How to Disable Serial Echo on BS2?

ScottsBots

Hi,

I have a Mini-SSC with a shared serial connection as my BS2. Because the BS2 echo's all bytes sent these get stored in the receive buffer of my PC, when I then go to receive actual data from my BS2, i.e. read compass, I get a bunch of garbage (queued serial xmits to SSC).

I would really like to disable the serial echo on 16 so that it does not echo what's sent back to my PC.

How can I do this?

Chris Savage

Hello,

·· You cannot disable the echo. There is literally a 4.7K resistor between the S_IN and S_OUT pins. On your PC Application you need to filter what you send prior to receiving responses. Take care.

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Chris Savage
Parallax Tech Support

allanlane5

And if you removed the 4.7 KOhm resistor you wouldn't be able to program it, nor recieve data from it, as the 'RX' line back to the PC uses the 'TX' line's voltage.

You COULD add an inexpensive MAX232 circuit and use two other pins on the BS2 -- that would defeat the 'echo' problem.

Phil Pilgrim (PhiPi)

If this is a critical need, you might consider the MoBoStamp-pe instead of a BS2. It has a port pin that can gate the echo on and off.

-Phil