What is RS232 and Serial Communications? | TALtech
25 Pin Connector on a DTE device (PC connection) Male RS232 DB25 Pin Number Direction of signal: 1 Protective Ground 2 Transmitted Data (TD) Outgoing Data (from a DTE to a DCE) 3 Received Data (RD) Incoming Data (from a DCE to a DTE) 4 Request To ......