8/4/2023 0 Comments Db9 serial port pinoutThe computer will then use pin 4 (DTR - Data Terminal Ready) and pin 6 (DSR – Data Set Ready) to create a handshake between the computer and modem. The modem will use pin 1 (CD – Carrier Detect) to tell the computer that there is a carrier tone detected or it has made a connection with a second modem. It is important to understand the purpose of each connection for troubleshooting serial connections. The above tables and wiring diagram outlines the required connections to create a loop back plug.
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