# RCI Protocol

**URL:** <https://forums.digi.com/t/rci-protocol/4048>\
**Category:** Plug N' Play\
**Tags:** hardware\
**Created:** [August 4, 2005, 8:31pm UTC](https://forums.digi.com/t/rci-protocol/4048 "2005-08-04T20:31:37Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![frank](https://avatars.discourse-cdn.com/v4/letter/f/3d9bf3/32.png) [@frank](https://forums.digi.com/u/frank)\
**Post date:** [August 4, 2005, 8:31pm UTC](https://forums.digi.com/t/rci-protocol/4048/1 "2005-08-04T20:31:37Z")

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Hi,

I have the lastest Digi Connect ME on my eval board.

I have a raw TCP connection on port 502

I connected to this port on the Connect ME successfully

The problem is,

I lower the DSR to activate the RCI port.

I then send the following via the serial port

I get the full response back from the Connect ME - no problem

However, now my TCP raw port does not work anymore - will not connect no matter what state DSR is in or whether I completely reboot the system - power removed etc.

The only way to get arround this TCP raw port “lockout” is to launch the browser and reset the Connect ME to factory defaults.

Why does a simple RCI query lock me out of my TCP raw port and why does it only start working again after reseting to factory defaults?

Frank