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Marns CDA Reference &
Resources
PC Wiring Pin Out
/ Diagrams
Network Wiring Pin Out
Referenced from http://www.pronet.no/sverre/wires/colors.html
T-568 and Telephone Color Codes
Telephone Cable
RJ-11 Plug Wiring
This is
the wiring for the plug side of an RJ-11 connector. Can you say "BRGY"? (Think
about cheap red wine; I know I do.) The diagram is shown with the "hook" - the
little thing you press on to get the plug out - underneath. RJ-11 sockets always
have the colors indicated on the terminals.
Note that the connector on the other end of an RJ-11 connector
is wired in reverse order. That is, if you stretch the cable out flat,
the Black wire stays on the left all the way to the other end, including through
the connector with the hook oriented down also. Also note that the RJ-11
connector has six terminals on it. Only the middle 4 are normally used. Line 1
is the center pair: red and green, as in Christmas.
T-568B Color Code for RJ-45 Plug
Eight-conductor data cable contains 4
pairs of wires. Each pair consists of a solid (or predominantly) colored wire
and a white wire with a stripe of the same color. The pairs are twisted
together. To maintain reliability on Ethernet, you should not untwist them any
more than necessary (like about 1 cm).
There are two wiring standards for these cables, called "T-568A"
and T-568B" They differ only in connection sequence, not in use of the various
colors. The illustration shown is for T-568B. The pairs designated for 10BaseT
Ethernet are Orange and Green. The other two pairs, Brown and Blue, can be used
for a second Ethernet line or for phone connections.
Note that the Blue pair is on the center pins and conveniently
corresponds to the Red and Green pair in a normal phone line. The connections
shown are specifically for an RJ45 plug (the thing on the end of the wire). The
wall jack may be wired in a different sequence because the wires are actually
crossed inside the jack. The jack should either come with a wiring diagram or at
least designate pin numbers that you can match up to the color code below.
Pin Number Designations
There are pin number designations for each
color in T568B as well. The pin designations are as follows: Color Codes for T568B
Pin color pair name
--- ----- ---- ---------
1 wh/or 2 TxData +
2 or 2 TxData -
3 wh/grn 3 RecvData+
4 blu 1
5 wh/blu 1
6 grn 3 RecvData-
7 wh/brn 4
8 brn 4
Note
that the odd pin numbers are always the white with stripe color.
Info found at http://www.pronet.no/sverre/wires/colors.html
Wiring Diagrams for Straight Through, Cross Over and Y
cables
Note: The hook is underneath in all cases and Pin one is
always on the Left
| Straight Through Cable |
Color Code |
Color |
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin
7
Pin 8 |
white orange
orange
white green
blue
white blue
green
white brown
brown |
 |
| Cross Over Cable |
Color Code |
Color |
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin
7
Pin 8 |
white green
green
white orange
blue
white blue
orange
white brown
brown |
|
| The other side is a straight through cable see Straight through
diagram |
Straight-Through vs Cross-Over
In general, the patch cords that you use
with your Ethernet connections are "straight-through", which means that pin 1 of
the plug on one end is connected to pin 1 of the plug on the other end (for
either standard). The only time you cross connections in 10BaseT is when you
connect two Ethernet devices directly together without a hub or connect two hubs
together. Then you need a "cross-over" patch cable, which crosses the transmit
and receive pairs. An easy way remember how to make a cross-over cable is to
wire one end with the T-568A standard and the other with the T-568B standard.
Termination
UTP cables are terminated with standard connectors, jacks and punchdowns. The
jack/plug is often referred to as a "RJ-45", but that's a telco
designation for the "modular 8 pin connector" terminated with a USOC pinout used
for telephones. The male connector on the end of a patchcord is called a "plug"
and the receptacle on the wall outlet is a "jack."
In LANs, as spec'ed by 568, there are two possible pinouts, called T568A and
T568B, that differ only in which color coded pairs are connected - pair 2 and 3
are reversed. Either work equally well, as long as you don't mix them! If you
always use only one version, you're OK, but if you mix A and B in a cable run,
you will get crossed pairs!
The cable pairs are color coded as
Pair 1 is white-blue/blue,
Pair 2 white-orange/orange,
Pair 3 is
white-green/green
Pair 4 is white-brown/brown.
