Host parameters (group #50), 50 — physical buffer size, 51 — logical buffer size – Xerox ALLY PLUSTM 6287 User Manual

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6287 ALLY PLUS User’s Manual

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Host Parameters (Group #50)

The options in Group #50 are used to control host interfacing. Refer to the

host system documentation for information on configuring these options.

50 — Physical buffer size

This parameter must match the buffer size that the host expects on the

channel to which the ALLY PLUS is attached. The default value of 01 is

for a 4K buffer, and it is most efficient for many systems. A value of 00

indicates a 2K buffer. For EAB support, select a value of 02 or 03 (refer to

Section 6 Coax Host Considerations for additional information). To

program this option, send one of these sequences:

!ALLY!50=00;

2K buffer size

!ALLY!50=01;

4K buffer size (default)

!ALLY!50=02;

2K buffer with EAB support

!ALLY!50=03;

4K buffer with EAB support

51 — Logical buffer size

The logical buffer size must match the contents of the log mode entry table

(found on the host system). The default value is 03 (for 3440 bytes). If a

change is required, the following sequences may be used:

!ALLY!51=00;

960 bytes

!ALLY!51=01;

1920 bytes

!ALLY!51=02;

2560 bytes

!ALLY!51=03;

3440 bytes (default)

!ALLY!51=04;

3564 bytes