E324 · Source-scoped pinout variants

DE-9 D-sub (commonly called DB9) engineering reference

Named wiring from the pinout research; connector shape alone does not establish capabilities.

Open field note Source trail

Source checked · no independent review claimed · Fabrication approved: no

DE-9 D-sub (RS-232 DTE and other uses) engineering reference original orientation schematic — Original pinout diagram; read the exact variant and view below. Not to scale.

Contact count

Not asserted

Source-scoped connector interface

Mating boundary

Shape is not the verdict.

Check the exact device and mating connector.

Orientation

How to read this profile

Read the exact variant view convention. Schematic layouts do not establish physical positions.

Source-scoped identification facts

Each value retains its exact example, role and measurement axis. Facts from different parts must not be combined into an invented component.

Documented examples; not a mating drawing or compatibility approval
Nominal contacts	9S092Nine nominal positions; the guide cautions that some D-sub connectors do not populate every contact.
Positions / cavity span	9 (Claim C114A); 9 (Claim C114C)S092 · S625Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. Identification and explicitly scoped documentation only; not an end-to-end connection approval Exact component role and mounting only; this is not an identification of the service on a complete device.
Contact rows	2 (Claim C114C); 2 (5747840-6)S625 · S625Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. TE identifies 5747840-6 as a nine-position, two-row plug mounted at right angles to a printed circuit board. \| Exact component role and mounting only; this is not an identification of the service on a complete device. 5747840-6. Documented role: plug. Exact named part only. Product specification is not a specimen measurement or interoperability approval.
Contact pitch	2.74 mm centerline (5747840-6)S625Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. 5747840-6. Documented role: plug. Exact named part only. Product specification is not a specimen measurement or interoperability approval.
Dimensions / axis	2.84 mm row-to-row spacing (5747840-6)S625Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. 5747840-6. Documented role: plug. Exact named part only. Product specification is not a specimen measurement or interoperability approval.
Connector role	plug (5747840-6)S625Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. 5747840-6. Documented role: plug. Exact named part only. Product specification is not a specimen measurement or interoperability approval.
Mounting	Fixed female screwlocks; boardlock PCB retention; right-angle boardmount (5747840-6)S625Not recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations. 5747840-6. Documented role: plug. Exact named part only. Product specification is not a specimen measurement or interoperability approval.
Manufacturer	TE Connectivity (5747840-6)S625Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. 5747840-6. Documented role: plug. Exact named part only. Product specification is not a specimen measurement or interoperability approval.
Series	AMPLIMITE HD-20 (5747840-6)S625Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. 5747840-6. Documented role: plug. Exact named part only. Product specification is not a specimen measurement or interoperability approval.
Exact part / implementation	5747840-6 (5747840-6)S625Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. 5747840-6. Documented role: plug. Exact named part only. Product specification is not a specimen measurement or interoperability approval.

Not recorded: Populated contacts, Contact gender / arrangement, Coupling / latch, Keying / polarization, Shell / form, Recorded markings, View convention. Unknown fields stay unknown; illustrations supply no measurements or pin assignments.

Recorded variant and source limits

Check the exact device manual before wiring or applying power.
IBM Personal Computer AT Serial/Parallel Adapter serial port (DTE), 9-pin D-shell: Contact numbers as in IBM figure (the figure shows the adapter connector with 1-5 and 6-9 rows); arrows give signal direction relative to the adapter.
PC DTE 9-pin serial interface (TI SLLA037A): D-sub contact numbers 1-9 as moulded. TI: DTE is a male-pin connector (female housing per TI's wording); no face-view orientation is transferred.
SGI O2 serial ports 1 and 2 (DB9): D-sub contact numbers 1-9 as moulded. TI: DTE is a male-pin connector (female housing per TI's wording); no face-view orientation is transferred.
Doug Fleenor Design 2322DMX front-panel DB-9M RS-232 port (device-specific): D-sub contact numbers 1-9 as moulded. TI: DTE is a male-pin connector (female housing per TI's wording); no face-view orientation is transferred.
Screwlocks/boardlocks/boardmount are retention and mounting evidence, not mating polarization. Recorded source context: Fixed female screwlocks; boardlock PCB retention; right-angle boardmount / 5747840-6

Report a correction to these facts →

Pins & wiring

Pinout

Choose the exact wiring. Pin numbers follow its stated view; a schematic does not establish physical positions. Check your exact device before wiring.

