ACC Theory of Operation
2-14
polled at the end of 32 milliseconds must be branch 31 for TALK TAP
messages. If not, the poll cycle is in error and an error flag is set in the
next SYNC TAP message to indicate a POLL OVERLFOW; for example,
system overload or poll sync loss.
Transition Board (78581-61253)
This PCB interfaces from the RJ45 connector to the main PCB. There are
32 ports label from 0 through 31. Port 0 is the master time port for the
central stations. Ports 1 through 24 are bedside ports. Ports 25 through 31
are for other central stations, computers, or mainframes. The transition
board supplies the input/output data from the bedside to and from other
devices.
Power Supply (M2604-60002)
This is a 5V automatic switch power supply. It supplies power for the main
PCB, power on LED and the 5V indicator LED on the rear of the power
supply board.
Figure 2-2. Internal Components of the ACC
Power Supply
Main PC Board
Transition Board
Summary of Contents for 78581B
Page 46: ...ACC Maintenance 4 2 ...
Page 54: ...Installation Responsibilities Customer and Agilent Technologies 6 4 ...
Page 90: ...Procedures 8 28 ...
Page 98: ...Contacts 10 6 ...
