SM501_DC_PANEL_CONTROL_BIAS
control &= ~SM501_DC_PANEL_CONTROL_BIAS;
control |= SM501_DC_PANEL_CONTROL_BIAS;
control |= SM501_DC_PANEL_CONTROL_BIAS;
control &= ~SM501_DC_PANEL_CONTROL_BIAS;
SM501_DC_PANEL_CONTROL_BIAS |