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3.4.1 Server Mode
While operating in the server mode, RS485-ETH-N converts MODBUS RTU Over MODBUS TCP, TCP and
MODBUS ASCII Over TCP queries it had received from the Internet or local area network to MODBUS RTU and
MODBUS ASCII queries and forwards them to serial devices. It converts the response it had received from the
devices to query protocol and sends itto the querying device (master).
3.4.1.1 Modbus Request Side
Physical Port:
In the server mode, notification areas in MODBUS Request Side (interface in which information will be requested
from RS485-ETH-N) pane and settings that can be performed are as follows.
Protocol:
Types of MODBUS queries coming to RS485-ETH-N over the Ethernet connection is identified by the help of this
area. Either MODBUS RTU Over MODBUS TCP, TCP or MODBUS ASCII Over TCP is selected.
Port:
Port to which RS485-ETH-N will listen.
Timeout:
In the server mode, if a new query does not come to RS485-ETH-N until the end of timeout period at the query
side, RS485-ETH-N shuts down the TCP connection to the machine sending query and allocates resources for
the new TCP connections. If the time between the two queries is greater than the timeout period, a new TCP
connection should be made before the query is sent.
3.4.1.2 Modbus Response Side
In server mode, notification areas in the MODBUS Response Side (interface in which RS485-ETH-N will make
queries) pane and settings that can be performed are as follows:
Physical Port:
It is for notification purposes. While running in the server mode, MODBUS responses have to come to RS485-
ETH-N over serial connection.
Protocol:
Types of MODBUS responses coming to RS485-ETH-N over serial connection is identified by the help of this field.
Either MODBUS RTU protocol or MODBUS ASCII protocol is selected.
Timeout:
It is the wait time for response from each device on RS485-ETH-N MODBUS network. If no response is received
from the device to which the query is sent, switching to the next remote connection query is performed.
18 | Ethernet / Serial Gateway - RS485-ETH-N
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