Bayer HealthCare MEDRAD SCT 110, Operation And Installation Manual

Page: 19 / 30

13
Signals and Descriptions
*The ISI scanner interface is a 37-pin D shell connector (J1), located on the ISI module. The
following signals are provided to work properly with the scanner.
**The scanner manufacturer is responsible for assuring the scanner will not respond to a Scan
Start signal until it is safe to do so.
Caution: System damage may occur if voltage is applied to J1 Pins 16, 18, 23, 25, 27,
or 33. Only connect these pins to isolated switch or relay contacts in the scanner.
Signal
Operation
D
escription
*J1 Pin Numb er
Voltage Logic
Scanner Read
y
This is an input signal fro
m
the
scanner
to the injector. It
tells the
injector that the
scanner is ready. This
signal en
sures that
the
injecto
r cannot
be armed unless the scanner
is ready.
This signal is used to pre
vent a
condition where you
could receive
contrast
media
but no scan.
When the signal is high, it allows
the injector
to arm. If
the
user wants to arm the injector, and this signal is low, the injector cannot be armed.
25
If
+5v is switched from pin
16
to 25 by the scanner, the injector can be a
rmed. If pin
25 is zero volts, the injector cannot be armed.
Injector Di
sa
rm
This is an input signal fro
m
the
scanner
to the injector. It
allows the
scanner
to stop the
injection at
any
time by
disarming it. This
signal would
immediately st
op the injection of
contrast.
If the in
jector is armed (this
signal would be high), making this sig
nal go to zero disarms
the injector.
25
Note that p
in 25 performs a
dual function. If it is h
igh
(+5v) the injector is allowed to arm. If it
goes low (0v), it
will disarm the injector.
Start
Injector
Requ
est
This is an input signal fro
m
the
scanner
to the injector. It
allows the
scanner
to request that the injector
start injecting. If the injector is armed, and
the scanner initiates a "Start
Request", fluid will be delivered, oth
erwise the signa
l is ignored.
The signal from the scanner
is
normally low. When it goes high, th
e "Start Request" is sen
t
to the scanner.
27
Pin 2
7 is normally at 0v.
When the scanner switches the isolated 5v
from pin 16 to
pin 27,
the "S
ta
rt Request"
is
made.
Injector Read
y
This is an output sig
nal from the
injector to the scanner indicating the injector is armed or
holding.
When the
scanner
is initiating the entire
scanning sequence, this signal is used to
notify the
scanner that the injector is
ready to accept a start or has entered a "hold" phase. The injector will start when receiving a "Start injector request."
An injector Ready
signal is sent
to the
scanner once
the injecto
r
is armed.
1 &
2
The scanner provides a signal on pin 2 of J1. When the injector is armed, this signal is switched back to the scanne
r through pin 1.
The signal is low while inj
ecting.