Dark pinout view

What the status labels mean

Confirmed: Recorded research passes agree within this variant; this is not independent human review or hardware validation.
Single source: Only one underlying document, or one pass, supports this assignment.
Device-specific: Supported for the named equipment or wiring only. Check your device’s manual.
Unverified: Missing or conflicting evidence. Do not wire from this row.
Not connected: The source explicitly says NC, no contact or no pin for this wiring.

Wiring variantIBM Personal Computer AT Serial/Parallel Adapter serial port (DTE), …

IBM Personal Computer AT Serial/Parallel Adapter serial port (DTE), 9-pin D-shell

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

Contact numbers as in IBM figure (the figure shows the adapter connector with 1-5 and 6-9 rows); arrows give signal direction relative to the adapter.

P114 DE-9 (RS-232 DTE) — **Agree** on all 9 (1 DCD, 2 RxD, 3 TxD, 4 DTR, 5 ground, 6 DSR, 7 RTS, 8 CTS, 9 RI) — A: IBM PC AT. B: TI SLLA037A and SGI O2.
TIA-232-F and TIA-574 (the 9-position DTE assignment) are paywalled and were not accessed; rows rely on IBM.
Not established.
CAN (CiA 303-1), Atari/Commodore joystick, CGA/EGA/MDA video, Profibus and other DE-9 uses were not established from primary documents in this pass.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

IBM Personal Computer AT Serial/Parallel Adapter serial port (DTE), 9-pin D-shell — source-scoped contact map
Pin	Signal	What it does	Status
1	Carrier Detect	Indicates a detected serial carrier.	Device-specific Sources
2	Receive Data	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
3	Transmit Data	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
4	Data Terminal Ready	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
5	Signal Ground	Control, detection or configuration connection; check the source and device.	Device-specific Sources
6	Data Set Ready	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
7	Request To Send	Control, detection or configuration connection; check the source and device.	Device-specific Sources
8	Clear To Send	Control, detection or configuration connection; check the source and device.	Device-specific Sources
9	Ring Indicator	Control, detection or configuration connection; check the source and device.	Device-specific Sources

Sources (1)

S736 · IBM · Personal Computer AT Technical Reference (1502494)
First Edition (March 1984) · IBM Personal Computer AT Serial/Parallel Adapter section, printed p. 18, 'Pin Assignment for Serial Port' figure (with connector drawing, pins 1-5 / 6-9)

PC DTE 9-pin serial interface (TI SLLA037A)

View and evidence limits

D-sub contact numbers 1-9 as moulded. TI: DTE is a male-pin connector (female housing per TI's wording); no face-view orientation is transferred.

P114 DE-9 (RS-232 DTE) — **Agree** on all 9 (1 DCD, 2 RxD, 3 TxD, 4 DTR, 5 ground, 6 DSR, 7 RTS, 8 CTS, 9 RI) — A: IBM PC AT. B: TI SLLA037A and SGI O2.
TIA-232-F and EIA/TIA-574 are paywalled and were not read; the DTE variant rests on TI and SGI manufacturer documents.
Not listed in the manual; neither connection nor non-connection is established.
DCE-side (modem) pinouts, CAN (CiA 303-1), game/joystick, video (CGA/EGA) and proprietary uses were not established in this pass.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

PC DTE 9-pin serial interface (TI SLLA037A) — source-scoped contact map
Pin	Signal	What it does	Status
1	DCD	Indicates a detected serial carrier.	Single source Sources
2	RD	Control, detection or configuration connection; check the source and device.	Single source Sources
3	TD	Control, detection or configuration connection; check the source and device.	Single source Sources
4	DTR	Control, detection or configuration connection; check the source and device.	Single source Sources
5	Signal Ground	Control, detection or configuration connection; check the source and device.	Confirmed Sources
6	DSR	Control, detection or configuration connection; check the source and device.	Single source Sources
7	RTS	Requests permission to send serial data.	Single source Sources
8	CTS	Indicates permission to send serial data.	Single source Sources
9	RI	Control, detection or configuration connection; check the source and device.	Single source Sources

