Diagnostic Error Display Port - Iomega ALPHA·10H Technical Description Manual

POWER
SUPPLIES
+5VDC
,. GND
.'
..
'"
"
~
.
+12 VDC
GND
POWER SUPPLY GROUND
POWER SUPPLY GROUND
MINIMUM LENGTH
EARTH
GROUND
HOST
ELECTRONICS
, ELECTRONICS,
" DRIVE'1
.
'
ELECTRONICS
DRIVE 2
GROUNDING I NSTRUCTIONS ____________________________ _
KEEP GROUND WIRES AS SHORT AS POSSIBLE.
• TIE ALL POWER SUPPLY GROUNDS TO A COMMON POINT AT THE POWER SUPPLY.
• CONNECT THE POWER SUPPLY GROUND AND THE CHASSIS GROUNDS TO A GOOD
COMMON EARTH GROUND USING MINIMUM LENGTH WIRE.
• POWER TO MORE THAN ONE CONTROLLER SHOULD COME DIRECTLY FROM
POWER SOURCE' NOT ANOTHER CONTROLLER.
Figure 24. Recommended Grounding
3.4.4 Diagnostic Error Display Port
A four pin error port at the diagnostic connector provides the user with an
8 bit error code corresponding to the hex error codes listed in Appendix A.
Use of this port is especially helpful in identifying problems during
interface development. Pin-out of the port is as follows.
Pin No.
1
2
3
4
Output
Ground
Clock
+5 vdc
Seri al Data
If an error is discovered, it is clocked serially to the display port. A
shift register IC is necessary to receive the bits for display. An optional
diagnostic tool for use with the port to display error information (in hex
format) is available from the manufacturer. Appendix B includes ordering
i nformat ion.
00701300-000
15 December 1984
3-9