Serial Device Server Mode (P2P Mode); Timer Setting - Delta Electronics IFD9506 Operation Manual

Ethernet Communication Module IFD9506
makes the judgement of the end of the packet based on the packet length with the unit of byte. If the
data is too long in size, it will be truncated till the corresponding length. If it is too short, the packet will
be discarded without being forwarded or sent back.
3. Start Item or Stop Item: The boxes of Start Item and Stop Item can be checked at the same time, but
they cannot be used together with Fix Length. After Start Item or Stop Item box is checked, you can
specify 1 to 3 characters as the judgment condition.

6.5 Serial Device Server Mode (P2P Mode)

In Serial Device Server mode, IFD9506 supports the two-way communication, but not limited to the
request-response way. It supports the User Define communication protocol only, but does not support the
settings on the User Define page. IFD9506 transfers all data received, which equals no condition is specified
and makes the judgment of the packet end based on 1.5 characters of time. At the beginning of communication,
the Ethernet equipment must first establish the connection to IFD9506, and then IFD9506 uses the connection
to forward the data received from the serial port.
When using RS-485, please be aware that the full-duplex communication cannot be made via the RS-485 port.
If the Ethernet port and serial port transmit instructions at the same time, the serial equipment will not be able to
receive data properly, which will result in a communication error. Therefore, please make sure that only one
device can transmit the request or response at a time.

6.6 Timer Setting

There are three important time parameters for IFD9506.
Keep Alive time

Applicable modes: Serial Master, Serial Slave and Serial Device Server
When the communication is idle, IFD9506 closes the connection to the Ethernet client/ master or
Ethernet server/ slave based on the set time so as to avoid the idle connections occupying connection
numbers (the upper limit of connection number is 16, and the connection will be rejected once the
upper limit is reached).
In general use, the setting value does not exceed the default value to avoid an excessively long idle
connection. When Ethernet client/ master has no reconnection mechanism, or Ethernet server/ slave
has only a single connection, the setting value is increased to prevent disconnection. The setting value
must be greater than the Modbus timeout setting in order to prevent disconnection before Modbus
timeout occurs.
Modbus Timeout

Applicable modes: Serial Master and Serial Slave
When the serial slave or Ethernet server/ slave does not respond to the Modbus or Modbus TCP
instruction and the timeout setting is exceeded, IFD9506 responds to Ethernet client/ master or serial
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DVP-PLC Operation Manual