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Cannon D-subminiature — IEC 60807-3
D-subminiature, abbreviated D-sub, is a common series of electical connectors,
introduced by Cannon in 1952 and often used with computer-related equipment
[1]. The D-sub series is often eroneously referred to as Sub-D or D-Type.
Following Cannon's numbering scheme, the letter 'D' is used as a prefix for
all connectors of this series, whilst the second letter specifies the size.
The prefix is followed by a number that specifies the number of pins.
Historically, the 9-pin DE-9 was introduced after the
25-pin DB-25 (and in many cases replaced it, for example with serial ports),
and is therefore often wrongly labelled as DB-9,
ignoring the fact that 'E' denotes the size of the case shell.
The female part (socket) is known as DE-9S
and the male part (plug) is DE-9P.
With the original D-series, the pins are spaced 2.76 mm, whilst the rows are
2.84 mm apart, as shown in the drawing above. These parameters in defined in
the IEC 60807-3 and DIN 41652 standards.
There are also D-sub connectors with larger power conductors or coaxial inserts
in place of some of the regular contacts. In such cases this will be denoted
with a suffix, e.g.:
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- D-sub
- D-subminature
- DIN 41652
- IEC 60807-3
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- sub-D 1
- D-Type 1
- DB connector 1
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The names in red are frequently used but are actually incorrect.
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Below is the layout of several popular configurations, when looking
into the (female) socket.
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DA-15
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Shape A
Pins 15
Layout 8, 7
Usage Ethernet (10Base5)
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DC-37
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Shape C
Pins 37
Layout 19, 18
Usage SCSI, data/address bus
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DD-50
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Shape D
Pins 50
Layout 17, 16, 17
Usage SCSI
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Below is the pinout for the most common wiring today of an asynchronous
serial port (RS232). Commonly known as the Serial Port or COM-Port
is can be found on older personal computers, laptops and telecom equipment.
Adapters are available to convert between USB and RS232. The plug-version
(male) is used on Data Terminal Equipment (DTE), such
as a computer or terminal.
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DCD Data Carrier Detect RXD Receive Data TXD Transmit Data DTR Data Terminal Ready GND Ground DSR Data Set Ready RTS Request To Send CTS Clear To Send RI Ring Indicator
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The socket version (female) is commonly used on Data Circuit-Terminating Equipment
(DCE) and peripherals, such as modems.
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DCD Data Carrier Detect TXD Transmit Data RXD Receive Data DTR Data Terminal Ready GND Ground DSR Data Set Ready CTS Clear To Send RTS Request To Send RI Ring Indicator
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This is the oldest standard for RS232 on a computer equipment. It is also
known as V.24 and as RS232C, RS232D, RTS232E and TIA232F. It provides a full
serial port with modem signals for asynchronous serial communication,
and (optionally) a second port for synchronous communication.
Typical protocols used over synchronous V.24 are HDLC, X.25, SNA
and PPP. Below is the pinout for Data Terminal Equipment (DTE)
such as computers and terminals.
Note that not all signals are supported
by all equipment. In most cases only a subset is implemented.
The most important signals are shown in bold.
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GND Protective ground TXD Transmit Data RXD Receive Data RTS Request To Send CTS Clear To Send DSR Data Set Ready GND Signal ground DCD Data Carrier Detect - test pin - test pin - unused DCD 2 Data Carrier Detect (2) CTS 2 Clear To Send (2) TXD 2 Transmit Data (2) DCE Transmitter Clock RXD 2 Receive Data (2) RXC Receiver Clock - unused RTS 2 Request To Send (2) DTR Data Terminal Ready SQD Signal Quality Detector RI Ring Indicator DSRD Data Signal Rate Detector DCE Transmitter Clock - unused
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By convention, the plug-version (male) is used for a DTE, but there
are exceptions. For example: printers and tape punchers/readers are often
defined as DTE (using the pin definitions listed above), but are
nevertheless equipped with the socket-version (female) of the connector.
In that case, a gender-changer or a specially wired crossover (null-modem)
cable should be used.
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Below is the pinout of the RS232 port for
Data Circuit-Terminating Equipment (DCE) and peripherals,
such as modems. By convention, the socket-version (plug) is commonly used
on DCE. Note however that there are exceptions. Printers
and tape reader/punchers have a female connector (socket) but are nevertheless
wired as a DTE. In that case, a special cable is needed.
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GND Protective ground RXD Receive Data TXD Transmit Data CTS Clear To Send RTS Request To Send DTR Data Terminal Ready GND Signal ground DCD Data Carrier Detect - test pin - test pin - unused DCD 2 Data Carrier Detect (2) RTS 2 Request To Send (2) RXD 2 Receive Data (2) DCE Transmitter Clock TXD 2 Transmit Data (2) RXC Receiver Clock - unused CTS 2 Clear To Send (2) DSR Data Set Ready SQD Signal Quality Detector RI Ring Indicator DSRD Data Signal Rate Detector DCE Transmitter Clock - unused
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V.10 is a balanced variant of the RS-232 standard – defined in RS-530 –
intended for longer distances. It was used on teleprinter networks,
as an alternative to the existing AD04
and ADo8 standards, for example
with the TeKaDe FS-200 teleprinter.
