Rabbit eDisplay User Manual - J10
User’s Manual
23
boards can be made to order in volume with the digital outputs pulled up to Vcc or +K, or
pulled down to GND. Contact your authorized Rabbit distributor or your Rabbit sales rep-
resentative for more information.
+K is an externally supplied voltage of 9–40 V DC used primarily in combination with
current sourcing outputs, and should be capable of delivering up to 2 A. Although a con-
nection to a +K supply is not absolutely
required
with sinking outputs, it is
highly recom-
mended
to protect against current spikes when driving inductive loads.
Connect the positive +K supply to pin 3 of screw-terminal header J3 and the negative side
of the supply to pin 12 of screw-terminal header J3. Exercise care to connect this supply
correctly because the +K inputs are
not
protected against reverse polarity, and serious
damage to the OP7200 may result if you connect this supply backwards.
When you are using the same DC power supply as the main power supply for the OP7200
and as the +K power supply, Rabbit recommends that you tie the -PWR connection to
ground. Since this step will bypass the reverse-polarity protection afforded by the full-
wave bridge rectifier, ensure that the positive leads from the power supply are connected
correctly to prevent damage to the OP7200.
Figure 10. +K, Power Supply, and Sample Load Connections
D23
D20
+PWR
PWR
+K
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
GND
IN12 IN13 IN14
IN15 /RST
TXC RXC
TXD RXD 485 +485 GND
J10
J15
IN16 IN17 IN18
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
A
IN6
AIN7
AGND
IN0 IN1 IN2
IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 IN1
1
J2
J6
J3
J1
CAUTION: Disconnect power
before making or removing
terminal connections.
J2
J6
J3
J10
PROG
1
1
1
1
E-Net
R-Net
1
USR PWR
LNK ACT
+
Tie
-PWR
to
GND
if using same
power supply for
OP7200 and
+K
Connected to
Sinking
Output
Connected to
Sourcing
Output
Load
Load
External
+K
Power
Supply
+
AC
Adapter
+PWR
-PWR
Connected to
Sinking
Output
Connected to
Sourcing
Output
OUT2
+K
GND
OUT5
Load
Load
3
6
9
12