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3.6.8
Controlling
by
the Basic Drive Select Signal
Even when the relevant drives are not selected, the four basic signals (such as,
INDEX, DRIVE READY, SECTOR/BYTE CLOCK and SEEK COMPLETE) can be
sent to the interface cable (both A and B). The method of sending these signals is
shown in Table 3.9 and Fig. 3.15.
Table 3.9 Drive Selection Control
SW3
Cable A
Kev2
Gate
0
Does not gate
X
SW3 (Mounting Location B6)
Key
2
Key
3
SW3
Cable B
Key 3
Gate
0
Does not gate
X
I n the example at the left. cable A is
gated and cable B is not gated.
Fig. 3.15 Drive Selection Control.
3.6.9
Time Margin Measurement Switch
O:ON
X: OFF
This is a switch for measuring time margins. Set this switch to OFF only when
measuring margins.
SW2 (Mounting Location T4)
OFF
ON
I~
___ •
4
Key
4
The switch is usually set to the position
shown at the left.
Fig. 3.16 Time Margin Measurement Switch
3.6.10 Input Negative Voltage Selection
The drive requires -5V input but has the capability of regulating higher negative
voltage (-7V to -16V) into suitable one (-5V). Such voltage value selection con-
figurations are described below.
2
3
51
1t9:@
0
When input vo Itage is -5V.
51
I
0
I§/@
I
When input voltage is -7V - -16V.
3-14
B03P-4605-0003A .... B
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