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Unitronics PLC interfacing • • • RJ11 serial RS232 and RS485 connections Unitronics is a PLC-manufacturer based in Israel. For communications, many of their products are equipped with an or serial port. These ports use an RJ11 socket as physical connector. The RJ11 connector can be used for both RS232 and RS485.

The actual functionality is determined by DIP-switches on the mainboard of the PLC. The RJ11 socket is interesting, because the manufacturer choose to have a symmetrical pin-layout, just as with the MMJ connector on and the RJ45 jack in the. A symmetrical pin-layout allows two DTEs, data terminal equipment, to be connected directly without use of a modem or other DCE, data communication equipment. It shouldn't however be a surprise that the pin assignment on the RJ11 socket on Unitronics PLCs is different from the two sytems mentioned above.

The existense of an RS485 port on the socket makes it even a little bit more difficult. When in full RS232 mode, the six available pins are assigned to the most used RS232 signals. Pin 1 and 6 however are reassigned to the A and B lines when the port is used in RS485 mode. These pins are normally used for the DTR, data terminal ready and DSR, data set ready signals. On some PLC models it is possible to mix RS232 and RS485 communications. When the DSR and DTR signals are not used, the two pins can be used for simulraneuous RS485 communication.

Figure 4 4 5 Figure 5 From the Server Settings window, the user should select the server configuration file generated by the AdminTool program. Clicking the Upload to Server button will send the data file to the SFTP server. Alternatively, the user can select Settings Application Preferences at any time to provide the server information. Karaoke professional software. If not configured, a message will be displayed (see Figure 4) and the user will be asked to specify the server settings files (see Figure 5).

Unitronics PLC RJ11 pin assignment Pin RS232 function RS485 function 1 DTR A (+) 2 Signal ground RS232 signal 3 TxD RS232 signal 4 RxD RS232 signal 5 Signal ground RS232 signal 6 DSR B (–) Basic Unitronics RJ11 connection cables The symmetrical pin layout of the RJ11 sockets on the Unitronics PLCs allows an easy way of interconnecting the PLCs with both RS232 and RS485 communications. For RS232 a crossover cable is used where pin 1 is connected with pin 6 at the other connector, pin 2 with pin 5, etc. This interconnects the transmit and receive signals of both PLCs, and also the DTR and DSR. If handshaking is not necessary, an ordinary 4 wire telephone cable could be used, provided that the pins are cross-connected as shown in the picture below.