Kodak Ektapro Slide Projector 4020 - Manual (Page 55)

Accessory slot
This slot was designed for EKTAPRO Models 7020, 9020 and 9020/CINE to receive certain professional
dissolve
units. The 12/7 PIN ADAPTER is a PCB with:
•
an “Intern/Extern” switch for a check. Intern means “Lamp on” and Extern means
“Projector is controlled by the dissolve unit”.
•
connectors to connect the ADAPTER to the projector, and an ADAPTER CABLE for
different dissolve units. The ADAPTER CABLE has a 25 PIN SUB-D connector to connect
the PCB ADAPTER and a combination socket for 12 and 7 PINS.
Accessories that allow the EKTAPRO projectors to communicate with older dissolve equipment are available for
the 12/7 PIN sockets.
The slot contains an Inter IC Communication Interface (I
2
C). The I
2
C bus is used in a modified way only for the
7/12 PIN Adapter. Typical I
2
C functions are not available.
a) Possible Control Functions
- P-Bus function in TTL Level through RS_232_R and RS232_T lines
- LAMP dissolve through SL_DISS line
- I
2
C Communication through SDA, I
2
C_INT and SLC lines
- Voltage Supply for accessory slot modules. See 2.4 CONNECTORS.
- Special Control lines SLOT_A, SLOT_B, SLOT_C
All lines are connected to ground means 12/7 PIN adapter present, PROJECTOR LAMP
off, waiting for dissolve pulses on SL_DISS line
- all high, no ACCESSORY installed
SM 2547-1 Service Manual
Kodak AG, Stuttgart 3-19 03/98