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Cabos Seriais PC / Mac

A finalidade dos cabos seriais é interligar um dispositivo DTE RS 232 com um DCE 

A configuração mínima para o modem operar é :

 Data, Signal Ground and Data Terminal Ready 

As fontes dos sinais são, respectivamente :

This a DTE port as on the back of a PC Com Port
EIA-574 RS-232/V.24 pin out on a DB-9 pin
used for Asynchronous Data

RS 232 serial port (9-pin) DTE-device (PC) male connector, female cable connector
PIN	DESCRIPTION
1	Data Carrier Detect
2	Received Data
3	Transmitted Data
4	DTE (Data Terminal) Ready
5	Signal Ground
6	DCE (Data Set) Ready
7	Request to Send
8	Clear to Send
9	Ring Indicator

RS232 is a voltage loop interface for two-way (full-duplex) communication represented by voltage levels with respect to system ground (common). A common ground between the PC and the associated device is necessary. Maximum serial cable length is defined: 75 feet at 9,600 bps, but today cables up to 1,000 feet are used sucessfully.

The interface is single ended (connecting only two devices with each other), the data rate is less than 20 kbps.

Data:
- logical "1" (Mark) is represented by a negative voltage of -3V to -25V
- logical "0" (Space) is represented by a positive voltage of +3V to +25V

Devices that communicate over a serial interface are divided into two classes: DTE and DCE. The most important difference between these types of devices is that the DCE device supplies the clock signal that paces the communications on the bus. All DTE-DCE cables are straight through, the pins are connected one to one. DTE-DTE and DCE-DCE cables are cross cables.

DTE - DCE is called a 'Straight Cable'
DTE - DTE is called a 'Null-Modem Cable'
DCE - DCE is called a 'Tail Circuit Cable'

DTE (Data Terminal Equipment) devices are: computers, terminals, printers, CSU/DSU, Multiplexers. DCE (Data Communications Equipment) devices are: modems and other equipment.
Hubs and Routers could be either DTE or DCE.

This difference determines, which signal a device expects on which pin. Any device is configured as either a DTE or a DCE device. Cables between DTE and DCE are different from cables between DCE and DCE devices. The connector is a 25-pin D-Sub connector (for possible synchronous communications), or a 9-pin D-Sub connector (the subset for asynchronous communications). With asynchronous communications the serial data bits are not locked to a specific clock at the receiving end. The bits are synchronized by the transmit clock at the sending end.

RS232 Data Structure:

25 pin Serial Port RS232 male connector, female cable connector
PIN	DESCRIPTION	Ground
1	SHIELD	Ground
2	TXD	Transmit Data
3	RXD	Receive Data
4	RTS	Request to Send
5	CTS	Clear to Send
6	DSR	Data Set Ready
7	GND	System Ground
8	CD	Carrier Detect
9	n/c	(reserved for testing)
10	n/c	(reserved for testing)
11	n/c
12	n/c	(secondary receive line)
13	n/c	(secondary clear to send)
14	n/c	(secondary tranmitted data)
15	n/c	(transmitter signal element timing)
16	n/c	(secondary received data)
17	n/c	(receiver signal element timing)
18	n/c	(local loopback)
19	n/c	(secondary request to send)
20	DTR	Data Terminal Ready
21	n/c	(remote loopback / signal quality detector)
22	RI	Ring Indicator
23	n/c	(data signal rate select)
24	n/c	(transmit signal element timing)
25	n/c	(test mode)

Null-Modem Cable, two female 9-pin D-Sub Connectors, DTE-DTE Connection

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Null-Modem Cable without Handshaking, two female Connectors, DTE-DTE Connection(for DTE to DCE connection a straight cable will be used)

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Null-Modem Cable with Loopback-Handshaking, two female Connectors, DTE-DTE Connection

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Null-Modem Cable with Full Handshaking, two female Connectors, DTE-DTE Connection

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RS232 over RJ45 (RS232D)
Description	RJ45 Pin
Signal Ground	4
Transmitted Data	6
Received Data	5
Request To Send	8
Clear To Send	7
DCE Ready, Ring Indicator	1
DTE Ready	3
Received Line Signal Detector	2

RS232 - DB25 (not the full 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

Pins used for Synchronous data

RS232 - V.24/V.28 - IS2110 - X.20 bis (for Async) - X.21 bis (for Sync)

General

In this document the term RS232 will be used when refered to this serial interface. The description of RS232 is an EIA/TIA norm and is identical to CCITT V.24/V.28, X.20bis/X.21bis and ISO IS2110. The only difference is that CCITT has split the interface into its electrical description (V.28) and a mechanical part (V.24) or Asynchronous (X.20 bis) and Synchronous (X.21 bis) where the EIA/TIA describes everything under RS232.

