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12 years, 12 months ago.
RS232 interfacing
Hello mbed pros. I have a problem in connecting a RS232 interfacing to LPC1768. I want to transmit commands and video through RS232 to the microprocessor. Can I just solder an interfacing in serial with p28 & p27? Do I need a MAX3232 kind of things?
Best regards!
3 Answers
12 years, 11 months ago.
I think that most PTZ controlled ( security ) cameras have usually 2 wire RS485 interfaces . So , I suppose you should go this way
mbed TX > ttl to 232 stuff > 232 to 485 stuff > PTZ controller or mbed TX > ttl to 485 stuff > PTZ controller
mbed TX output is 3.3 V level
check this out as well
http://mbed.org/questions/34/RS485-Are-pins-9-and-10-5V-tolerant-when/
12 years, 12 months ago.
I assume that isnt too/from a computer? Because then you can simply use the USB interface.
Assuming it is another device: it depends. If it is real RS232 you will indeed require a MAX232 or similar. Sometimes however it is RS232 with TTL signal levels (UART), in which case you can directly connect it to the mbed.
12 years, 12 months ago.
It is a RS232 wire used to connect PTZ camera. I will program the mbed to convert from one portocol to another. So, I have to connect mbed to PTZ camera and controller with RS232. - Neil Powell posted about 13 hours ago