6.1.3.
Port Buffers and Any-to-Any
Mode Ports
The MDS provides 256K or 512K (optional) of non-volatile
buffer memory that can be shared by all MDS ports. Buffer
memory is dynamically allocated in blocks of 2K characters.
The Status Screen lists the amount of Buffer Memory currently
used by each port.
The MDS uses buffer memory in three different ways, depending
on the user-selected port mode.
·
Any-to-Any Mode Ports, Mux Input Ports:
When two
ports are communicating at dissimilar baud rates, the buffer
memory prevents data overflow at the slower port.
·
Mux Output Ports:
The MDS reserves 8K of buffer
memory for multiplexing purposes.
·
Buffer Mode Ports:
Stores data received from connected
devices. The user issues a read command (/R) to retrieve
data from each port buffer.
If data is allowed to accumulate in a port buffer, this will
decrease the amount of buffer memory available to other ports.
If the Status Screen indicates an accumulation of data, the /E
(Erase Buffer) or /R/C (Read and Clear Buffer) commands can be
invoked to clear the buffer.
6-8
MDS Series Users Guide
Summary of Contents for MDS-16
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