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erial port (RS-232 DE9) pinout and wiring @ pinouts.ru

//pinouts.ru/SerialPorts/Serial9_pinout.shtml[6/3/2011 4:20:06 PM]

PC serial port (RS-232 DE9) connector pinout serial in

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9 pin D-SUB

male connector

at the computer

This RS232C DE-9 (usually miscalled DB-9) port is very common and

available at almost any PC, some Sun (at least Ultra 5/ 10, Blade

100/150) and many other computers. Document includes description

of how PC serial mouse works.

Almost each PC nowdays equiped with one/two/four serial interface

(RS232C). This PC serial port interface is single ended (connects only two

devices with each other), the data rate is less than 20 kbps. It's a 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.

DB-9

Pin

IDC

internal

pin

name*

Name Dir Description

1 1 CD CarrierDetect

2 3 RXD Receive Data

3 5 TXDTransmit

Data

4 7 DTR

Data

Terminal

Ready

5 9 GNDSystem

Ground

6 2 DSRData Set

Ready

7 4 RTSRequest to

Send

8 6 CTSClear to

Send

9 8 RIRing

Indicator

Note: Direction is DTE (Computer) relative DCE (Modem)

* Pin assignment of internal connector may be different for different

motherboard models. Pin 10 removed in connector. Internal IDC connnector

wired to external port with a simple flat ribbon cable.

PC serial port pinout signals explanations

Since PC serial port is based on RS-232 standard, you may find signal

details in the RS-232 interface pinoutdocument

Standard RS232 data packet

10 pin IDC male conne

at the inside, at

motheboard

Modbus TCP-

RTU Router

Access Modbus

RTU devices

from TCP/IP

networks.www.cimetrics.com/M
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RS232 data usually is 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 +15v) followed by data bits, parity bit

(depends on protocol used) and finished by stop bit (used to bring logic high,

usually between -3v and -15v).

Sample RS232 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 (typically optomechanical)

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. The mouse driver in the computer received that data packet and

decodes the information from it and does actions based on the information.

PC RS232 serial mouse voltage levels:

Mouse takes standard RS-232C output signals (+-12V) as its input signals.

Those outputs are in +12V when mouse is operated. Mouse takes some

current from each of the RS-232C port output lines it is connected (about

10mA). Mouse send data to computer in levels that RS-232C receiver chip

in the computer can uderstand as RS-232C input levels. Mouse outputs are

normally something like +-5V, 0..5V or sometimes +-12V. Mouse electronics

normally use +5V voltage.

Serial device hardware implementation

PC serial mouse uses typically DTR and RTS lines for generating +5V

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 10 mA

total current and operates at voltage range of 6-15V. The data itself in sent

using standard asynchronous RS-232C serial format:

St ar t D0 D1 D2 D3 D4 D5 D6 D7 St op

Logi c 0 ___ ___ ___ ___ ___ ___ ___ ___ ___

+3. . +15V | | | | | | | | | |


3/4



| | | | | | | | | |

| | | | | | | | | |

Logi c 1 | | | | | | | | | |

- 3. . - 15V ___ | | ___ | ___ | ___ | ___ | ___ | ___| ___ | ___| ____

Serial mouse pinout explanation

Pin Signal Description

shellProtectiveGround

3 TD

Serial data from

host to mouse

(only for power)

2 RDSerial data from

mouse to host

7 RTSPositive voltage to

mouse

8 CTS

6 DSR

5Signal

Ground

4 DTR

Positive voltage to

mouse and

reset/detection

RTS = Request to Send CTS = Clear to Send DSR = Data Set Ready DTR

= Data Terminal Ready

When DTR line is toggled, mouse should send one data byte containing

letter M (ascii 77) to identify itself. 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 100ms.

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.

RS232 serial data parameters and packet format

1200bps, 7 databits, 1 stop-bit

Data packet is 3 byte packet. It is send to the computer every time mouse

state changes (mouse moves or keys are pressed/released).

D7 D6 D5 D4 D3 D2

D1 D0


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//pinouts ru/SerialPorts/Serial9 pinout shtml[6/3/2011 4:20:06 PM]

1. X 1 LB RB Y7 Y6

X7 X6

2. X 0 X5 X4 X3 X2

X1 X0

3. X 0 Y5 Y4 Y3 Y2

Y1 Y0

Note: The bit marked with X is 0 if the mouse received with 7 databits and 2

stop bits format. 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. is send first, then the others. 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)

Is there anything to be corrected? Edit this page!

Related pinouts :

PC serial (25 pin) pino

RS232 interface pinou

urce(s) of this and additional information: partially by Tomi Engdahl

nouts.ru> RS-232 and other serial ports and interfaces pinouts listing > Pinout of PC serial port (RS-232 DE9) and layout

9 pin D-SUB male connector and 10 pin IDC male connector. Is this document correct or incorrect? Is it correct?:

sh

bcor

10 commentsast updated 2010-04-24 14:52:27. Edit this page.

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