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Author Topic: help me about RS232 as supply..  (Read 1367 times)

Offline kutonglupa

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help me about RS232 as supply..
« on: March 02, 2009, 11:53:14 PM »
pano ko po gagawing supply ung RS232 ko? gus2 ko sana makakuha ng 5V DC sa RS232 para sa circuit ko. pano po gawin un? may links po ba kau na maiibigay? ano po ang schematic nun?
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help me about RS232 as supply..
« on: March 02, 2009, 11:53:14 PM »

Offline marcelino

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Re: help me about RS232 as supply..
« Reply #1 on: March 03, 2009, 12:06:04 AM »
i suggest sa USB ka nalang kumuha... though, it could only supply up to 500mA (per port).

it is not that good to get a supply on serial. you would still be needing a transceiver for that (max232 or transistor equivalent).
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Re: help me about RS232 as supply..
« Reply #1 on: March 03, 2009, 12:06:04 AM »

Offline kutonglupa

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Re: help me about RS232 as supply..
« Reply #2 on: March 03, 2009, 12:18:41 AM »
i have a max232 connected.
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Re: help me about RS232 as supply..
« Reply #2 on: March 03, 2009, 12:18:41 AM »

Offline marcelino

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Re: help me about RS232 as supply..
« Reply #3 on: March 03, 2009, 12:29:09 AM »
Quote from: kutonglupa on March 03, 2009, 12:18:41 AM
i have a max232 connected.

then hit it...

be careful not to have a short on the pins. it could permanently damage your serial port!
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Re: help me about RS232 as supply..
« Reply #3 on: March 03, 2009, 12:29:09 AM »

Offline kutonglupa

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Re: help me about RS232 as supply..
« Reply #4 on: March 03, 2009, 12:40:43 AM »
ahm.. i dont know what will be the circuit like..
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Re: help me about RS232 as supply..
« Reply #4 on: March 03, 2009, 12:40:43 AM »

Offline marcelino

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Re: help me about RS232 as supply..
« Reply #5 on: March 03, 2009, 12:51:19 AM »
ganito kasi yan....

most pins in your serial ports like pins 3 and 4 (8 and 9, i guess, and i am not sure with the direction) gives off around -11V. kapag pinadaan mo yan sa max232 magiging 5V yan...

pero, saan ka kukuha ng supply na 5V para sa max232 mo?

the easiest way is using your USB.
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Offline kutonglupa

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Re: help me about RS232 as supply..
« Reply #6 on: March 03, 2009, 12:58:40 AM »
ahhh.. ibig po sabihin hiwalay talaga ang supply ko para sa max232. d pla pede na ung rs232 ang magbibigay supply sa circuit gaya ng sa usb?
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Offline marcelino

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Re: help me about RS232 as supply..
« Reply #7 on: March 03, 2009, 01:01:12 AM »
Quote from: kutonglupa on March 03, 2009, 12:58:40 AM
ahhh.. ibig po sabihin hiwalay talaga ang supply ko para sa max232. d pla pede na ung rs232 ang magbibigay supply sa circuit gaya ng sa usb?

ganyan talga yan...
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Offline maldihtah13

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Re: help me about RS232 as supply..
« Reply #8 on: March 03, 2009, 10:20:57 AM »
I did a RS232 to TTL converter pra sa mga projects ko pero sa serial port ko lang kinuha yung power. Kung tama ang memory ko sa RTS ko kinuha ang power. Kaya kung gagamitin ko sya sa serial interface dapat mo muna i high ang RTS pra magkapower sya.
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Offline paranz

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Re: help me about RS232 as supply..
« Reply #9 on: March 03, 2009, 02:51:28 PM »

from google...


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Offline marcelino

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Re: help me about RS232 as supply..
« Reply #10 on: March 03, 2009, 03:27:43 PM »
Quote from: parans on March 03, 2009, 02:51:28 PM
from google...




papano natin iseset ng high ang RTS?
di ba by default low yan (-11.XX, just measured it. heheh )
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Offline marcelino

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Re: help me about RS232 as supply..
« Reply #11 on: March 03, 2009, 03:40:35 PM »
i traced your image sis parans, got it here: http://www.epanorama.net/circuits/rspower.html

mababa lang pala ang pwedeng makuha. typical of 10mA lang. pero di ko pa din makuha kung papano iseset high ang DTR/RTS as high.


@kutonglupa, sorry pwde pala.

pero i still insist of pushing you using USB. heheheh :D
10mA, pang LED lang yan eh. :)
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Offline maldihtah13

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Re: help me about RS232 as supply..
« Reply #12 on: March 03, 2009, 04:50:34 PM »
Kung sarili mong program (for example sa VB) iseset mo lang sya high (tama ba?) memory gap na eh
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Offline marcelino

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Re: help me about RS232 as supply..
« Reply #13 on: March 03, 2009, 04:52:08 PM »
Quote from: maldihtah13 on March 03, 2009, 04:50:34 PM
Kung sarili mong program (for example sa VB) iseset mo lang sya high (tama ba?) memory gap na eh

tama, as i suspected, software ang magpapaON.
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Offline SpongeBob

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Re: help me about RS232 as supply..
« Reply #14 on: March 03, 2009, 04:55:53 PM »
Quote from: kutonglupa on March 03, 2009, 12:18:41 AM
i have a max232 connected.

kung kailangan mo ng 5 volts para sa MAX232 wag mo na yan gamitin, gumamit ka na lang ng transistors as RS232 level converter
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Offline marcelino

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Re: help me about RS232 as supply..
« Reply #15 on: March 03, 2009, 04:57:43 PM »
Quote from: robasimo on March 03, 2009, 04:55:53 PM
kung kailangan mo ng 5 volts para sa MAX232 wag mo na yan gamitin, gumamit ka na lang ng transistors as RS232 level converter

sir rob, sufficient na kaya para dun sa dalawang transistor ang 10mA. yun ang winoworry ko sa strategy na  to.
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Offline kennarionwong

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Re: help me about RS232 as supply..
« Reply #16 on: March 14, 2009, 10:59:03 PM »
bridge diode lng katapat nyan sa GND at TXD tps lagyan mo ng 7805 volt reg para maregulate yung RS232 level voltage.... meron ka na +5V supply.
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Re: help me about RS232 as supply..
« Reply #16 on: March 14, 2009, 10:59:03 PM »
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