Serial Slave Mode - Delta Electronics IFD9506 Operation Manual

Notes:
The number of connections to IFD9506 made by Modbus TCP master cannot exceed the upper

limit of 16. If the limit is exceeded, IFD9506 will directly abandon the connections. Pay attention to
the number of connections at the Ethernet client / master, or shorten the connection-alive time in
DCISoft so as to avoid too many idle connections.
For timer parameter setting, please refer to Section 6.6 Timer Setting.
The Modbus TCP master is allowed to send multiple requests at the same time. However, due to

the serial data transmission restriction: one register of data per time, the data received by the
Ethernet terminal will queue up in the internal temporary storage area of IFD9506 and will be
processed successively by the serial terminal. When the traffic is too busy, please consider to
lengthen the wait time of timeout.

6.3 Serial Slave Mode

As a serial slave, IFD9506 is connected to the serial master by RS-232 or RS-485 port and is connected to the
Ethernet server/ slave by Ethernet port.
The communication instruction is sent by the serial master and is transferred to the Ethernet by IFD9506. And
then IFD9506 will be waiting for the response from the Ethernet server/ slave, and eventually send the response
back to the serial master.
 Network Architecture
 Operation Procedure
Select Serial Slave for Master Configuration field, Modbus or User Define as COM protocol and RS-485
or RS-232 as the communication port.
The Modbus mode operation is described in the following section. For User Define mode operation, refer
to the description in Section 6.4.
 Modbus Slave
The equipment of the serial terminal works as a Modbus master. IFD9506 converts the Modbus
instruction received from the serial port into a Modbus TCP instruction and sends it to the Ethernet
server/ slave. The device monitoring table cannot be used in this mode. The Serial Slave Mode table
should be set beforehand, and the station address which corresponds to the destination IP address
needs to be included in the Modbus instruction.
DVP-PLC Operation Manual
Ethernet Communication Module IFD9506
31