Sources (2)

S737 · Texas Instruments · Interface Circuits for TIA/EIA-232-F (Design Notes)
SLLA037A, September 2002 · p. 7, 'The DB9S Connector' and Figure 6 '232 DB9S Interface'; p. 8, signal descriptions incl. 'Signal Ground (pin 5)'; p. 9, Figure 7 '232 Null Modem' pin labels
S736 · IBM · Personal Computer AT Technical Reference (1502494)
First Edition (March 1984) · IBM Personal Computer AT Serial/Parallel Adapter section, printed p. 18, 'Pin Assignment for Serial Port' figure (with connector drawing, pins 1-5 / 6-9)

SGI O2 serial ports 1 and 2 (DB9)

View and evidence limits

D-sub contact numbers 1-9 as moulded. TI: DTE is a male-pin connector (female housing per TI's wording); no face-view orientation is transferred.

P114 DE-9 (RS-232 DTE) — **Agree** on all 9 (1 DCD, 2 RxD, 3 TxD, 4 DTR, 5 ground, 6 DSR, 7 RTS, 8 CTS, 9 RI) — A: IBM PC AT. B: TI SLLA037A and SGI O2.
TIA-232-F and EIA/TIA-574 are paywalled and were not read; the DTE variant rests on TI and SGI manufacturer documents.
Not listed in the manual; neither connection nor non-connection is established.
DCE-side (modem) pinouts, CAN (CiA 303-1), game/joystick, video (CGA/EGA) and proprietary uses were not established in this pass.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

SGI O2 serial ports 1 and 2 (DB9) — source-scoped contact map
Pin	Signal	What it does	Status
1	DCD	Indicates a detected serial carrier.	Single source Sources
2	RD	Control, detection or configuration connection; check the source and device.	Single source Sources
3	TD	Control, detection or configuration connection; check the source and device.	Single source Sources
4	DTR	Control, detection or configuration connection; check the source and device.	Single source Sources
5	SG	Control, detection or configuration connection; check the source and device.	Single source Sources
6	DSR	Control, detection or configuration connection; check the source and device.	Single source Sources
7	RTS	Requests permission to send serial data.	Single source Sources
8	CTS	Indicates permission to send serial data.	Single source Sources
9	RI	Control, detection or configuration connection; check the source and device.	Single source Sources

Sources (2)

S725 · Silicon Graphics · Silicon Graphics O2 Workstation Hardware Reference Guide
Document Number 007-3275-004 (HTML edition) · Appendix A, Table A-1 'Serial Port Pinout Assignments'
S738 · Silicon Graphics · Silicon Graphics O2 Workstation Hardware Reference Guide
Document Number 007-3275-004 (HTML edition) · Chapter 3, 'Connecting Serial Devices' ('The serial ports are labeled 1 and 2 and are DB9 connectors') - ch03.html

Doug Fleenor Design 2322DMX front-panel DB-9M RS-232 port (device-sp…

Doug Fleenor Design 2322DMX front-panel DB-9M RS-232 port (device-specific)

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

D-sub contact numbers 1-9 as moulded. TI: DTE is a male-pin connector (female housing per TI's wording); no face-view orientation is transferred.

P114 DE-9 (RS-232 DTE) — **Agree** on all 9 (1 DCD, 2 RxD, 3 TxD, 4 DTR, 5 ground, 6 DSR, 7 RTS, 8 CTS, 9 RI) — A: IBM PC AT. B: TI SLLA037A and SGI O2.
Only pins 2, 3 and 5 are listed by DFD; pins 1, 4, 6, 7, 8, 9 are not stated (see unverified).
A declared contact lacks a cited assignment and is shown as unverified.
TIA-232-F and EIA/TIA-574 are paywalled and were not read; the DTE variant rests on TI and SGI manufacturer documents.
Not listed in the manual; neither connection nor non-connection is established.
DCE-side (modem) pinouts, CAN (CiA 303-1), game/joystick, video (CGA/EGA) and proprietary uses were not established in this pass.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