RS232 Connections, and wiring up serial devices
Referenced from
RS232 Pin Assignments (DB25 PC signal set)
| Pin 1 |
Protective Ground |
| Pin 2 |
Transmit Data |
| Pin 3 |
Received Data |
| Pin 4 |
Request To Send |
| Pin 5 |
Clear To Send |
| Pin 6 |
Data Set Ready |
| Pin 7 |
Signal Ground |
| Pin 8 |
Received Line Signal Detector
(Data Carrier Detect) |
| Pin 20 |
Data Terminal Ready |
| Pin 22 |
Ring Indicator |
The connector on the PC
has male pins, therefore the mating
cable needs to terminate in a
DB25/F (Female pin) connector.
RS232 Pin Assignments (DB9 PC signal set)
| Pin 1 |
Received Line Signal Detector
(Data Carrier Detect) |
| Pin 2 |
Received Data |
| Pin 3 |
Transmit Data |
| Pin 4 |
Data Terminal Ready |
| Pin 5 |
Signal Ground |
| Pin 6 |
Data Set Ready |
| Pin 7 |
Request To Send |
| Pin 8 |
Clear To Send |
| Pin 9 |
Ring Indicator |
The connector on the PC
has male pins, therefore the mating
cable needs to terminate in a DB9/F
(Female pin) connector.
Wiring up something nice and simple, for instance a plain old "dumb
terminal", is just a matter of connecting Tx, Rx and Ground,
right?
Usually Not. While the normal PC hardware might well
run with just Tx, Rx and Ground connected, most driver software will wait
forever for one of the handshaking lines to go to the correct level.
Depending on the signal state it might sometimes work, other times it
might not. The reliable solution is to loop back the handshake lines if
they are not used.
Handshake looping a PC serial connector
When the lines are handshake looped, the RTS output from the PC
immediately activates the CTS input - so the PC effectively controls its
own handshaking.
RS232 DB9 PC Loopback test plug
The PC loopback plug is a useful diagnostic tool. The loopback plug
connects serial inputs to serial outputs so that the port may be tested.
There is more than one way to wire up a loopback plug - but this is the
most common.
RS232 DB25 PC Loopback test plug
Connecting together two serial devices involves connecting the Rx of
one device to the Tx of the other, and vice versa. The diagram below
indicates how you would go about connecting two PC's together, without
handshaking.
Connecting two PCs together using RS232, without
handshaking
When Handshaking is required, generally RTS of one device connects to
CTS of the other, and vice versa, and also DSR of one device connects to
DTR of the other device, and vice versa. The particular requirements for
different equipment may vary.
Connecting two PCs together using RS232, with
handshaking
Using a Breakout box or LED box to work out cabling
If you have
problem with RS232 cabling, your best "emergency" tool may be a breakout
box (sometimes called an LED box). Generally these units only come in the
DB25 size, but with a couple of DB9 to DB25 adaptors, they can be used
with DB9 cables as well. The units have an LED for each signal line in the
cable, and the LED lights green or red dependent on the signal state. The
Breakout box also allows you to disconnect certain lines in the cable, and
patch in new ones - good for trying new cable wiring possibilities.
The first thing to remember, is that there is a good chance the two
devices you are trying together will actually work if you can get the
cable correct. If you have some other way to actually prove this - for
instance by trying each of the devices on another system - do it.
Given a hypothetical example - for instance connecting a standard PC
with a DB25M to a 200 disk CD changer with a DB25M, the first thing I
would try and do is get a cable that I think would work. In this instance,
I would either purchase or build a null-modem cable (DB25F to DB25F) -
similar to the last example, basically the cable used to connect two PCs
together with handshaking, only DB25F to DB25F instead of DB9F to DB9F.
Given the cable that I believe will work, connect the cable, LED box
and two devices all together. Before powering on both devices, unplug just
one of them. Power the devices on and make a note of which LEDs are lit.
Then unplug the connected device and plug in the disconnected one, without
rearranging the cabling otherwise. Again make a note of which LEDs are
lit. If any single LED is lit by both of the devices, then there is an
output conflict, and the cable wiring is incorrect. By this, I mean that
one line in the cable has an output driving it from both ends - and this
is not correct for RS232 - so that means that the cable wiring is not
correct for the devices. Pay particular attention to Tx and Rx.
To continue with the example above, if I saw that two ends were driving
the same lines, I would assume the null modem cable was not correct, and I
would try a one-for-one gender changer instead.
If each end drives its own set of LEDs, connect the two ends together.
In normal situations, you should see all the LEDs light up - but there are
some devices which will not light up all the LEDs. Having said that, if
one of the devices is a PC and any LED except RI (Ring indicator) is not
lit up, the cable will probably not work.
