Cambium Networks cnReach N500, Руководство пользователя

Страница: 69 / 236

cnReach N500 User Guide System Configuration
phn-4673_003v000 (November 2018)
2-37
TCP Terminal Server
TCP Terminal Server permits TCP connections from a Host or TCP Terminal Client to terminate on the
Serial Port interface of the radio, therefore allowing Serial End Devices to communicate over the
Ethernet Radio System.
When set to Terminal Server, the user defined (TCP) Local Port number is monitored for incoming TCP
connections. If the Terminal Server observes traffic on that TCP port it creates a session to open the
Serial Port and pass data to the connected Serial End Device.
The session will end if the Host that initiated the session terminates it, or if the Idle Timeout is reached
without any traffic present on the TCP port.
Message Mode should be used with Modbus, DNP3 or other message oriented Protocol. When set to
Message Mode, the radio waits for a pause in the Serial Data being received on the Serial Port from the
End Device, i.e. the radio waits for the End Device to finish communicating the message before
transmitting the message as a whole. If the message cannot be transmitted as a whole, the radio will
break it up between transmissions and the Master will reassemble upon demodulation. Some RTU’s or
recloser controls (such as those from Schweitzer Labs) can be sensitive to breaks in the messages.
Message mode can reduce the incident of packet loss.
Enabling TCP_NODELAY disables Nagle’s algorithm for TCP transmissions which can be helpful for
large numbers of small packets on a low-bandwidth connection.
The QoS settings allow for prioritization of serial services traffic by applying TOS bit settings to
generated packets.