Owners manual

2: Configuring Modbus
Modbus Protocol User Guide 17
Otherwise enter values 3 to 60 to automatically close the last socket after 3 to 60
seconds of idle time.
Redundant Entry Retries after (15-60 sec. 0=disable feature)
Enter the time in seconds for redundant entry retries or set to 0 to disable the feature.
A)dd, D)elete, E)xit Select Function
You can either add or delete entries in the IP address table. They are automatically
sorted into increasing order. Enter E when you are satisfied with the table to return to
the main menu.
Modbus Address From/To
This is the minimum/maximum Modbus slave address (inclusive) to forward to this IP
address.
Slave IP Address
This is the IP address of the remote Modbus/TCP slave. Note the two different ways
these IP are interpreted. In the configuration example above, you see the following
results:
 Polls to Slave #12 will go to IP 192.168.0.12 with Unit ID 12.
 Polls to Slave #70 will go to IP 192.168.0.70 with Unit ID 70.
 Polls to Slave #112 will go to IP 192.168.0.50 with Unit ID 112.
 Polls to Slave #155 will go to IP 192.168.0.50 with Unit ID 155.
 Polls to Slave #201 will go to IP 172.16.123.201 with Unit ID 201.
 Polls to Slave #244 will go to IP 172.16.123.244 with Unit ID 244.
Setting the last/4th IP octet to zero is interpreted as a signal to use the Slave ID as
part of the IP. This allows a Modbus/RTU master to access up to 255 remote
Modbus/TCP slaves. Setting the last/4th octet of the IP to 1-254 causes all slave
polls in this group to be sent to the same IP. 255 is not accepted as the last/4th IP
octet.