User's Manual

PMAC VME Hardware Reference Manual
12 PMAC VME E-Point Descriptions
PMAC VME Option 1A Jumpers
E17E - E17H: Amplifier Enable Polarity Control
E Point and
Physical Layout
Location Description Default
E17E
B1 Jump 1-2 for high TRUE AENA (5-8).
Remove jumper for low TRUE AENA (5-8).
No jumper installed
E17F
C1 Jump 1-2 for high TRUE AENA (5-8).
Remove jumper for low TRUE AENA (5-8).
No jumper installed
E17G
C1 Jump 1-2 for high TRUE AENA (5-8).
Remove jumper for low TRUE AENA (5-8).
No jumper installed
E17H
C1 Jump 1-2 for high TRUE AENA (5-8).
Remove jumper for low TRUE AENA (5-8).
No jumper installed
Low-true enable is the fail-safe option because of the sinking (open-collector) ULN2803A output driver IC.
E18 - E21: Encoder Single-Ended/Differential Control
E Point and
Physical Layout
Location Description Default
E18
D2 ENC 5 through 8:
Jump pin 1 to 2 to tie complementary encoder
inputs to 2.5V.
1-2 Jumper installed
for
E18 - E21.
E19
D2 Jump pin 2 to 3 to tie complementary encoder
inputs to 5V.
For no encoder connection: Jump pin 1 to 2.
E18: ENC 5
E19: ENC 6
E20: ENC 7
E21: ENC 8
E20
D2 For single-ended encoders: Jump pin 1 to 2.
For differential line-driver encoders: Do not care.
E21
D2 For complementary open-collector encoders:
Jump pin 2 to 3.