Question about RS232

Started by Bullwinkle in sci.electronics.design7 years ago 59 replies

Hi, i'm looking for an RS232 transceiver with these features 1. True Rs232 2. 3.3V as Vcc 3. 1Tx/1Rx 4. ESD protection 5. Lowest additional...

Hi, i'm looking for an RS232 transceiver with these features 1. True Rs232 2. 3.3V as Vcc 3. 1Tx/1Rx 4. ESD protection 5. Lowest additional components Any suggestion? I've found ADM3202: this doesn't meets all requirements (so i'm looking for something better), but reading datasheet i have a question: is true rs232 or not? If maximum voltage (with charge pump) is +-6.6V, how it can acce...


Cheapest way to add USB and 5 V and 3.3V power to a RS232 PIC project

Started by Jan Panteltje in sci.electronics.design4 years ago

Cheapest way to add USB and 5 V and 3.3V power to a RS232 PIC project Got some ebay USB To RS232 TTL PL2303HX Auto Converter Module...

Cheapest way to add USB and 5 V and 3.3V power to a RS232 PIC project Got some ebay USB To RS232 TTL PL2303HX Auto Converter Module Converter Adapter for arduino ebay object: 360750555245 Module has 5V and 3.3 V out (from the USB power). The PL2303 works 100% OK with Linux native drivers. Just connect to RS232 in and RS232 out, and power, and no need to write USB code, or get a sp...


Cheapest way to add USB and 5 V and 3.3V power to a RS232 PIC project

Started by Jan Panteltje in sci.electronics.design4 years ago 8 replies

Cheapest way to add USB and 5 V and 3.3V power to a RS232 PIC project Got some ebay USB To RS232 TTL PL2303HX Auto Converter Module...

Cheapest way to add USB and 5 V and 3.3V power to a RS232 PIC project Got some ebay USB To RS232 TTL PL2303HX Auto Converter Module Converter Adapter for arduino ebay object: 360750555245 Module has 5V and 3.3 V out (from the USB power). The PL2303 works 100% OK with Linux native drivers. Just connect to RS232 in and RS232 out, and power, and no need to write USB code, or get a sp...


Breaking the price barrier: An autoranging frequency counter with RS232 output

Started by Jan Panteltje in sci.electronics.design8 years ago 8 replies

I found a nice auto ranging frequency counter online here: http://freenet-homepage.de/dl4yhf/freq_counter/freq_counter.html Did not have...

I found a nice auto ranging frequency counter online here: http://freenet-homepage.de/dl4yhf/freq_counter/freq_counter.html Did not have those 7 segment displays, considered an LCD interface, but why not use RS232, and power it from the RS232 too? Just a probe you can bring along with your laptop, saves weight :-) So.. modified that code a bit:-) This is what the output looks like: ftp...


rs232 interupt on old ibm pc type machines

Started by Hul Tytus in sci.electronics.design4 years ago 3 replies

sci.electronics.design rs232 interupt on old ibm pc type machines Below are an rs232 initialization and a handler routine that work well on...

sci.electronics.design rs232 interupt on old ibm pc type machines Below are an rs232 initialization and a handler routine that work well on later vintage ibm pc types, roughly 200 mc and above. The AT vintage types however are a bust. The 8250 registers and the interupt mask register in the interupt controller appear as expected in both cases. Anyone have an idea what is missing f...


Steps to program P89V51RD2 by ISP method using RS232

Started by Srinivas Nayak in sci.electronics.design5 years ago

After long discussions and try, I was able to successfully able to program = P89V51RD2 by In Situ Programming (ISP) method using RS232. In a hope...

After long discussions and try, I was able to successfully able to program = P89V51RD2 by In Situ Programming (ISP) method using RS232. In a hope that i= t shall be useful to other members, I would like to post my experience with= simple steps. For my success, I shall thank all our friends, who have help= ed me clearing my doubts and have provided their help and suggestions.=20 Here are th...


