First Virtual Communications 3000 user manual EMU Switch Settings, ID settings for the EMU

Voyager 3000 User Guide

Table 3-1 EMU Switch Settings

Switch	Signal Name	Description	Default Setting
SW1	ID2	Address Bit 2	Setting is
SW2	ID1	Address Bit 1	position
SW3	ID0	Address Bit 0	dependent
SW4	Sync	Spindle Sync	Off
SW5	DLYSEN	Drive Spinup Enable	On
SW6	DLYSON	Drive Spinup Delay	Off
SW7	Term Pwr 1	Termination Power	On
		Enable Bus One
SW8	Term Pwr 1	Termination Power	On
		Enable Bus Two

SW1àSW3 are used to set the I2C bus ID. A device with address 0 is designated as the master. Any other ID caused the EMU to appear as a slave device. Table 3-2 lists the ID setting for the EMU.

Table 3-2 ID settings for the EMU

SW1	SW2	SW3	EMU ID
Off	Off	Off	0 (Master)
Off	Off	On	1
Off	On	Off	2
Off	On	On	3
On	Off	Off	4
On	Off	On	5
On	On	Off	6
On	On	On	7

SW4 is used to enable drive spindle synchronization.

SW5 and SW6 are used to control drive spinup sequencing.

If SW6 is set off then SW5 will control drive sequencing. If SW5 is off then power up sequencing is disabled. If SW5 is set to on then power up sequencing will be enabled if only one PSU is available10 otherwise no power sequencing will occur.

If SW6 is on then delayed power sequencing will always occur regardless of the setting of SW5. Table 3-3 summarizes these signals

10This situation may occur if a PSU has failed or the system has been set up with only one PSU configured.

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