks
FROM [https://e-junction.co.jp/share/Cat-1\_AT\_Commands\_Manual\_rev1.1.pdf\](https://e-junction.co.jp/share/Cat-1\_AT\_Commands\_Manual\_rev1.1.pdf):
Quote:
2.29. Controls the setting of eDRX parameters +CEDRXS Syntax Command Possible Responses(s) +CEDRXS=[,[,[,]]] +CME ERROR: +CEDRXS? [+CEDRXS: ,[ +CEDRXS: ,[...]]] +CEDRXS=? +CEDRXS: (list of supported s),(list of supported s),(list of supported s) Description The set command controls the setting of the UEs eDRX parameters. The command controls whether
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FROM [https://e-junction.co.jp/share/Cat-1\_AT\_Commands\_Manual\_rev1.1.pdf\](https://e-junction.co.jp/share/Cat-1\_AT\_Commands\_Manual\_rev1.1.pdf):
Quote:
2.29. Controls the setting of eDRX parameters +CEDRXS Syntax Command Possible Responses(s) +CEDRXS=[,[,[,]]] +CME ERROR: +CEDRXS? [+CEDRXS: ,[ +CEDRXS: ,[...]]] +CEDRXS=? +CEDRXS: (list of supported s),(list of supported s),(list of supported s) Description The set command controls the setting of the UEs eDRX parameters. The command controls whether
thanks for the reply. I probably did not formulate my question correctly. I was not asking about AT commands. I was trying to verify if some serial port parameters are being used to put the USB port itself into "loopback mode". Actually I am not sure if Linux serial port can use AT commands at all. I guess I need to look if Linux has "default modem" anything.
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I have been graciously given PCB with LED's to monitor SOME serial data. It has LED for DRX and DTX. My current serial data code only sends and I have no connection to any "remote serial device" , but I can see both DRX and DTX flashing. Good. BUT why is DRX flashing? Is is because my "serial data communication" is set for "local loop back"? How do I verify my "modem" settings" AKA "AT" commands ? Thanks
Hi Jana, Can you try these DRX Flashing (Local Loopback) DRX flashing could be due to local loopback. Check and disable it with:
stty -F /dev/ttyUSB0 -echo
Use minicom to send AT commands:
sudo apt-get install minicom
Open your serial port:
sudo minicom -D /dev/ttyUSB0
Type AT to check response (OK if working). I hope this will work for you and resolve your issue....... ;)