As said before RS232 is a serial interface. It can be found in many different applications where the most common ones are modems and Personal Computers. All pinning specifications are writen for the DTE side.

All DTE-DCE cables are straight through meaning the pins are connected one on one. 

DTE-DTE and DCE-DCE cables are cross cables. To make a destiction between all different types of cables we have to use a naming convention.

DTE - DCE: Straight Cable
DTE - DTE: Null-Modem Cable
DCE - DCE: Tail Circuit Cable Interface Mechanical

RS232 can be found on different connectors. There are special specifications for this. The CCITT only defines a Sub-D 25 pins version where the EIA/TIA has two versions RS232C and RS232D which are resp. on a Sub-D25 and a RJ45. 

Next to this IBM has added a Sub-D 9 version which is found an almost all Personal Computers and is described in TIA 457.

Pinning

Interface Electrical

All signals are measured in reference to a common ground, which is called the signal ground (AB). A positive voltage between 3 and 15 Vdc represents a logical 0 and a negative voltage between 3 and 15 Vdc represents a logical 1.
This switching between positive and negative is called bipolar. The zero state is not defined in RS232 and is considered a fault condition (this happens when a device is turned off).
According to the above a maximum distance of 50 ft or 15 m. can be reached at a maximum speed of 20k bps. This is according to the official specifications, the distance can be exceeded with the use of Line Drivers.Functional description.

The secondary signals are used on some DCE's. Those units have the possibility to transmit and/or receive on a secondary channel. Those secondary channels are mostly of a lower speed than the normal ones and are mainly used for administrative functions.

Cable pinnings
Here are some cable pinnings that might be useful. Not all applications are covered, it is just a help:

Cables & Communication Information for Developers

http://www.fentonups.com/Support___Service/Cables___Comm_Info/cables___comm_info.html 

Fenton UPS products (except PowerOffice) come with a DB9 female interface port and a custom DB9 male-female cable. Please note: a standard serial cable will not work with Fenton UPS products.

The interface port supports both RS232 and contact closure signals. The contact closure signals are relay signals and are "normal open". The RS232 signals are photo-transistor signals. The pin assignments on the DB9 female interface port on the UPS are as follows:

1 - N/A
2 - AC Failure (Contact Closure)
3 - N/A
4 - Common
5 - Battery Low (Contact Closure)
6 - Rx (RS232) and Turn Off UPS (Contact Closure)
7 - Common
8 - N/A
9 - Tx (RS232)

The pin assignments of the Fenton DB9 male-female cable are as follows:

DB9 female (to computer) DB9 male (to UPS)
2----------------------------------9
3----------------------------------6
4 and 8 shorted-------------------1
5----------------------------------7

In order to interface with a DB25 male serial port on a computer, either a standard serial DB9/25 adapter can be used with the regular Fenton cable, or a custom cable can be made. The pin assignments for a custom DB25 female - DB9 male cable would be as follows:

DB25 female (to computer) DB9 male (to UPS)
2---------------------------------6
3---------------------------------9
5 and 20 shorted------------------1
4, 6, and 8 shorted----------------NC
7---------------------------------7

"Contact closure" cables for applications such as Windows NT and 2000 built-in UPS feature or custom programs can be purchased from Fenton Technologies. Click here for a schematic of the design of this contact closure cable.

Click here for a schematic of how to implement a contact closure solution.

Click here for a schematic of a cable for use with Macintosh (DB9 male to MD8 male cable).

For information about the Fenton UPS communications protocol, please call us. 

Pinagem conector mini DIN 6 pinos 

Speed Stream 5660 / 5662

Essa é a numeração com o conector voltado de frente para você, 

ou seja, com a extremidade do encaixe e não da solda voltada p/ você.