Hi everyone, I’ve been stuck on a serial communication problem for days, My hardware setup: Host is a regular desktop PC, connected to ZLG NS1 serial server via Ethernet cable NS1’s RS232 port is wired to the MCU’s UART pins, hardware ...Read more
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American Samoa citizens can apply for a Cameroon e-Visa online before traveling. The process is pretty easy — you just fill out the online application, upload your passport, travel details, hotel booking, and a passport photo, then pay the visa fee online.
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Sounds like the hardware is probably fine, but the NS1 serial server settings or UART timing is causing the issue. If your PC only receives MCU data after sending multiple times, usually it’s one of these problems: Baud rate mismatch Wrong flow control setting Serial buffer delay in NS1 TCP packet mRead more
Sounds like the hardware is probably fine, but the NS1 serial server settings or UART timing is causing the issue. If your PC only receives MCU data after sending multiple times, usually it’s one of these problems:
First, double-check that the PC, NS1, and MCU all use the exact same UART settings:
Then check the NS1 serial server config:
Another super common issue is the MCU sending too fast right after boot. The NS1 may not finish socket initialization yet, so the first packets get dropped. Add a small startup delay on the MCU side like 500ms–2s before UART transmit.
Also test with a serial tool like Hercules or TCP Test Tool and send continuous data instead of single packets. If continuous streaming works but single messages fail, it’s almost definitely a packet timeout/buffering config issue inside the NS1.
One more thing — if the MCU UART uses interrupt RX/TX, check whether the transmit buffer is actually flushing completely. A lot of MCU UART drivers silently lose the first byte sometimes.
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