rs232 to rj45 cable connector converter pinout February 19, 2016 0 rs232 to rj45 cable connector converter pinout – I’m trying to figure out how this type of communication works: RJ45 (Ethernet) on one end, DB9 (RS232) on the other. On the RJ45 side, there’s TX+ and TX- (transmit) and RX+ and RX- (receive). Yet on the RS232 side, there’s only two wires (RX and TX). The rs232 to rj45 cables that on one side have DB9 (RS232) and on the other side have RJ45 are not doing any conversion whatsoever. They are just mapping each port on the DB9 (RS232) connector that has 8 pins to the 8 pins on the RJ45. If you connect that cable to a serial port on a computer and the other end to a router, they will not be able to communicate as they do not speak the same language. These are cables are similar to those that are USB to RJ45. Those cables cannot either communicate to standard devices like routers using RJ45 since they do not speak the same language. The truth is that they are still either a USB cable for the USBRJ45 or a DB9 for the rs232 to rj45 cable. The RJ45 is not truly an ethernet connection and the other device you connect at the other end, although they are using a RJ45 socket, they are truly either a USB port in the case of the USB-RJ45 cable or a serial port in the case of rs232 to rj45 cable. Here is figure a rs232 to rj45 cable connector converter pinout. rs232 to rj45 cable connector converter pinout The rs232 to rj45 cable converter careful here, there are several standards involved. Serial and ethernet are not directly convertible with an adapter cable, you need an active converter unit to bridge between the two. Lantronix are one of a number of companies specializing in those kind of interfaces. I suspect rather what you are looking at is serial on RJ45 cable which is commonly used on servers and networking infrastructure. You have regular serial signals but on an RJ45 cable. If you have + and – forms on the ACTUAL pin out of whatever port it is you are connecting to that suggests an alternative serial standard to RS-232 – RS423 is quite common since it will interface with both RS-422 and RS-232 – the “minus” connections are wired to the RS-232 ground to bridge between the two standards.