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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.
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. Otherwise a full 6 wire cable must be used. Two wire telephone cables will not function because in that case the ground signal levels on both sides will be floating. Unitronics RJ11 RS232 crossover cable RJ11 plug 1 RJ11 plug 2 Function 1 6 DTR DSR 2 5 Signal ground 3 4 TxD RxD 4 3 RxD TxD 5 2 Signal ground 6 1 DSR DTR RS485 is in its design a different interface from RS232.
The RS485 interface allows the creation of. The normal way to implement this is with a two wire system with differential signal levels. These signals are commonly called A and B in RS485 systems. The A signals of all devices should be connected with each other and the same goes for the B signals.
Therefore for RS485 communications no crossover cable is used. An Introduction To Solar Radiation Iqbal Coboy. To prevent noise to interfere with the communications, often twisted pair cable is used. The diagram below shows a basic RS485 cable for use with the RJ11 socket on Unitronics PLCs.
You can easily connect more devices by splitting the cable at one connector and adding another cable to it. Unitronics RJ11 RS232 programming cable DB9 RJ11 Function 2 3 RxD TxD 3 4 TxD RxD 4 6 DTR DSR 5 2 + 5 Signal ground 6 1 DSR DTR The Jazz PLC series from Unitronics are not standard equipped with a RJ11 connector for serial communications.
The only way to add RS232 capabilities to the Jazz PLCs is by using the MJ20-PRG programming port add-on module. Windactylo Download Music. This MJ20-PRG module clicks in the PLC and provides one RJ11 socket for serial communications with a PC.