Table of Contents
Advertisement
区 JALLINCKRODT
UNIVERSAL INTERFACE
Refer to schematic LF P/N 800941 at the end of this chapter, The
Universal Interface may be installed in either of two separate con-
figurations determined by the internal cable assembly (P/N
800261). The Interface may be either a two wire or four wire sys-
tem.
The Universal Interface couples the injector to an imaging system.
The imaging system can trigger the injector to start by closing a
switch between pins J3-13 and J3-14 of the universal interface
connector as shown in Figure 3-12 and schematic 800941 (and as
depicted in Figure 3-11 as pins 1 and 2 of the 4-pin universal inter-
face connector). When the ground from J3-13 is applied to J3-14,
the signal called Remote Start 1 is driven low and turns on opto-
coupler U9. This low signal is inverted at U5 and is sensed as a
high signal on U4 pin 42. The main processor detects this signal,
and initiates
an injection.
However, if a scan delay has been
programmed into the console processor from the selected protocol,
the main processor sends an output at U4 pin 31 (i.e., OP2) to pin
1 of inverter U2 when the scan delay has expired. The injector
energizes relay K1 (CT Scan Control Signal) which provides con-
tact closure, allowing the imaging system to start the image.
For the two wire system refer to general wiring diagram Fig 3-13
and detailed wiring diagram Fig 3-14. In this configuration the
Injector is started manually by the CT technologist. If a Scan Delay
has been programmed on the Injector for this injection, the Injector
closes Relay K4 at the end of the Scan Delay. This closure can be
used by the imaging system to start the imaging
scan. If there is no
Scan Delay programmed, the Injector closes Relay K4 at the begin-
ning of the injection.
In either configuration: if the Scan Delay is shorter than the injec-
tion duration Relay K4 will open at the end of the injection, other-
wise the relay will be closed for a minimum of .5 seconds.
CAUTION!
The external start connection must not apply voltage to the start circuit.
Only a switch closure may be provided. If the external start connection
applies voltage to the start circuit, the start circuit could be damaged.
800961-C Nov. 2000
3-45
Advertisement
Table of Contents
