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Sunday, 08 July 2007 |
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On a PC the serial port is a 9 way male D. The table below gives the pin out and approx voltage level and flow direction of the RS232 signal.  
| Signal Name | DB9 pin no. | Direction
-> From PC
<- To PC | Voltage level when port is Closed Open | | DCD (Data Carrier Detect) | 1 | <- | | | RX (Receive Data) | 2 | <- | | | TX (Transmit Data) | 3 | -> | < -6v | | | DTR (Data Terminal Ready) | 4 | -> | < -6v | > +6v | | GND (Signal Ground) | 5 | | | | DSR (Data Set Ready) | 6 | <- | | | RTS (Request To Send) | 7 | -> | < -6v | > +6v | | CTS (Clear To Send) | 8 | <- | | | RI (Ring Indicator) | 9 | <- | |
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