Looking for simple way to interface BCD to serial (RS232)

Started by RFI-EMI-GUY in sci.electronics.design8 years ago 51 replies

I have a device that has a three digit LED display. The chip that drives the LED also has four Binary Weighted outputs (1,2,4,8) and three...

I have a device that has a three digit LED display. The chip that drives the LED also has four Binary Weighted outputs (1,2,4,8) and three address pins for 100's, 10's and units. I want to drive a FIFO UART of some sort to output an RS232 stream so that this device can update a software program. Baud rate 300 to 4800 range would be nice if possible. The updates are about 300/second I...


USB to Serial adaptor

Started by Oppie in sci.electronics.design4 years ago 41 replies

Does anybody have a favorite USB to RS-232 adaptor that they can recommend? Evidently some are not created equal and have had some issues. A...

Does anybody have a favorite USB to RS-232 adaptor that they can recommend? Evidently some are not created equal and have had some issues. A colleague in France reported that he had found some discrepancies in how the grounding was accomplished: "It appears that the RS232 plug body is NOT always bound to USB plug body, nor to the pin 5 (ground) of the rs232 plug, so that finally there...


A cheap very accurate LC meter with RS232 interface

Started by Jan Panteltje in sci.electronics.design7 years ago 26 replies

A cheap ( < 10 $) very accurate LC meter with RS232 interface. http://panteltje.com/panteltje/pic/lc_pic/ All credit goes to somebody else...

A cheap ( < 10 $) very accurate LC meter with RS232 interface. http://panteltje.com/panteltje/pic/lc_pic/ All credit goes to somebody else (actually a lot of people) for this design. I merely simplified it some more :-) It seems to be very accurate, and is most useful if you are winding your own inductors or working with RF and extremely small capacitors, a few pF is no problem for this.


Instrument with analog output, cheap and on RS232/USB

Started by Klaus Kragelund in sci.electronics.design5 years ago 12 replies

Hi For a test setup I often need an analog signal to feed into the device under test. So I need a instrument with an anlog output. It needs...

Hi For a test setup I often need an analog signal to feed into the device under test. So I need a instrument with an anlog output. It needs to run on RS232 or USB I could roll my own, with a eval board, but have no time to spend on that Anyone know of a cheap model (no the National Instruments, NIDaqs, they are prohibitive expensive) Thanks Klaus


Ground currents blowing up my CM choke

Started by Allan Herriman in sci.electronics.design6 years ago 58 replies

Hi, I recently designed a product with an RS232 port on it. I put a common mode choke on the ground and data lines to reduce EMI. Two...

Hi, I recently designed a product with an RS232 port on it. I put a common mode choke on the ground and data lines to reduce EMI. Two ground lines, Tx data and Rx data go through the choke. The choke I chose was a tiny eight terminal 0805 thing with an 80mA rating. At the time I thought that would be adequate for RS232, but we've managed to destroy a number of them through regul...


GPS frequency counter + PLL PIC based

Started by Jan Panteltje in sci.electronics.design5 years ago 1 reply

To 'stabilize' the frequency from the 'twisted' wire oscillator as described in previous posts, and to be able to set it via RS232 and read it, I...

To 'stabilize' the frequency from the 'twisted' wire oscillator as described in previous posts, and to be able to set it via RS232 and read it, I wrote some PIC 18F14K22 asm and added a simple 2 line LCD. The first line shows the requested frequency ,as typed in via RS232. The bottom line shows the measured frequency (against a 10 MHz xtal). http://panteltje.com/pub/GPG_freq_counter_PLL_IMG_...


SPI to RS232 Conversion

Started by Artist in sci.electronics.design8 years ago 25 replies

I want to use the MAX9939, http://datasheets.maxim-ic.com/en/ds/MAX9939.pdf, on a board with no uP and control it instead with an RS232 serial...

I want to use the MAX9939, http://datasheets.maxim-ic.com/en/ds/MAX9939.pdf, on a board with no uP and control it instead with an RS232 serial port from a PC. I thought at first I could do this with the MAX3110E: http://datasheets.maxim-ic.com/en/ds/MAX3110E-MAX3111E.pdf but after reading this spec sheet I notice that on both the MAX3110E and the MAX9939 the SCLK line is an input. Evidentl...


