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Author Topic: RS232 to RS485 converter  (Read 1036 times)
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Ljmnunes
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« on: February 04, 2021, 04:18:50 16:18 »

Hello, everybody!

This was my best friend for many years.

This week I decided to make an upgrade and make a new pcb now in SMT.

To use it with speed other than 9600 bps you need to recalculate the 555 time constant.

It was redraw in Kicad.

Enjoy!
« Last Edit: March 13, 2021, 12:04:08 00:04 by Ljmnunes » Logged

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metal
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« Reply #1 on: February 04, 2021, 07:42:09 19:42 »

seems you forgot to put edge cuts Smiley
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Ljmnunes
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« Reply #2 on: February 04, 2021, 10:55:15 22:55 »

Oooops... Sorry.  Grin

I've used PCAD for years. Today I'm retired and playing sometimes with Kicad. I'm sure I'll do more mistakes with him. Tongue
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metal
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« Reply #3 on: February 04, 2021, 11:22:11 23:22 »

yea, PCAD is another world.
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sadman
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« Reply #4 on: February 05, 2021, 01:26:44 13:26 »

Kello, everybody!

This was my best friend for many years.

This week I decided to make an upgrade and make a new pcb now in SMT.

To use it with speed other than 9600 bps you need to recalculate the 555 time constant.

It was redraw in Kicad.

Enjoy!


kindly also share pdf converted for schematic and PCB thanks
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Ljmnunes
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« Reply #5 on: February 05, 2021, 08:57:17 20:57 »

kindly also share pdf converted for schematic and PCB thanks

No problems! It is attached here.
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techneo
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« Reply #6 on: February 08, 2021, 04:42:22 04:42 »

Kello, everybody!

This was my best friend for many years.

This week I decided to make an upgrade and make a new pcb now in SMT.

To use it with speed other than 9600 bps you need to recalculate the 555 time constant.

It was redraw in Kicad.

Enjoy!


Hi,
  this is a great idea. In fact,  i have already made one using Max491. Although i plan to upgrade the design using a number of other controller including some from Maxlinear SP338 and Analog Device ADM3068. The best part is that it has a baud rate of greater than 5 MBPS for transferring large data files.

 - techNeo
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Ljmnunes
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« Reply #7 on: February 08, 2021, 11:56:12 11:56 »

Hi,
  this is a great idea. In fact,  i have already made one using Max491. Although i plan to upgrade the design using a number of other controller including some from Maxlinear SP338 and Analog Device ADM3068. The best part is that it has a baud rate of greater than 5 MBPS for transferring large data files.

 - techNeo

Thank you!

I remember that I did make this project urgentely and coud't wait for new components. So I take a look arround and found theses three components.

So, I did the first version of this project in dead bug style... I used it for a couple days. Soon I did make a little PCB and put the jumpers because I had some troubles with correct DB9 connection and RS485 biasing.

I've used it in bare pcb for years intill I be retired.
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