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RS232 , RS485 , RS422 and USB are not Protocols those are interface port (connectors) each one has electrics chararcteristics .RS232 is used for short distance (over 15 meter and depends on baud rate ) with level voltage +-/15 volt . RS485 is used for long distance (you can say more than 100...
YES (start bit ,baud rate, data length (7,or 8 bit ) stop bit ) are in the controller setting that has (USART-bult-in function ) many manufactured controllers comes with already setting (8 bit data length) so the setting get short only (start ,baud,stop) regarding checksum byte(s). there is no...
in my previous post i didn't pay attention to VM111 because you was taking about mcp2221 and PuTTY program at the end of issue you want to run your VM111 PIC programmer . why you didn't say how can i use my programmer by use USB and what use of putty here. anyhow VM111 is old type programmer...
checksum byte(s) is neglected like parity bit. parity by default is "non"(no even and neither odd) checksum is bytes (two byte) is sent at the end of the data string as in the" RTU mode" and "ASCII mode" protocol. which is called "CRC CHECK" instead of including it "checksum " with UART...
hello
first thing does your P.C has RS485 port to configure PuTTY works with RS485 ? i think the answer is NO but if you say RS232c port i guess yes maybe only in the old disktop P.C but modern lap doesn't has . so you have to have a converter adapter RS232 or RS485 to USB . the converter...
Yes
Many serial protocols use checksum (additional bytes added at the end of the data string) to check the data integrity, as errors might occur during data transmission. There are many types of checksum, from the simplest uses
it is used in UASRT communication RS232 protocol but neglected in...
Hello
from data sheet of MCP2221
• Enumerates as a Composite USB Device (CDC
and HID) Using Standard Drivers for Virtual Com
Port (VCP) on the Following Windows® Operating
Systems: XP® (SP3), Vista®, 7, 8, 8.1 and 10
• Configuration Utility for Establishing a Custom
just connect MCP2221 to...
Hello
no thing else in DB9 pins are used in UART because UART means (universal Asynchronous receive transmission) it just needs setting the parameters (start bit ,baud rate, the parity,stop bit, check sum)
kamal
hello
you can convert RS485 to USB .RS485 use for long distance(industrial application) to transceiver the data the cable used in RS485 is twisted pair cable(two wire) . regarding the pins 8,9 of DB9 connector that depends in you design .there is already adapters conv. from RS485 to USB
kamal
hello
you may find "solid state relay -use Triac" simple to design and it is made for high current application search this link https://www.bristolwatch.com/ele/triacs2.htm
https://www.wolfautomation.com/blog/wp-content/uploads/2019/01/SSR_101-01.jpg
kamal
i have seen you first post and searched in google the "INFACO marked " it seems this charger is for group of Ni-Cd batteries . my opinion if there is schematic diagram i could approach you to find the defect
kamal
Hello
The load (light bulb)goes in series with the dimmer output and T.C . but i note another some thing strange in the ESP8266 NODE MCU dose lib of it could generate zero -cross detector signal which dimmer needs as i know (Z-C) signal is generate from mains power only ( low power rectifier...
hello
the connection between load terminals of the dimmer and light bulb is wrong i see from your schematic diagram you connected (L-N mains terminal directly to load terminals of the dimmer which is the wrong)
kamal
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