any? using transistors...
i just get one, but dont work smoothly. sometimes work, sometimes not. speed issue??
i just get one, but dont work smoothly. sometimes work, sometimes not. speed issue??
here there's a diagram
http://images.google.it/imgres?imgurl=www.nutchip.com/interfacce/interface_max232.gif&imgrefurl=http://www.nutchip.com/interfacce/interfaccia.htm&h=317&w=612&sz=5&tbnid=E1drNxisyXUJ:&tbnh=69&tbnw=133&prev=/images%3Fq%3Dmax232%26svnum%3D10%26hl%3Dit%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26sa%3DG
but it should work only in TX and RX don't come at same time.
this site show also a more complete diagram but i can't understand the site language :).
http://218.7.17.204/mcu1/3/205.gif
http://images.google.it/imgres?imgurl=www.nutchip.com/interfacce/interface_max232.gif&imgrefurl=http://www.nutchip.com/interfacce/interfaccia.htm&h=317&w=612&sz=5&tbnid=E1drNxisyXUJ:&tbnh=69&tbnw=133&prev=/images%3Fq%3Dmax232%26svnum%3D10%26hl%3Dit%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26sa%3DG
but it should work only in TX and RX don't come at same time.
this site show also a more complete diagram but i can't understand the site language :).
http://218.7.17.204/mcu1/3/205.gif
The easiest thing to do is use two gates from a 74HCT14, or similar.
One gate drives the TxD line with 330 ohm in series with its output.
The RxD line goes to the input of the other gate through a 100 kohm resistor.
This kind of driver will only give you a 0 to 5V signal, but it will communicate with any modern computer. The receiver will also communicate with anything.
One gate drives the TxD line with 330 ohm in series with its output.
The RxD line goes to the input of the other gate through a 100 kohm resistor.
This kind of driver will only give you a 0 to 5V signal, but it will communicate with any modern computer. The receiver will also communicate with anything.
Stay with the 232. The max242 or 312 may also fit.
Both devices have charge pumps to convert the H/L to -7/+7V.
Sipex also makes compatible parts.
You should be able to order samples from www.maxim.com
Both devices have charge pumps to convert the H/L to -7/+7V.
Sipex also makes compatible parts.
You should be able to order samples from www.maxim.com
This kind of driver will only give you a 0 to 5V signal, but it will communicate with any modern computer. The receiver will also communicate with anything.
how modern is it? any referal?
That will work with any computer built in the last five years or so. Try it.
It's very important to use CMOS gates and it's also important to have a resistor (100k) between the RxD line and the input of the gate.
It's also a good idea to have a 330 ohm resistor between the output of the TX gate to the TxD line.
I have not encounterd a situation where it did not work.
It's very important to use CMOS gates and it's also important to have a resistor (100k) between the RxD line and the input of the gate.
It's also a good idea to have a 330 ohm resistor between the output of the TX gate to the TxD line.
I have not encounterd a situation where it did not work.