# Confused: Can a WRLWRL-00582 BlueSMiRF direct connect to...

**URL:** <https://community.sparkfun.com/t/confused-can-a-wrlwrl-00582-bluesmirf-direct-connect-to/3951>\
**Category:** Wireless & IoT\
**Created:** [March 20, 2007, 10:54pm UTC](https://community.sparkfun.com/t/confused-can-a-wrlwrl-00582-bluesmirf-direct-connect-to/3951 "2007-03-20T22:54:12Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![onad](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@onad](https://community.sparkfun.com/u/onad)\
**Post date:** [March 20, 2007, 10:54pm UTC](https://community.sparkfun.com/t/confused-can-a-wrlwrl-00582-bluesmirf-direct-connect-to/3951/1 "2007-03-20T22:54:12Z")

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I’m somehow confused :?

Can a WRLWRL-00582 BlueSMiRF **directly** RX/TX connect to and small RS232 device if, ofcourse, I provide it 5v also? The device to connect to still has the sizy 9pin connector byt I will desoldert this.

It is not that the OTHER SFE BlueDongle RS232 Bluetooth Modem pricetag put me ($59 to $69) off, but more, I rather not want and need a big antenna and sizey 9 pin connector if possible to avoid I rather use the small Blusmirf module. The Sparkfun product description states:

“The remote unit can be powered from 3V up to 6V for easy battery attachment. All signal pins on the remote unit are 3V-6V tolerant. No level shifting is required.”

Can anyone enleighten me please ? That would be really appriciated.

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**Author:** ![busonerd](https://avatars.discourse-cdn.com/v4/letter/b/958977/32.png) [@busonerd](https://community.sparkfun.com/u/busonerd)\
**Post date:** [March 21, 2007, 3:54pm UTC](https://community.sparkfun.com/t/confused-can-a-wrlwrl-00582-bluesmirf-direct-connect-to/3951/2 "2007-03-21T15:54:57Z")

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RS232 is a different serial level:-9 → +9.

If you want a bluesmirf to talk those voltage levels, you need a level shifter. We sell one on the bigger board, but you can use a max232 chip if you want a smaller sized solution.

Cheers,

–David Carne

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**Author:** ![onad](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@onad](https://community.sparkfun.com/u/onad)\
**Post date:** [March 21, 2007, 4:28pm UTC](https://community.sparkfun.com/t/confused-can-a-wrlwrl-00582-bluesmirf-direct-connect-to/3951/3 "2007-03-21T16:28:22Z")

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Thanks, my confusion is gone! I will actually order both solutions to experiment with.