PC serial port (RS- 2. DE9) pinout diagram @ pinouts. The RS- 2. 32 (also called serial, COM port) is still a common interface and most PCs are still equipped with serial interface (RS2. C) connector. This PC serial port interface is single ended (interconnect two devices only, via RS2. RS2. 32 is the voltage loop serial interface with full- duplex communication represented by voltage levels with respect to system ground. A common ground between the PC and the associated device is necessary. Hot- plug isn't supported, but sometimes allowed. Note: Direction is DTE (Computer) relative DCE (Modem)Nowdays RS2. PC serial port is often hidden and presented as the RS2. PC serial port pinout signals. Since PC serial port is based on RS- 2. RS- 2. 32 interface pinout document. Standard RS2. 32 data packet. RS2. 32 data is usually sent as a packet with 7 or 8 bit words, start, stop, parity bits (may be varied). Sample transmission shown on picture: Start bit (active low, usually between +3v and +1. Sample RS2. 32 serial port device. How serial mouse works. Typical PC mouse controlling system has the following parts: sensors - > mouse controller - > communication link - > data interface - > driver - > software. Sensors are the movement detectors which sense the mouse movement and button swiches which sense the button states. Mouse controller reads the state of those sensors and takes acount of current mouse position. When this information changes the mouse controller sends a packet of data to the computer serial data interface controller. Virtual Serial Port ActiveX Create and fully control virtual serial port. Full software emulation of real serial port: Full baud rate emulation : Emulate connection line break : Set custom signal lines wiring for DTS, RTS, DSR, CTS, DCD, RING signals: Enumerate Virtual Serial Ports: Possibility to. Note: DCD can be sometimes labeled as CD. Hardware flow control: RTS/CTS and DTR/DSR. If devices RTS and CTS or DTR and DSR pins are coonnected then it means that the 'hardware' flow control can be used. Serial-to-Ethernet Device Servers 3 www.moxa.com Dimensions Unit: mm (inch) Pin Assignment PIN RS-232 1 DCD 2 RxD 3 TxD 4 DTR 5 GND 6 DSR 7 RTS 8 CTS 9 – NPort Serial cable schematics and wiring diagrams. Serial and Parallel cable schematics and wiring diagrams. Use the I/O ActiveX control for serial and parallel communication. The mouse driver in the computer received that data packet and decodes the information from it and does actions based on the information. PC RS2. 32 serial mouse voltage levels: Mouse takes standard RS- 2. C output signals (+- 1. V) as its input signals. Those outputs are in +1. V when mouse is operated. Mouse takes some current from each of the RS- 2. C port output lines it is connected (about 1. A). Mouse send data to computer in levels that RS- 2. C receiver chip in the computer can uderstand as RS- 2. C input levels. Mouse outputs are normally something like +- 5. V, 0. 5. V or sometimes +- 1. V. Mouse electronics normally use +5. V voltage. Serial device hardware implementation. PC serial mouse uses typically DTR and RTS lines for generating +5. V power for microcontroller circuit in the mouse. Because typical optomechanical mouse also needs power for 4 leds in the optocoupler movevement detectors, there is not much power to loose. A typical approach is to use diodes to take current from DTR and RTS lines and then feed it through resistor to all of the (infrared) leds in the movement detectors. The positive power supply usually taken from RTS and DTR lines (just after the diodes and before the resistor going to leds). The negative supply for transmitter is taken from TD pin. Typical PC serial port mouse takes 1. A total current and operates at voltage range of 6- 1. V. The data itself in sent using standard asynchronous RS- 2. C serial format. Start D0 D1 D2 D3 D4 D5 D6 D7 Stop. Logic 0 . To function correctly, both the RTS and DTR lines must be positive. The lines DTR- DSR and RTS- CTS must NOT be shorted. Implement the RTS toggle function by setting the RTS line negative and positive again. The negative pulse width is at least 1. After a cold boot, the RTS line is usually set to a negative level. In this case, setting the RTS line to a positive level is also considered an RTS toggle. RS2. 32 serial data parameters and packet format. Data packet is 3 byte packet. It is send to the computer every time mouse state changes (mouse moves or keys are pressed/released). It is also possible to use 8 databits and 1 stop bit format for receiving. In this case X gets value 1. The safest thing to get everything working is to use 7 databits and 1 stopbit when receiving mouse information (and if you are making mouse then send out 7 databits and 2 stop bits). The byte marked with 1. The bit D6 in the first byte is used for syncronizing the software to mouse packets if it goes out of sync. LB is the state of the left button (1 means pressed down); RB is the state of the right button (1 means pressed down); X7- X0 movement in X direction since last packet (signed byte); Y7- Y0 movement in Y direction since last packet (signed byte).
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