Normally, other cabling problems will involve handshake lines. An LED
box will be an invaluable guide, but there is no trivial test to determine
the solution. An LED Box will also show the lines as they change state,
although it is usually quite hard to see the serial communications
themselves unless the comms are continuous, or at a low baud rate (9600
baud or lower is usually visible).
Using a 'T' plug and a PC to monitor comms
The gadget below is a quick 10 minute project that is really great for
monitoring RS232 Comms using a PC.
A gadget for monitoring RS232 Comms between two
devices
There are three sockets on our monitoring gadget. Two of them are
connected straight through - you plug them in series with the devices you
wish to monitor - and the third goes off to another monitoring PC.
The monitoring PC "Sees" on its serial port both sides of the serial
conversation - that is it sees what is sent by PC1 and also what is sent
by PC2. This can be a positive advantage, because you can see the serial
conversation as it progresses between the two devices. Some serial
protocols, however, talk "full duplex" meaning that one end can start
transmitting while it is still receiving from the other end. This unit
cannot monitor full duplex Comms - you will see gobble-dee-gook where the
two transmissions overlap.
If you try this unit, you will be surprised how useful it is, and how
often it works - mostly because many supposedly full duplex installations
still talk half duplex in any case, because that is the sensible way to
write the software. Not bad for one diode and a resistor, huh?
Serial and Parallel cable
schematics and wiring diagrams.
Referenced from Jaspayne.com
Use the I/O
ActiveX control for serial and parallel communication. ASCII Code Table
9 PIN to 9 PIN Serial
Cable
25 PIN to 9 PIN Serial
Cable
Parallel Printer Connector
Db-25
DB-25 PIN (Female)
SIGNAL
DB-25 MALE CONN DB-25 FEMALE
CONN
1 -------------------------------
> STROBE *
2 -------------------------------
> DATA 0
3 -------------------------------
> DATA 1
4 -------------------------------
> DATA 2
5 -------------------------------
> DATA 3
6 -------------------------------
> DATA 4
7 -------------------------------
> DATA 5
8 -------------------------------
> DATA 6
9 -------------------------------
> DATA 7
10<
------------------------------ ACK *
11<
------------------------------ BUSY
12<
------------------------------ PAPER END
13 ------------------------------
SLCT (select)
14 ------------------------------
>AUTOFEED *
15<
------------------------------ ERROR *
16
--------------------------->INITIALIZE PRINTER *
17 -------------------------------
SLCTIN (select in)
18 thru 25 -----------------------
GND
Note!! * denotes an active low
signal.
Db-25
Parallel Loopback Connector Wiring
1 to 13 Strobe to
select
10 to 16 ACK to INIT
11 to 17 BUSY to
SLCTIN
12 to 20 PAPER END to
GND
Rs-232 Serial (Com) Pc Port
Connector Db-9
DB-9 PIN (Male) FUNCTION
ABBREVIATION
1 --------------------------- Data
Carrier Detect CD or DCD
2 ------------------------------
Receive Data RD or RX
3 ----------------------------
Transmitted Data TX or TD
4 ---------------------------- Data
Terminal Ready DTR
5 ------------------------------
Signal Ground GND
6 ------------------------------
Data Set Ready DSR
7 ------------------------------
Request To Send RTS
8 ------------------------------
Clear To Send CTS
9 ------------------------------
Ring Indicator RI
Transmitted and receive data are
referenced from the data device and
not the modem.
Rs-232 Serial (Com) Pc Port
Connector Db-25
DB-25 PIN (Male) FUNCTION
ABBREVIATION
1 ----------------------------
Chassis/Frame Ground GND
2 ------------------------------
Transmitted Data TX or TD
3 --------------------------------
Receive Data RX or RD
4 ------------------------------
Request To Send RTS
5 -------------------------------
Clear To Send CTS
6 -------------------------------
Data Set Ready DSR
7 -------------------------------
Signal Ground GND
8 ---------------------------- Data
Carrier Detect DCD or CD
9 -------------------------
Transmit + (Current loop) TD+
11 ------------------------
Transmit - (Current Loop) TD-
18 -------------------------
Receive + (Current Loop) RD+
20 --------------------------- Data
Terminal Ready DTR
22 -----------------------------
Ring Indicator RI
25 -------------------------
Receive - (Current Loop) RD-
NOTE!! Current loop technology was
supported in the PC and XT interfaces.
Current loop was discontinued when
the AT interface was introduced.
Transmitted and receive data are
referenced from the data
device and not the
modem.