Doug Fleenor Design 2322DMX front-panel DB-9M RS-232 port (device-specific) — source-scoped contact map
Pin	Signal	What it does	Status
1	Not confirmed	No settled assignment. Do not wire from this row.	Unverified
2	Receive data	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
3	Transmit data	Signal conductor. Pair, polarity and direction follow this named wiring.	Device-specific Sources
4	Not confirmed	No settled assignment. Do not wire from this row.	Unverified
5	Common	Control, detection or configuration connection; check the source and device.	Device-specific Sources
6	Not confirmed	No settled assignment. Do not wire from this row.	Unverified
7	Not confirmed	No settled assignment. Do not wire from this row.	Unverified
8	Not confirmed	No settled assignment. Do not wire from this row.	Unverified
9	Not confirmed	No settled assignment. Do not wire from this row.	Unverified

Sources (1)

S739 · Doug Fleenor Design · RS-232 to DMX512 Interface, 3rd Generation, model 2322DMX (manual V.2)
September 2021 (Software V2.0), for serial number 223148 and higher · p. 1, 'Connections', 'The front panel DB-9M connector pinout is' table

Unknowns stay unknown.

Check the exact device manual before wiring or applying power.

Your next step

Use the detail without guessing past its limits.

Read the connector field note Recognition clues and practical checks.Work through a connection Keep exact equipment and cable requirements separate.

Source trail

Claims and sources

C804Nsource checked

IBM Personal Computer AT Serial/Parallel Adapter serial port (DTE), 9-pin D-shell: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

IBM · Personal Computer AT Technical Reference (1502494) ↗
IBM Personal Computer AT Serial/Parallel Adapter section, printed p. 18, 'Pin Assignment for Serial Port' figure (with connector drawing, pins 1-5 / 6-9); IBM Personal Computer AT Serial/Parallel Adapter section, printed p. 23, 'Parallel Interface' figure (signals, directions, pins 1-25); Serial/Parallel Adapter section, printed p. 1: rear 9-pin D-shell 'classified as an RS-232C port' · Source scope and unresolved evidence are preserved in the engineering variant.

C804Osource checked

PC DTE 9-pin serial interface (TI SLLA037A): original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Texas Instruments · Interface Circuits for TIA/EIA-232-F (Design Notes) ↗
p. 7, 'The DB9S Connector' and Figure 6 '232 DB9S Interface'; p. 8, signal descriptions incl. 'Signal Ground (pin 5)'; p. 9, Figure 7 '232 Null Modem' pin labels · Source scope and unresolved evidence are preserved in the engineering variant.

C804Psource checked

SGI O2 serial ports 1 and 2 (DB9): original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Silicon Graphics · Silicon Graphics O2 Workstation Hardware Reference Guide ↗
Appendix A, Table A-1 'Serial Port Pinout Assignments'; Appendix A, Table A-2 'Parallel Port (IEEE 1284-C) Pinout Assignments'; Appendix A, Table A-4 'Keyboard and Mouse Ports (6-pin MINIDIN) Pinout Assignments' · Source scope and unresolved evidence are preserved in the engineering variant.

Silicon Graphics · Silicon Graphics O2 Workstation Hardware Reference Guide ↗
Chapter 3, 'Connecting Serial Devices' ('The serial ports are labeled 1 and 2 and are DB9 connectors') - ch03.html · Source scope and unresolved evidence are preserved in the engineering variant.

C804Qsource checked

Doug Fleenor Design 2322DMX front-panel DB-9M RS-232 port (device-specific): original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Doug Fleenor Design · RS-232 to DMX512 Interface, 3rd Generation, model 2322DMX (manual V.2) ↗
p. 1, 'Connections', 'The front panel DB-9M connector pinout is' table; p. 1, 'Connections', 'The pinout for the 5 pin XLR connectors is' table · Source scope and unresolved evidence are preserved in the engineering variant.

5 source records support this profile. No independent engineering review or hardware validation is claimed.

Evidence behind this page

Scope first. Source second. Approval separate.

5 linked sources · 4 scoped claims · 0 sources with inspection/access flags.

Page scope: Original schematic; not to scale and not fabrication approval.

Assessment 2026-10-22 · earliest scheduled source review 2027-01-18. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 5 source scopes, access limits and dates