Granite Devices Simucube 2 Accessory port Application Manual page 3

Warnings and Guidelines for Safe Operation
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The Simucube Accessory port is a female D15 connector on the back of the device.
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The signal levels are from 0 to 5 Volts.
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Do not connect any unknown devices to this connector.
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The port is not a serial port connector although the mechanical connector is the same as
a 15-pin serial port.