Specifications

The sJgna11nterface consists of three categories:
a. Control Input
Una
b. Control Output Una
c. Data Transfer Una
AD control lines are digitalin nature and either provide signals to the drive (input) or provide signals to the host (out-
I
put) via the interface connector JS/P5. The data transfer slgnall are differentialln nature. They provide data either
to or from the drive. via J6/P6. See figure 2-2 for the J6/P6 pin assignments.
HOST
706n12
-
DRIVE SELECTED
1
-
GND
2
SPARE
3
GND
~
SPARE
5
GNO
8
J6/Pe
RESERVED
7
GND
8
SPARE
,
FLAT CABLE
GND
10
20 FT MAX
GND
'1
(8.6 mm)
GND 12
+ MFM WRITE DATA
13
-MFM WRITE DATA
-
GND
-
, ..
15
GND
16
-
+ MFM READ DATA
17
-
-MFM READ DATA
-
18
-
GNO
19
GND
20
--:
- .. ~
)
*FIGURE 2·2. J6 INTERFACE CONNECTION
2.2 CONTROL INPUT UNES
The control1nput signals are of two types; those Intended for multiplexing In a multiple drive system, and those in-
tended to control the multiplexing. The controllnput Ilgnals to be multiplexed are:
a. The STEP signal
b. The DIRECTION SELECT signal
c. The HEAD SELECT 20 and 2
1
signals
d. The WRITE GATE signal
The signals which are intended to control the multiplexing are DRIVE SELECT 1 through DRIVE SELECT 4.
The controllnput lines have the following .lectrical specifications. 541. figure 2-3 for the recommended cIrCuit.
Only one drive In the system should be terminated. h should be located at the end of the cable and terminated with
a 220/330 ohm resistor pack. This resistor pack can be disabled by removing the jumper block located near the P5
connector. See figure 2-4 for the location.
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