Db-25 Female Serial Loopback
Plug Wiring
2 to 3 Xmit to Rec
data
4 to 5 to 22 RTS to CTS to
RI
6 to 8 to 20 DSR to CD to
DTR
Db-9 Female Serial Loopback Plug Wiring
2 to 3 Xmit to Rec
data
7 to 8 to 9 RTS to CTS to
RI
6 to 1 to 4 DSR to CD to DTR
Rs-232 Serial Db-9 To Rs-232
Db-25 Adaptor
DB-9 PIN (Female) DB-25 PIN
(Male)
1
------------------------------------- 8 DCD
2
------------------------------------- 3 TXD
3
------------------------------------- 2 RXD
4
------------------------------------- 20 DTR
5
------------------------------------- 7 GND
6
------------------------------------- 6 DSR
7
------------------------------------- 4 RTS
8
------------------------------------- 5 CTS
9
------------------------------------- 22 RI
Use this pin out to adapt between
the two serial connector
types.
Rs-232 Serial Db-25 To Db-25
Null Modem Cable
DB-25 PIN (Female) PC DB-25 PIN
(Female) PC
2
------------------------------------- 3
3
------------------------------------- 2
7
------------------------------------- 7
4
------------------------------------- 5
5
------------------------------------- 4
6
------------------------------------- 20
20
------------------------------------ 6
Note!! All other pins are unused.
Use this cable pinout for direct
connection between two IBM
compatible computers.
Rs-232 Serial Db-25 To Serial
Printer Null Modem Cable
DB-9 Female PC DB-25 PIN Female PC
DB-25 PIN Male printer
2 < RD --------- 3
<------------------------------------- 2 Transmitted data
3 > TD --------->2
-------------------------------------> 3 Receive data
5 < GND -------- 7
<------------------------------------> 7 Ground
8 < CTS -------- 5
------------------------------------ 6 to 8 to 20
1 to 4 to 6 6 to 8 to 20 4 to
5
DTR/DSR/DCD DTR/DSR/DCD RTS to
CTS
Note!! Use this cable pinout for
direct connection between a PC
serial port and a serial printer.
The 1/4/6 and 6/8/20 loopbacks are to enable the
interface as if a modem was attached.
Standard Centronics Parallel
Cable Db-25 To Centronics 36
DB-25 PIN Male (PC) Centronics 36
Male
CENTRONICS 36 MALE CENTRONICS 36
FEMALE
1
--------------------------------------> 1 Strobe *
2
<-------------------------------------> 2 Data bit 0 +
3
<-------------------------------------> 3 Data bit 1 +
4
<-------------------------------------> 4 Data bit 2 +
5
<-------------------------------------> 6 Data bit 3 +
6
<-------------------------------------> 6 Data bit 4+
7
<-------------------------------------> 7 Data bit 5 +
8
<-------------------------------------> 8 Data bit 6 +
9
<-------------------------------------> 9 Data bit 7 +
10
<------------------------------------- 10 Acknowledge *
11
<------------------------------------- 11 Busy +
12
<------------------------------------- 12 Paper out +
13
<------------------------------------- 13 Select (in) *
14
-------------------------------------> 14 Auto Feed *
15
<------------------------------------- 32 Error *
16
-------------------------------------> 31 Initialize printer *
17
-------------------------------------> 36 Select (out) *
18 thru 25 Gnd 16, 19 thru 30, 33
Ground
15, 17, 18, 34, 35 No
connection
Note!! * denotes and active low
signal. This pin out depicts the newer bi-directional parallel
port with input and output
capabilities often used with external tape drives and
accessory devices. If pins 31 or 32
are grounded on a cable the printer will fail to
come ready when attached to the PC.
This is common on low cost parallel printer cables.
S-VIDEO (SVHS)
WIRING
Referenced from
http://www.leadsdirect.f9.co.uk/svideoleads.htm
S-Video is a technical specification for the
transfer of video information via a 4 pin mini din
cable. These leads are sometimes also referred to
as 'S-VHS' leads, which is technically incorrect.
However, the two names can be used interchangeably to
refer to the same type of cable. These leads are
commonly used for connecting video sources such as video
cameras, PC Video Grabber cards, DVD players etc., to
other devices and of course to televisions.
Contrary to popular belief this type of lead
carries video signals ONLY, and no audio whatsoever. The
connections for s-video wiring are as displayed
below:
VIEW OF THE
SOLDERED SIDE
FRONT
VIEW
Paul J Reitschky
Pr101j
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