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RUGGEDCOM ROS
User Guide
Figure 78: Permanent and Dynamic Master Connection Support
1. Permanent Master (Polling RTUs) 2. Dynamic Master 3. RMC30 4. Ethernet 5. RTU
The permanent master is connected to the Raw Socket port of the RMC30. Raw Socket is configured to be
connected to all Preemptive Raw Socket ports where polled RTUs are connected (multiple incoming connection).
Preemptive Raw Socket configuration on all ports connected to RTUs will point to that Raw Socket as a permanent
master (IP address and Remote IP port).
A dynamic master can establish a connection to any Preemptive Raw Socket port at any time and temporarily
suspend the polling process (until the dynamic connection is cleared or times out).
Section 5.4.1.5
Port Redirectors
Port redirectors refer to software packages that emulate the existence of serial communications ports. The
redirector software creates and makes these virtual serial ports available, providing access to the network via a
TCP connection.
When a software package uses one of the virtual serial ports, a TCP connection request is sent to a remote IP
address and IP port that have been programmed in to the redirector. Some redirectors also offer the ability to
accept connection requests.
The Raw Socket protocol is the one most frequently used on the RMC30 for connection to serial port redirection
software. The Telnet Com Port protocol may be used in place of Raw Socket if the redirection software on the
other end of the connection also supports the serial break command, as defined in
mode, a serial break received from the remote RFC 2217 compatible client will be transmitted as a serial break
on the configured serial port, and a break signal received on the serial port will be transmitted as an RFC 2217
compatible break signal to the remote client. Note that a break signal on a serial port is defined as a condition
where the serial data signal is in space or logic zero state for longer than the time needed to transmit one whole
character, including start and stop bits.
Port Redirectors
5
1
3
2
3
4
3
3
Setup and Configuration
5
5
5
RFC
2217. In Telnet Com Port
Chapter 5
131
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