Ursalink UR51 Industrial Cellular Router User Guide
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<strong>UR51</strong> <strong>User</strong> <strong>Guide</strong><br />
DTU Mode<br />
Figure 4-4-1-2<br />
Item Description Default<br />
DTU Protocol<br />
TCP Server<br />
Select from "None", "Transparent", "Modbus", and "TCP<br />
server".<br />
- Transparent: the routed is used as TCP client/UDP and<br />
transmits data transparently.<br />
- TCP server: the router is used as TCP server and transmits<br />
data transparently.<br />
- Modbus: the router will be used as TCP server with<br />
modbus gateway function, which can achieve conversion<br />
between Modbus RTU and Modbus TCP.<br />
Listening port Set the router listening port. Range: 1-65535. 502<br />
Keepalive<br />
Interval<br />
Keepalive<br />
Retry Times<br />
Packet Size<br />
Serial Frame<br />
Interval<br />
After TCP connection is established, router will send heartbeat<br />
packet to the client regularly by TCP to keep alive. The interval<br />
range is 1-3600 in seconds.<br />
When TCP heartbeat times out, router will resend heartbeat.<br />
After it reaches the preset retry times, TCP connection will be<br />
reestablished. The retry times range is 1-16.<br />
Set the size of the serial data frame. Packet will be sent out<br />
when preset frame size is reached. The size range is 1-1024.<br />
The unit is byte.<br />
The interval that the router sends out real serial data stored in<br />
the buffer area to public network. The range is 10-65535, in<br />
milliseconds.<br />
Note: data will be sent out to public network when real serial<br />
data size reaches the preset packet size, even though it's<br />
--<br />
75<br />
9<br />
1024<br />
100<br />
87
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