#Rj45 loopback cable serial#

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For example, the positive transmit-data line connects to the positive receive-data line and the negative to negative. Each of these pairs must be connected to their corresponding pairs for a loopback test. The CTS and RTS hardware handshaking signals are also paired in this manner. RS 422 and RS 485 use a pair of differential signals for transmit-data and another pair for receive-data.

#Rj45 loopback cable serial#

RS 422 serial connections were used on AppleВ® computers prior to the adoption of the Universal Serial Bus (USB). The Data Terminal Ready (DTR) line should also be wired to the Data Set Ready (DSR) line. For example, the Clear To Send (CTS) line can be wired to the Request To Send (RTS) line.

A more thorough test can be performed by adding a few hardware handshaking signals to the connection. The simplest form of a Recommended Standard (RS) 232 serial loopback test can be done this way using a standard serial connector. The loopback device can be as simple as a wire routing the transmit-data line to the receive-data line.