ITTSB.EU Blog Forum
AC Power Meter | PSU | UPS evaluation | Battery Testers - Chargers | CCTV => AC Power Measurement of appliances & Technical discussion => Topic started by: Kiriakos GR on December 06, 2024, 12:19:40 PM
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Our world wide web this is full of questions about TTL UART and safe to use cable length.
But the answers from the side of consumers they are unclear. :P
This is of why, I searched for clues, from the industrial world.
First example: The FTDI chip maker, for TTL UART at 3V (the weaker TTL signal) they offer non shielded cable up to 1.8 meters length.
Part No: TTL-232R-3V3
Data Rates: 3MBaud
Cable Details: 6 core, 5mm UL2464 24 AWG
USB to UART cable Supports +3.3V UART signals
Second example: The FTDI chip maker, for USB to UART, 3.3V TTL logic level, Raspberry Pi compatible flying leads
Part No: TTL-232R-RPI
Cable Length: 1.0m
I/O Voltage: TTL
Virtual Com Port: Yes
Third example Waveshare (Industrial USB TO 4CH TTL Converter, USB To UART)
SKU:21619 Supplied cables:
USB cable 1.2m length
TTL 4x 20cm its one
Note: FTDI The cables, which are 1.8m long, can cope with data transfer rates of up to 12 Mbaud
Note: Waveshare Host port with CH343 : USB, Baud-rate: 300-921600bps (1 Mbaud), Transmission distance: ~5m
Note: Waveshare RS232: Transmission distance: ~15m (max theoretical supported 1 Mbaud)
Note: Waveshare RS485: Transmission distance: ~1200m
Note: Waveshare TTL : Maximum Transmission distance: Not specified ..
Note: Part No: FT232RL USB Full Speed to Serial UART IC, Data Rates: 3MBaud | USB Speed: Full Speed (12Mbps)
Note: WinChipHead (WCH) In applications with higher communication baud rate, it is recommended to enable hardware automatic flow
control.
Full-speed USB is only 12Mbps, considering the protocol overhead and other factors, in practical applications, the serial port should be avoided in a continuous or full-duplex of 3Mbps and above high-speed communication status.
The allowable baud rate error of CH343 UART receiving signal is less than 2%, the baud rate error of UART transmitting signal is less than 1.5%.
To be continued ..