RJ45 converter to rs232 cable RJ45 - RS232 Converters fit, for example, printers and PC. Cables adapters are usually powered by the external 5V and convert RS232 RJ45 signals. The tables below give the wiring : RJ45 RJ45 RJ45 Registered Jack 45 is also called an Ethernet cable. This cable can be straight or crossed depending on its use, its connections follow precise color codes. It is the most common cable for network connections for example to the Internet. This type of cable has 8 pins of electrical connections. Its connector is called 8P8C connector (8 positions and 8 electrical contacts). This connector is physically compatible to RS232 RS232 For a serial line information arrive at regular intervals (synchronous) or at random intervals (asynchronous). Between a transmitter (DTE) and a receiver (DCE) wiring is right. RS232 cables can be connected in series. In configurations where 2 DTE are directly connected, a cable of cross linking or \Null-Modem\ should be used. This cable has female connectors at each end. schemas :
Basic wiring RJ45 ----------------------------- DB25 4 (TXD) ----------------------------- 3 (RXD) 5 (RXD) ----------------------------- 2 (TXD) 6 (GND) ----------------------------- 7 (GND)
Wiring for printer RJ45 ---------------- DB25 4 (TXD) ---------------- 3 (RXD) 5 (RXD) ---------------- 2 (TXD) 6 (GND) ---------------- 7 (GND) 7 (CTS) ---------------- 20 (DTR)
conversion to type DB9 rs232 RJ45 Namely : The most common protocols are supported by the converters, including TCP - IP for Windows. The port must be set to optimize the speed of communication, otherwise it can be slow.
conversion to type DB25 rs232 RJ45 Adapters These adapters are cheap. We find them for sale on many web sites.
Wiring DB25 for pc RJ45 ----------------------------- PC DB25 3 (DSR) ----------------------------- 20 (DTR) 2 (RTS) ----------------------------- 5 (CTS) 4 (TXD) ----------------------------- 3 (RXD) 5 (RXD) ----------------------------- 2 (TXD) 6 (GND) ----------------------------- 7 (GND) 7 (CTS) ----------------------------- 4 (RTS) 8 (DTR) ----------------------------- 6 (DSR)
Wiring DB9 for pc RJ45 ----------------------------- PC DB9 3 (DSR) ----------------------------- 4 (DTR) 2 (RTS) ------------------------------ 8 (CTS) 4 (TXD) ------------------------------ 2 (RXD) 5 (RXD) ------------------------------ 3 (TXD) 6 (GND) ------------------------------- 5 (GND) 7 (CTS) ------------------------------ 7 (RTS) 8 (DTR) ------------------------------- 6 (DSR)