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DTU Mode
Item
Description
Select from "None", "Transparent", "Modbus", and "TCP
server".
-
Transparent: the routed is used as TCP client/UDP and
transmits data transparently.
DTU Protocol
-
TCP server: the router is used as TCP server and transmits
data transparently.
-
Modbus: the router will be used as TCP server with
modbus gateway function, which can achieve conversion
between Modbus RTU and Modbus TCP.
TCP Server
Listening port
Set the router listening port. Range: 1-65535.
After TCP connection is established, router will send heartbeat
Keepalive
packet to the client regularly by TCP to keep alive. The interval
Interval
range is 1-3600 in seconds.
When TCP heartbeat times out, router will resend heartbeat.
Keepalive
After it reaches the preset retry times, TCP connection will be
Retry Times
reestablished. The retry times range is 1-16.
Set the size of the serial data frame. Packet will be sent out
Packet Size
when preset frame size is reached. The size range is 1-1024.
The unit is byte.
The interval that the router sends out real serial data stored in
the buffer area to public network. The range is 10-65535, in
Serial Frame
milliseconds.
Interval
Note: data will be sent out to public network when real serial
data size reaches the preset packet size, even though it's
Figure 4-4-1-2
UR51 User Guide
Default
--
502
75
9
1024
100
92
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