Kodak DryView 8150, Service Manual, Page: 215 / 470

Section 6 -- Theory of Operation
6-13
2005 July Rev. B 7F3318
6-4-1. Master/Slave Micro System
6-4-1-1. Serial Communication Protocol
The MCS uses MicroComm Serial Communication Protocol to allow the Master CPU on the MCS Board to
communicate with distributed micros on a simple, low-cost serial interface. Slave micros are included on
the following circuit boards:
1. Optics Module Control Board (Slave 1)
2. Densitometer Board (Slave 2)
3. RF Tag Interface Board (Slave 3)
4. Feeder Control Board (Slave 4)
6-4-1-2. Physical Interface
The physical interface includes only a TXD (transmit) line, an RXD (receive) line and a Reset line (see
Figure 6-7). In this configuration the RXD lines of all slaves are tied together and connected to the TXD
line of the Master CPU, and the slave TXD lines are tied together and connected to the RXD line of the
Master CPU.
Figure 6-7. Master/Slave Physical Interface
6-4-2. MCS Board
The MCS Board contains the Master CPU and auxiliary circuits that control the electromechanical
components of the laser imager. See sheet 2 of the 8150 Functional Diagrams. (Functional Diagrams are
on the Kodak Health Imaging User and Service Documentation Library CD set.)
The MCS Board also provides a pixel data path from the DRE to the laser and includes a Media Lookup
Table (LUT) and associated AIQC circuits. Direct control functions of the MCS Board include:
1. Interprets and controls serial communications.