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

Started by Jan Panteltje in sci.electronics.design6 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.design6 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...


rs232 interupt on old ibm pc type machines

Started by Hul Tytus in sci.electronics.design7 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...


poking rs232 port BMS

Started by legg in sci.electronics.design8 months ago 13 replies

I've got a battery management unit that is reluctant to demonstrate functionality. The vendor's terminal com software seems non-functional...

I've got a battery management unit that is reluctant to demonstrate functionality. The vendor's terminal com software seems non-functional (will not install). So far the only evidence of life is a control line (one of three) hard on, and rare /XFFE /FFF signalled outputs on the rs232 port. Internal DC-DC fails to power LEM sensor. Balancing terminals seem inactive. Can anyone recom...


USB to Serial adaptor

Started by Oppie in sci.electronics.design7 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...


Instrument with analog output, cheap and on RS232/USB

Started by Klaus Kragelund in sci.electronics.design8 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.design9 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.design8 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_...


Wow 460800 Bd via USB to serial adaptor works!

Started by Jan Panteltje in sci.electronics.design8 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 ...


Why are people buying old Picstart Programmers?

Started by Anonymous in sci.electronics.design3 years 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.


used computer

Started by Hul Tytus in sci.electronics.design4 years ago 37 replies

sci.electronics.design source for used computers Can anyone suggest a source for used computers? I'm looking for a few Intel based...

sci.electronics.design source for used computers Can anyone suggest a source for used computers? I'm looking for a few Intel based desktop machines with a processor clock rate about or above 500 mc, hard disk, parallel port, rs232 port, and vga output for about $100 or less. Google showed about six dealers, presumably their advertizers, and nothing more. Bing did about the same. ...


USB -> Serial/RS232 Convertors

Started by tomcee in sci.electronics.design9 years ago 8 replies

What is the recommended USB -> Serial convertor for usage with the latest Win7/64bit OS? In the past, I've been pleased with the performance...

What is the recommended USB -> Serial convertor for usage with the latest Win7/64bit OS? In the past, I've been pleased with the performance of a Belkin device as it had RX/TX indicators and drivers were immediately available. Now I find that this device is not supported by the manufacturer with Win7/64. Thank you in advance for your advice, TomC


TX <--> TX. Did it again

Started by Tim Wescott in sci.electronics.design5 years ago 21 replies

Argh. So, I think I manage to get the UART outie hooked up to the USB and/or RS232 converter outie (and innie to innie) well over half the...

Argh. So, I think I manage to get the UART outie hooked up to the USB and/or RS232 converter outie (and innie to innie) well over half the time. And, I just did it again. The STM32F303 has a SWAP bit in its UART configuration, to swap the TX and RX pins, but that would be cheating (and besides, I did it with RTS/CTS as well). C'mon. Say that _you_ get it right all the time! -- ...


Thuraya XT satphone - what USB chip is used?

Started by John-Smith in sci.electronics.design6 years ago 19 replies

I am trying to make it work under win8... It isn't a Prolific 2303 and it isn't an FTDI FT232 or similar... Win8 does notice it was plugged...

I am trying to make it work under win8... It isn't a Prolific 2303 and it isn't an FTDI FT232 or similar... Win8 does notice it was plugged in (it beeps) but nothing new (that I can see) appears under Control Panel / Devices. I would expect a COM port with a Hayes compatible modem behind it. That is what their older models do. The old 7100 is a straight RS232 Hayes modem, but the XT is...


2.5 digit bcd to 8 bit encoding?

Started by N_Cook in sci.electronics.design6 years ago 53 replies

So 0.00 to 3.99 to 8bit and then via simple 8bit RS232. The data is well behaved , just going up or down slowly. As limited to hardware...

So 0.00 to 3.99 to 8bit and then via simple 8bit RS232. The data is well behaved , just going up or down slowly. As limited to hardware conversion/encoding at the sensor end (pc at the other so no decoding limitation there), thinking Send as packed BCD of the tenths and hundredths and then hardware encode onto MSB only when it is 1001 "9", the units 0to 3 reading as 2bit binary on the D6...


High speed (230K) RS232 drivers?

Started by linnix in sci.electronics.design9 years ago 50 replies

Gee Wee, the customer is not happy with 115K. We already determined that TI's MAX232 works up to 115K and the MAX3232 won't even work at 115K...

Gee Wee, the customer is not happy with 115K. We already determined that TI's MAX232 works up to 115K and the MAX3232 won't even work at 115K (although it claims to work). I know there are pin-incompatible MAX-something, but we don't want to change layout, just for the sake of in-compatibility. Are there pin-compatible, reliable MAX232 clones for 230K that work, not just claim to work? Th...


Testing the Dealextreme ET411 GPS module

Started by Jan Panteltje in sci.electronics.design8 years ago 12 replies

Ordered the Dealextreme GPS module about a week?? ago, came really fast, made a small test board: ...

Ordered the Dealextreme GPS module about a week?? ago, came really fast, made a small test board: http://panteltje.com/pub/testing_dealextreme_E411_GPS_module_IMG_3501.png That little pink thing with the red LED is the module. It says RS232, but really is only 3V logic level in and out, so I added a 7805 for its 5V supply, and a MAX232 (on the back): http://panteltje.com/pub/GPS_test_board...


RS232 decode routines from raw scope data?

Started by Joerg in sci.electronics.design1 year ago 76 replies

Is there a simple Windows or Linux program that can decode serial data out of raw data from an digital oscilloscope? My old logic analyzer...

Is there a simple Windows or Linux program that can decode serial data out of raw data from an digital oscilloscope? My old logic analyzer does not have any serial data decoding and neither does my scope. So I'd need something that can take in the ADC raw data, I set a threshold to turn that into H/L digital values and the software would fish out the data words. Not sure if it even exis...


Looking for a DDS module 10kHz-1MHz, 2Vrms sine into 50ohms

Started by Joerg in sci.electronics.design7 years ago 18 replies

For a tester project I need a DDS source, should be a module but with some decent output power and if possible a display. SPI or RS232...

For a tester project I need a DDS source, should be a module but with some decent output power and if possible a display. SPI or RS232 style control would be nice. So far I only found this kind: http://www.amazon.com/SG1005-Signal-Generator-Source-Function/dp/B008N7M5KU/ref=sr_1_1?ie=UTF8&q id=1359855256&sr=8-1&keywords=SG1005+DDS Some comments are not so enthusing though: http://www.elecf


Released some simple Linux PCcommand line program to take care of prescalers for the freq_pic project

Started by Jan Panteltje in sci.electronics.design8 years ago 1 reply

Released some simple Linux PC command line program to take care of prescalers for the freq_pic project. when experimenting with all different...

Released some simple Linux PC command line program to take care of prescalers for the freq_pic project. when experimenting with all different prescalers connected to the PIC RS232 frequency counter, it sort of seemed useful to be able to add any multipliers on the command line: http://panteltje.com/panteltje/newsflex/download.html#freq256 So, for example one can now, in case of a 1:8 an...