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Service Manual
ISTAT I4X
9.
COMMUNICATION SETTINGS
9.1
EIA (RS)232 to EIA (RS)485
The I4X RS232 to RS485 communications interface does not require any settings for its
operation.
However for correct operation when using RS485 the devices that are connected to the I4X
will have to be correctly addressed. When more than one device is connected on the RS485
port each must have a different address number. The maximum number of devices that can
be connected to the RS485 port is 31.
The default serial settings for communicating devices vary and when more than one device
is connected to the I4X they should all have the same serial settings.
9.2
Ethernet to EIA (RS)232
The I4X Ethernet to RS232 communications interface requires that the settings for the
Ethernet and the RS232 ports are configured prior to use in the application.
done using QDSP and a Web browser.
The RS232 settings in the I4X must match those for the RS232 device attached. The RS232
device attached must also be assigned a Modbus device address.
9.3
Ethernet to EIA (RS)485
The I4X Ethernet to RS485 communications interface requires that the settings for the
Ethernet and the RS485 ports are configured prior to use in the application.
done using QDSP and a Web browser.
All of the RS485 devices connected to the I4X must have the same serial settings as the
RS485 port on the I4X. Up to 31 x RS485 devices can be connected to the I4X RS485 port
and each must be assigned a unique Modbus address in the range 1 – 247.
9.4
Ethernet IP addresses
When using the Ethernet each device requires a unique IP address. There are two ways of
assigning this address to the I4X:
•
address
•
address
Fixed IP address: This is the most common method used where the IP address is defined
by the System Administrator. The IP address should be valid for the net, it has to be unique
and in the same subnet as the computer that it being used with. The following information is
required for this addressing:
IP Address
Subnet mask
Gateway
DHCP address: This is an automatic method of assigning IP addresses. When a device
connects to the Ethernet, it will search for the DHCP server which will assign the next
available IP address using the DeviceInstaller program.
Fixed IP
DHCP
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I4X/EN CO/D
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