9600 Service Manual - gmecorp-usa.com

C-Arm Control 35
SYSTEM COMMUNICATIONS
The Technique Processor PCB within the C-Arm and the 386 AT Motherboard
within the Workstation are the communication managers of the system. RS232
is used throughout the system except for the RS422 link between the C-Arm
Control Panel Processor and Power/Signal Interface PCB.
The following acronymns are used as part of signal names along with
designators to specify the channel, source, etc.:
• TXD = Transmit Data - connected to RXD of receiving PCB
• RXD = Receive Data - connected to TXD of sending PCB
• RTS = Request To Send - connected to CTS of receiving PCB
• CTS = Clear To Send - connected to RTS of sending PCB
C-ARM COMMUNICATION
The Technique Processor PCB manages the serial communications for the C-
Arm utilizing U39-a four channel serial communication controller. The Technique
Processor communicates with the following:
• C-Arm Control Panel Processor PCB.
• Image Functions PCB.
• Workstation.
There are two versions of the Technique Processor PCB. They differ in the
associated communication circuitry that is used in conjunction with
communication controller U39. The newer version, assembly # 00-877744, uses
2 GALs, U53 and U38, to control port selection and communication type.
NOTE: Switches 1 and 2 of S1 on the Technique Processor PCB (-02 and higher) must
be “ON”(closed) to enable serial communications on the 9600 system.
1 2 3 4
OFF
NOTE: RTS (Request To Send) and CTS (Clear To Send) lines on U39 (pins 21, 23, 25,
27, 29, 31, 33 & 35) all become a logic low on the Technique Processor during the
boot process.