Connection problem with RS485 system on PC with RS232 port
This taximeter gives output according to RS485 system. My application
  is on PC and I want to receive signal from this taximeter. My PC can
  read data from RS232 cable. I have RS232 cable so I have connected the
  RX and TX of taximeter to TX and Rx of cable.


RS485 is not compatible with RS232 hardware wise at all. RS485 uses a balanced, differential 2-wire or 4-wire transmission/reception circuit. RS232 uses single ended transmit and receive wires (and ground) and has no facility to accept 485 without a 485 converter.