9600 Service Manual - gmecorp-usa.com

C-Arm Control 37
Technique Processor to and from Image Function PCB
Communication with the Image Function PCB is established during the boot
process. The Control Panel Display will display 10 arrows as shown below at
this point in the boot process.
During normal operation, this communication link enables the Technique
Processor to send commands such as:
• Request for Status
• Reset Image Function PCB
• Commands to control Camera and Collimator Motors
• Commands to change the Image Intensifier field size
• Commands to control Camera modes such as Unity Gamma, Antivignetting
• Commands to control collimator modes such as Normal, MAG1 and MAG2
On the older Technique Processor PCB, the port D RXD and TXD lines from
communications controller U39 pass through U5, an RS-232 driver/receiver and
leave the Technique Processor PCB at P2. These signals then pass through the
Motherboard and enter the Image Function PCB at P2. They pass through
RS232 driver/receiver U17 and are then received by microcontroller U16.
On the newer Technique Processor PCB, the port C TXD line passes through
Port Select GAL U53 and then to RS232 Driver/Receiver U5. The signal
received at the port C RXD input comes through U5, makes its way through Com
Select GAL U38, Port Select GAL U53, and finally to pin 36 (RXD) of
communications controller U39.
The signals pass through RS232 Driver/Receiver U17 on the Image Function
PCB and enter microcontroller U16, which in turn issues commands on the data
bus to perform the desired function.
NOTE: The CTS and RTS signals are not used in this communication link.
The Technique Processor sends a request for status to the Image Function PCB
at least once a second to check for errors and to confirm that the Image Function
PCB is still functioning.
NOTE: Refer to the Image System section of this manual for error codes that relate to the
Image Function PCB.