Owners manual

2: Configuring Modbus
Modbus Protocol User Guide 11
Network/IP Settings
Select 1 to configure the Device Server’s network parameters.
The following values can be set or changed. To understand and select the
appropriate values, consult one of the many TCP/IP books available today and your
network administrator.
IP Address
The IP address must be set to a unique value on your network. If you are not familiar
with IP addressing on your network, please consult your network administrator.
Please refer to the IAP User Guide for your Device Server for more details about IP
addresses.
If the IAP Device Server is set to an address already in use, it displays an error code
with the LEDs and will not operate properly. If you plan to use DHCP, set the IP to
0.0.0.0 to activate DHCP.
Set Gateway IP Address (Y/N)
Most users could select N for this case. You only need to choose Y if the IAP Device
Server must communicate to remote TCP/IP networks through a router or gateway. If
you select Y, you must also enter the IP address of the default gateway within your
local network.
Set Netmask (N for default)
Most users could select N, which causes the IAP Device Server to automatically use
the standard netmask appropriate for the IP address entered. Users who want a non-
standard netmask need to enter the new subnet mask in the traditional form, for
example, 255.255.248.000.
Telnet Configuration Password
The Telnet configuration password can be set to disable unauthorized access to the
setup menu via a Telnet connection to port 9999. To access the setup menu through
the serial port, you do not need to enter the password.
Serial and Mode Settings
Select 2 to change the basic serial parameters. The following values can be set or
changed.
Attached Device (1=Slave, 2=Master)
As mentioned in the introduction, Modbus/RTU devices are defined as either slave or
master devices. Type 1 if the attached device is a slave (such as controller or PLC)
or 2 if the attached device is a master (such as a computer running graphical human-
machine-interface (HMI) software).