17
The transmission rate set for all hosts in the network must be the same, the networked
hosts must be acknowledged and the host number shall differ from each other. The networking
setup interface is as follows:
Figure 4
‑
6 Networking setup interface
After modification of networking setup information, the
machine can operate normally only after power-on again.
Modifying method: select address of the host in drop-down box of “Host number”, click on
drop-down box of “transmission rate” and select the transmission rate of networking bus, and
finally click on the corresponding “Register” column on the networked hosts to display “
√
”. Then
press OK button to save the setup and exit, otherwise press Cancel button to retain the original
setup and exit.
The transmission rate set for all hosts in the networking system
must be the same! After setup of the networking transmission rate, the host must
be restarted to take effect!
If the host under different rates is connected into the
network, no hosts (including other hosts with the same transmission rate) will
provide normal communications. Therefore, for the networking system with
multiple hosts, the networking bus will not operate normally during the process
of setting transmission rate for the hosts one by one and the system networking
returns to the normal condition after the same transmission rates have been set
for all hosts.
Selection of networking transmission rate.
10K, 20K, 50K and 100K can be selected as the networking transmission rate. The rate is
not the faster, the better and shall be selected based on the following situations:
Number of networked hosts
Length of networked bus (distance between hosts)
Type of networking transmission line
Number of networked hosts
The greater the number of networked hosts, the larger the volume of transmitted data on
the bus. Therefore, if the networked hosts are large in number (generally greater than 5), it is
suggested to use a higher communication rate, such as 100K.
Length of networked bus
The higher the transmission rate, the smaller the maximum transmission distance of the
bus. The lower the transmission rate, the better the transmission interference immunity of the
bus, the higher the reliability. It is suggested to use a lower transmission rate for the
transmission distance greater than 1000m.
For the application with larger length of networked bus and great number of networked host,
that is, length requirement and number requirement are contradictory, it is suggested to give
priority to length requirement and use lower transmission rate. If the data reliability cannot be
assured, the number of repeated attempts of the system to send data will be increased, which
causes the data volume to further increase.
The bus transmission distance refers to the distance between two most
remote hosts, as shown in the following figure: