RS422 RJ45 loopback cable

Oct 20, 2006 3 Replies
M

I created an RS422 RJ45 loopback cable by connecting pin 1 to pin 8 and pin 4 to pin 5.



I also connected a few of the other pins that aren't used since it made it easier to line everything up into an RJ45 plug.



However, when I type a letter, it appears twice. For instance, if I type ABC, this shows up:



AABBCC



At first, I thought local echo was enabled. However, I checked, and it's disabled.



Any ideas why I'm seeing double?



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D

has to be a software setting. you transmit it once, you receive it once. if it isn't local echo, it has to be something else in your software. can you hardware monitor the RX line only on a different machine?

Don...

Don McKenzie E-Mail Contact Page: http://www.dontronics.com/e-mail.html Micro,TTL,USB to 1.5" color LCD http://www.dontronics.com/micro-lcd.html USB,RS232 or TTL to VGA Monitor http://www.dontronics.com/micro-vga.html World\'s smallest USB 2 TTL Conv http://www.dontronics.com/micro-usb.html
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B

My software has a setting, something like "Echo Typed Characters Locally" with a checkbox to enable, and if enabled I get double characters like you describe. HTH Bart

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R

Check for a half-duplex/full-duplex setting.

Good Luck! Rich

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