Below is the pinout when looking into the plug.
When a signal is part of a twisted pair, the wire it is paired with
is shown in red in square brackets, like this [18]. The name of the
return wire is prefixed with a '/'. When unbalanced signals are used,
the return wires should be connected to ground (pin 7).
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GND Chassis [18] TXD Transmitted data (out) [14] RXD Received data (in) [16] RTS Request To Send (out) [19] CTS Clear To Send (in) [13] DSR Data Set Ready (in) [22] GND Signal ground [21] DCD Data Carrier Detect (in) [10] /RDS Return RX element timing (in) [17] /DCD Return DCD (in) [8] /TDT Return TX element timing DTE (out) [24] /TDS Return TX element timing DCE (in) [15] /CTS Return CTS (in) [5] /TXD Return TXD (out) [2] TDS TX element timing (in) [12] /RXD Return RXD (in) [3] RDS RX element timing (in) [9] LL Local Loopback (out) [1] /RTS Return RTS [4] DTR Data Terminal Ready (out) [23] RL Remote Loopback (out) [7] /DSR Return DSR (in) [6] /DTR Return DTR (out) [20] TDT TX element timing (out) [11] - Test Mode (in)
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V.21 is a standard for serial communication as used with the X.21 interface.
It was specified by CCITT in 1976 as a digital signalling interface between
the customer's Data Terminal Equipment (DTE) and the carrier's
Data Carrier Equipment (DCE). All signals are balanced as with RS-422.
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GND Shield TXD A Transmit data (A) CON A Control (A) RXD A Receive Data (A) IND A Indication (A) ST A Signal Timing (A) - unused GND Common TXD B Transmit Data (B) CON B Control (B) RXD B Receive Data (B) IND B Indication (B) ST B Signal Timing (B) - unused - unused
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Below is a regularly used pinout for using RS-422 over a DE-9 connector.
Note that Sony equipment uses a different layout (see below).
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- TXD-
- TXD+
- RTS-
- RTS+
- GND
- RXD-
- RXD+
- CTS-
- CTS+
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Sony 9-pin protocol — master
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Below is the pinout for RS-422 communication as defined by Sony for
Master devices. This pinout was widely used in the 1980s and 90s on
professional broadcast equipment, and is still used today with harddisc
and solid state video recorders. It is being replaced by Ethernet.
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- Ground (chassis)
- RX A
- TX B
- TX Common
- Spare or Ground
- RX Common
- RX B
- TX A
- Ground (chassis)
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Sony 9-pin protocol – slave
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Below is the pinout for RS-422 communication as defined by Sony for
Slave devices. This pinout was widely used in the 1980s and 90s on
professional broadcast equipment, and is still used today with harddisc
and solid state video recorders. It is being replaced by Ethernet.
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- Ground (chassis)
- TX A
- RX B
- RX Common
- Spare or Ground
- TX Common
- TX B
- RX A
- Ground (chassis)
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Below is the pinout of the 15-pin DE-15 used on the VGA, SVGA and XGA
cards of a Personal Computer (PC) and on the accompanying monitor. The computer
had a DE-15S receptacle. The monitor had a fixed cable or a DE-15S receptacle,
in which case a 1:1 male/male cable could be used. The ID0-ID3 lines are
used for identification of the monitor, but are often omitted.
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- Red
- Green
- Blue
- ID2
- GND
- GND Red
- GND Green
- GND Blue
- key (no pin)
- GND Sync
- ID0
- ID1 or SDA
- H-Sync or C-Sync
- V-Sync
- ID3 or SCL
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Philips CM8833 RGB analogue
DE-9
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- GND
- GND
- Red
- Green
- Blue
- Fast blanking
- Composite sync
- H sync
- V sync
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Philips CM8833 RGB TTL
DE-9
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- GND
- GND
- Red
- Green
- Blue
- Intensity
- unused
- H sync
- V sync
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STR Strobe (in/out) D0 Data bit 0 D1 Data bit 1 D2 Data bit 2 D0 Data bit 3 D4 Data bit 4 D5 Data bit 5 D6 Data bit 6 D7 Data bit 7 ACK Acknowledge BSY Busy PE Paper Out SI Select In AF Auto linefeed ERR Error INIT Reset SO Select Out GND Signal ground GND Signal ground GND Signal ground GND Signal ground GND Signal ground GND Signal ground GND Signal ground GND Signal ground
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© Crypto Museum. Created: Friday 02 April 2021. Last changed: Tuesday, 14 January 2025 - 11:19 CET.
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