TABLE OF CONTENTS RS-232 is the most known serial port used in transmitting the data in communication and interface. Even though a serial port is harder to program than the parallel port, this is the most effective method in which the data transmission requires fewer wires and less cost. The RS-232 is the communication line which enables data transmission by only using three wire links. The three links provide transmit, receive, and common ground.
The transmit and receive line on this connecter send and receive data between the computers. As the name indicates, the data is transmitted serially. The two pins are TXD & RXD. There are other lines on this port such as RTS, CTS, DSR, DTR, and RTS, RI. The 1 and 0 are the data which defines a voltage level of 3 V to 25 V and -3 V to -25 V respectively.
The electrical characteristics of the serial port as per the EIA ( Electronics Industry Association) RS-232C Standard specifies a maximum baud rate of 20,000bps, which is slow compared to today s standard speed. For this reason, we have chosen the new RS-232D Standard, which was recently released.
The RS-232D has existed in two types, i.e., D-Type 25-pin connector and D-Type 9-pin connector, which are male connectors on the back of the PC. You need a female connector on your communication from host to guest computer. The pin outs of both D-9 & D-25 are shown in Table 3.10.
| D-type 9- pin... |
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