The max232 tag has no wiki summary.
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1answer
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How to connect RS232 (“Opto-RS232”)
--Background--
I'm setting up a pretty standard RS232 interface from a digital caliper to a microcontroller, via a MAX232 chip (or in my case, MAX3222, which is the 3.3V-supply variant with 2 ...
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4answers
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Do I have to use a MAX232 chip?
I am trying to interface my ATmega chips to the computer using a serial interface. I have read that this can be done directly by connecting the appropriate pin between the chips and the serial pin. ...
4
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3answers
567 views
Does Vs+ and Vs- need to be connected on a TRS232E?
I have a TRS232 RS-232 Driver(max232 equivalent). On the data sheet, it shows a capacitor on Vs+ and Vs- (1uF)and they just have arrows saying they go somewhere. Can I omit these connections and ...
4
votes
1answer
186 views
Why MAX232 works without any capacitors?
I was playing today with a very simple setup of pic16f876 and max232 connected to the COM port of a PC running a terminal emulator. I was just testing (the uc simply echoes anything it receives) when ...
3
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4answers
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Can I use 10\$\mu\$F caps in a MAX232?
this is just a quick and dirty question. I don't understand the purpose of the 1 \$\mu\$F caps in the MAX232 circuit. What do they do, exactly? Can they be skipped? Can they be swapped with 10 ...
3
votes
1answer
202 views
Interfacing a PIC microcontroller to different logic levels
I'm planning on interfacing a PIC microcontroller to two devices which operate on two different logic levels and I'm wondering what the best way of approaching this is. I'm rather inexperienced in ...
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2answers
1k views
Using MAX232 to fix prolific usb to serial voltage levels
I have a hobby PIC programmer (K8048) that uses rs232 to communicate with PC. My new laptop doesn't have rs232 port so I bought a prolific usb to serial converter to interface with this programmer but ...
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2answers
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PIC18F + MAX232 USART Bizarreness
Okay, I've been struggling with this for weeks, and it's blowing my mind. I have been working with PICs for a long time, and I'm very confused as to why I can't make my USART work.
First off, a few ...
1
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1answer
151 views
RS-232 Zero (-7V) drops when I connect db9 connectors
I'm interfacing with a system using RS-232. To communicate, I use MAX2322 for TTL <-> RS-232 to interface with PIC microcontroller and PL2303 for USB <-> RS-232 to interface with PC.
All of the ...
0
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2answers
402 views
Arduino serial communication with printer
I'm working on a project with an Arduino Mega 2560. I connected the board to a MAX232CPE in order to communicate in serial mode with a thermal printer.
I connected the MAX232 to one of the 3 extra ...
0
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4answers
403 views
serial driver for full 3.3v uC to back-of-computer
I'm looking for an integrated circuit that can connect a lpc17xx (microcontroller) to the serial port on the back of a standard computer. The lpc17xx has a UART controller with 8 pins.
RXD
TXD
CTS
DCD
...
0
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2answers
2k views
Getting weird characters in hyper-terminal on serial connection of PC and Atmega-16
I have a Atmega-16 based board, connected via Max232 to pins 2,3,5 of a db-9 connector. The connector connects to a PC.
I am getting weird characters on hyper-terminal instead of normal "Hello World" ...
0
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1answer
61 views
pinning of MAX232
I just want to ask if there is ever a connection between pin 2 and pin 3 of MAX232. I did a continuity test between those two pins. One of my MAX232 has shorted pin 2 and pin 3. My other IC does not ...
