System Monitor
80175-01
13
SERIAL INTERFACE SETUP
Proper operation o f the Serial Interface requires that the switch and jumper settings b e set
appropriate for both the configuration of the 3300 rack(s) and the style of communications between
the host device and the Serial Interface. Once these settings and the proper cable connections are
made, the interface can receive command messages and return response messages to a host device.
Refer to the section 16, entitled Protocol Specifications, for information on how to specify the data
(direct or status values) within a protocol message command. The locations (addresses) o f the
desired data are dependent on the configuration of the 3300 rack and the type of protocol used.
Host devices which communicate with the Serial Interface each have their own unique characteristics
regarding how the user is allowed to specify command messages. Refer to the host documentation
to see how the data fields within the protocol command messages are specified. Use the information
provided in section 16 to determine the protocol addresses of the 3300 rack data. These addresses,
along with a size or byte count field in the command message from the host, control what data is
returned in a reply message from the Serial Interface.
Note
The exact message formats for the protocols used by this interface are not described in
this document. References to certain fields within these messages, for example ADDR and
SIZE, are made in some examples as an aid t o understanding the example. I t is
presumed that the reader understands the message formats in those cases. If the reader
is not familiar with the protocol requirements, he is referred to the documents listed in the
forward. In general, the host user interface should allow specification of data addresses
without dealing directly with the message formats themselves.
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