EG915N, CMUX Issue with uart

IoT Modules LTE Standard Module
1

Hi,

I am using EG915N in CMUX mode with Esp32s3. The communication interface is UART.
I am able to connect to Internet, get and send data. But ,randomly I guess, we get frame errors. Some message from EG915N is not starting or ending with 0xF9 (Some parts of the messages are missing). Below is a modem details and sample of logic analyzer snipshot. Any help would be appreciated.

AT+QGMR
EG915NEUAPR03A02M16_01.200.01.200

AT+CGMR
EG915NEUAPR03A02M16

ATI
Quectel
EG915N
Revision: EG915NEUAPR03A02M16

I also increased CMUX max frame size, but still.

image
image1804×376 27.9 KB

Best regards

1 Like
2

Hi @ibrahim
Can I ask if you have enabled flow control? Does this problem occur when the data flow is large?

1 Like
3

Hello @lyman-Q
We both tried ‘no flow control’ and ‘software flow control’. Both cases. issue remains.

And when the data flow is large, issue occurs more frequently.

1 Like