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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 | | | | | | | | | |
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| | | | | | | | | |
| | | | | | | | | |
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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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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