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CTI 2572 Installation and Operation Guide
3
1.3. Serial Ports
The 2572 is equipped with two serial ports. These ports are provided for use with module
configuration and diagnostic programs. In addition, the ports may be used to access the local PLC.
Devices that communicate with the PLC using the Non Intelligent Terminal Protocol (NITP) can
access the PLC processor as if they were directly connected to the PLC program port.
Optionally, NITP commands sent to a serial port can be redirected to another node on the TCP/IP
network. Using this feature, PLC programming software program running on a PC connected to a
2572 serial port can perform remote programming on another PLC on the network. This feature
might be used where a programming tool that uses TCP/IP (such as SoftShop programming software)
is not available.
Port 1 uses a male DB9 connector to provide a subset of RS-232C. Port 2 provides an RS-422
electrical interface using a female DB9 connector. Since the pin configurations of the ports match
those of SIMATIC TI545 PLCs and the 2571 Programming Port Expander module, standard cables
can be used. The ports may be configured via switches for baud rates of 1200, 2400, 9600, or
19,200. Optionally, PLC logic can be used to set the communications parameters for the ports. Both
ports can operate concurrently with the Ethernet port; however, heavy serial port activity may
degrade network performance. See Appendix A for a diagram showing the port pin configurations.
Figure 3. 2572 Serial Ports