Chassis Ground layout for better ESD and EMI compliance

Started by Mark in sci.electronics.design6 years ago 82 replies

I have 2 USB, 2 Ehthernet and 2 RS232 connectors on the PCB. USB conns are one side, Ethernet conns on the 2nd side and RS232 on the 3rd side of...

I have 2 USB, 2 Ehthernet and 2 RS232 connectors on the PCB. USB conns are one side, Ethernet conns on the 2nd side and RS232 on the 3rd side of the board. All are through hole connectors and on top layer with separate chassis ground area on each side for connectors shields. So I have three chassis ground islands on th board for three sets of these connectors. If we have to connect the chassi...


fm_pic, a small RS232 controlled FM stereo transmitter with LCD display.

Started by Jan Panteltje in sci.electronics.design7 years ago 24 replies

fm_pic, a small RS232 controlled FM stereo transmitter with LCD display. This design uses a BH1415F based FM transmitter module from ebay. ...

fm_pic, a small RS232 controlled FM stereo transmitter with LCD display. This design uses a BH1415F based FM transmitter module from ebay. http://panteltje.com/panteltje/pic/fm_pic/


Wow 460800 Bd via USB to serial adaptor works!

Started by Jan Panteltje in sci.electronics.design5 years ago 1 reply

Wow 460800 Bd via USB to serial adaptor works! Wanted to add a par port to my laptop, or at least some I/O pins. At 460800 Bd you can send a...

Wow 460800 Bd via USB to serial adaptor works! Wanted to add a par port to my laptop, or at least some I/O pins. At 460800 Bd you can send a byte in 2.17 uS. That means if I want to test I2C chips via USB to RS232 adaptor, and use only one state flip per bit, something that requires 4 bytes RS232 per I2C bit processing, for example: SDA high SCL high SCL low SDA low makes 10.8 ...


An other PIC project: Add 8 analog 10 bit inputs, 2 digital inputs, 5 digital outputs, 1 PWM to your PC via RS232, for < 10$

Started by Jan Panteltje in sci.electronics.design10 years ago 11 replies

An other PIC project: Add 8 analog 10 bit inputs, 2 digital inputs, 5 digital outputs, 1 PWM to your PC via RS232 And all that for less then...

An other PIC project: Add 8 analog 10 bit inputs, 2 digital inputs, 5 digital outputs, 1 PWM to your PC via RS232 And all that for less then 10$ OK: http://panteltje.com/panteltje/pic/io_pic/index.html Just some asm code to add some decent IO to your PC.


Why are people buying old Picstart Programmers?

Started by Anonymous in sci.electronics.design5 months ago 24 replies

I was perusing eBay recently and noticed these old Picstart Programmers going for about $50. Why???!! With an RS232 port and I'm sure limited...

I was perusing eBay recently and noticed these old Picstart Programmers going for about $50. Why???!! With an RS232 port and I'm sure limited capability, the only theory I have is as collector's items.


Real Time Clock Code (RTC) for PIC family

Started by tomcee in sci.electronics.design7 years ago 50 replies

Hello: What is the latest RTC code anyone could recommend for the PIC (16f) family? My requirements are simplicity and low power, with LCD...

Hello: What is the latest RTC code anyone could recommend for the PIC (16f) family? My requirements are simplicity and low power, with LCD display and perhaps RS232 interface. Is the Microchip AN582 as good as it gets? Thanks, TomC


C8051F330 serial port programmer

Started by Anonymous in sci.electronics.design9 years ago 5 replies

hey folks how to build a simple serial port (rs232) programmer to burn the C8051F330 by silicon lab? I built programmer for TI...

hey folks how to build a simple serial port (rs232) programmer to burn the C8051F330 by silicon lab? I built programmer for TI microcontrollers but this is 1st time to use C8051F uC. Thanks.