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Chapter Objectives
Selecting Station Management
Messages
Packet Format
Station Management Message Set
In this chapter, you will read about:
The fields you must include in station management messages.
The network parameters you can control using station-management
commands.
The message format of each station-management command and reply.
Station management messages let you configure and alter the network
parameters of nodes on Data Highway II. When you first install your
network, you will probably use station-management commands to set
network parameters at each node. Later, you may use
station-management commands to adjust network parameters.
To enable the interface to send and receive station management messages
initiated by the host computer, you must set the communication-mode
switches on the host board to select the Native mode. (Refer to Chapter 4
for switch-setting procedures.)
Figure 12.1 shows a data frame containing a station management packet
in three layers:
The message fields at the application layer.
The command header fields common to all station-management
command messages.
The fields common to all message transmissions in the Native mode.
Messages are initiated at the application layer and are placed into packets
in the network layer. For outgoing messages, the packet from the network
layer is passed down to the HDLC data-link layer and is sent out as the
data field of the data frame. For incoming messages, the data field from
the data frame is passed up from the HDLC data-link layer as a packet to
the network layer. In Chapter 6, we described the fields of the frame at
the HDLC data-link layer. Here, we describe the fields of the packet
passed up from and down to the HDLC data-link layer. At each layer
below the application layer of the communication software, the data field
is passed up to the next higher layer where additional fields are defined.
12
Chapter
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Table of Contents
Troubleshooting
