2.1.06 Operation Panel
The Serial I/O Port (Ports 20 - 23) of the MPU reads the operation panel switch data from the
operation panel control LSI (Location IC1: BUS148S).
A two byte (15 bits +1 parity bit (even parity)) command (OPTXD) is transmitted from the MPU
to the operation panel LSI in synchronization with the OPCLK signal. Once the LSI decodes the
command, the command must pass a command code check and have no parity errors. Then, the
specified I/O control will return the two byte command response to the MPU.
2-1-06a.tif
Principles of Operation 2 - 12 Microline 520/521 Service Handbook
P/N 59257803
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