6100 BSC Programming Manual

6100 BSC Concepts and Context
If a station receives a block without error but isn't ready to
receive the next one, the application sends a WACK reply within
two seconds. The application CONTROL request can perform this
function. If the application fails to send a WACK, the other
station can send an ENQ to request another reply.
Line Configuration Options
The line configuration options you define in SYSGEN specify parts
of the electrical interface, message formats, resource
utilization, and error-handling strategies for the line. Most of
your choices will depend on the features of hardware you'll use
on the link: for example, the characteristics of your modems,
the delays built into some terminals, the character code a device
supports, or the expected quality of a line.
The NonStop System Management Manual describes each option
in detail. The following summary of options emphasizes how
your choices affect the protocol. Section 3 of the
CP6100 I/O Process Programming Manual mentioned some effects on
the efficiency of the line.
For this discussion, we group the parameters according to the
aspects of protocol they influence. Figure 1-20 lists the
parameters in their functional groupings.
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| |
| Line and Modem Control Transmission Control |
| |
| BSCINTERNALCLK BSCIDEXCH |
| BSCBAUD<n> BSCPTPT |
| BSCCONNECTTO<n> BSCSECONDARY |
| BSCDISCONNECTTO<n> |
| Message Format |
| BSCFULL, BSCHALF |
| BSCPPSW BSCITBSIZE |
| BSCPPNS BSCSYNCS |
| BSCLRC8 |
| |
| Error Handling Character Code |
| |
| BSCRETRIES BSCASCII |
| BSCREADTO |
| BSCNONSTOPON, BSCNONSTOPOFF |
| |
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Figure 1-20. Breakdown of Line Configuration Parameters
1-41