9600 Service Manual - gmecorp-usa.com

Workstation Control 15
COMMUNICATIONS PCB
Assy. #00-872127 - Sch. #00-872125
The Communications PCB provides serial and parallel communications capabilities for
the Motherboard with external devices, such as a printer. Internal system
communications with the Control Panel Processor PCB and the C-Arm are also handled
by the PCB. The circuit board plugs directly into the AT Motherboard (see Figure 4).
SERIAL COMMUNICATIONS
The Communications PCB handles all of the serial communications for the AT
Motherboard to the Workstation Control Panel Processor PCB and the C-Arm.
AT Motherboard to Control Panel Processor
Signals from the 386 AT Motherboard are received by DUART U27 on the AT
Communications PCB via the data bus. U27 converts this information to RS232 serial
data. The serial data then passes through the Aux Interface PCB, through RS232
transceiver U7 on the Control Panel Processor and to microcontroller U5. Microcontroller
U5 on the Control Panel Processor PCB communicates over the same path to the AT
Motherboard
UART U26 on the AT Motherboard handles discrete signals for the room interface relays
on the Aux Interface PCB when they are used.
AT Motherboard to C-Arm
Communication between the C-Arm and Workstation is established during the boot
process. All 20 arrows will be displayed on the Control Panel Display, as shown below,
during this part of the boot process.
During normal operation, the Technique Processor and 386 AT Motherboard send
information such as:
• Shot log file information from the C-Arm to the Workstation
• Commands such as L>R, SAVE and CART MODE from the Control Panel to the
Workstation
• “Enable Boost” command to the C-Arm when (CHOLE)/DIGITAL SPOT is selected on
the Workstation
The TXD and RTS signals from Port B of the serial communications controller U39 on
the Technique Processor PCB are sent to the 386 AT Motherboard on the Workstation.
They pass through RS232 driver/receiver U52 on the Technique Processor PCB and
then pass through the Mainframe Motherboard, the Interconnect cable, and enter the