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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
What do you mean by connected through a USB connector?
Also, how are you powering the slaves? If you have them plugged into a PC via USB then the console will automatically move to USB, so they won't respond on serial.
A single 4k7 pullup should be fine though. You need to be careful that all slaves are running that code - if just one isn't in
pinMode(B6, 'af_opendrain');then it'll stop the transmission of the others