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RB834 box with EPrime & Accessory connector

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  • RB834 box with EPrime & Accessory connector

    I have successfully configured the RB-834 box to work with E_Prime but want to monitor the button press signals that are output from the Accessory connector. This is to test timing accuracy using BBTK. I have monitored these signals and the output pins (AC1-6) are permanently at +5v; i.e. they do not respond to button presses. Can you please explain what might be happening? I would also like a wiring diagram of the RB-834 box if possible so that I can monitor the button from another point in the circuit. Can you provide this?

  • #2
    Hi Chris,

    Unless you have changed the response pad's configuration by sending XID commands (as described at, the RB-834 should automatically provide signals on the Accessory Connector for six of the eight buttons, as shown on this page:

    However, the output is "active low", meaning that when nothing is pressed the lines will be at +5V, and they'll go to ground when you press key.

    Regarding the wiring diagram, I cannot unfortunately provide this. But if you open the box (standard disclaimers apply, of course!), you will find a set of "pads" on the circuit boards that connect directly to the buttons. I don't recall what this set is labeled (I'm at home), but I can look it up if it's not obvious.