Hit N Mix Com Serial Cable Pin
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Hit N Mix Com Serial Cable Pin 3,8/5 4444 votes
RS232 serial connector pin assignment. The RS232 connector was originally developed to use 25 pins. In this DB25 connector pinout provisions were made for a secondary serial RS232 communication channel. In practice, only one serial communication channel with accompanying handshaking is present. A serial cable transfers information between two devices using what’s known as a serial communication protocol. The type of connector you need is based on the serial port you use. A serial port differs from a parallel port, as it transfers information in and out one bit at a time. The most common interfaces are Ethernet and USB. Serial Cables.
RS232 Includes:
RS232 basicsRS232 standardSoftware handshakingSignals & voltage levelsPinouts & connectorsLoopback connectionsRS232 cables
Serial Data standards:Serial data standardsRS422RS449RS48520 mA current loop
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The correct connection of the various pins used for an RS232 data link are key to the operation of the system.
Knowing the RS232 pinouts, or pin connections, and being able to make the required links enables the handshaking to operate correctly and the data to flow smoothly.
Although the RS232 standard does not define a connector, the 9 way and 25 way D-type connectors are very popular and provide an excellent format.
When using RS232, two main types of equipment are nominated. One is a data Terminal Equipment, DCE and the other is known as the Data Terminal Equipment, DTE. These abbreviations are widely used within RS232 and other communications terminology.
By using the pin outs as detailed below the RS232 cables used should be a 'one to one' configuration. This considerably simplifies the manufacture of RS232 cables and often means that standard cables can be used.
RS232 25 pin connections and functions
The RS232 (EIA-232-A) specification provides a full set of details for a wide variety of connections that can be used with RS232. While many of them are not normally known, they may be used in some circumstances and therefore the details are provided here for reference.
| RS232 25 pin signal definition for the DTE device - looking into the DTE connector DTE device is often a PC | |||
|---|---|---|---|
| DTE Pin No | Circuit name | Abbreviation | Source |
| 1 | Protective earth | ||
| 2 | Transmitted data | TXD | DTE |
| 3 | Received data | RXD | DCE |
| 4 | Request to send | RTS | DTE |
| 5 | Clear to send | CTS | DCE |
| 6 | Data set ready | DSR | DCE |
| 7 | Signal ground | ||
| 8 | Data carrier detect | DCD | DCE |
| 9 | Reserved for data set test | ||
| 10 | Reserved for data set test | ||
| 11 | Unassigned | ||
| 12 | Secondary received signal detector | DCE | |
| 13 | Secondary clear to send | DCE | |
| 14 | Secondary transmitted data | DTE | |
| 15 | Transmission signal element timing | DCE | |
| 16 | Secondary received data | DCE | |
| 17 | Receive signal element timing | DCE | |
| 18 | Unassigned | ||
| 19 | Secondary request to send | DTE | |
| 20 | Data terminal ready | DTR | DTE |
| 21 | Signal quality detector | DCE | |
| 22 | Ring indicator | DCE | |
| 23 | Data signal rate selector | DCE/DTR | |
| 24 | Transmit signal element timing | DTE | |
| 25 | Unassigned | ||
| RS232 25 pin signal definition for the DCE device - looking into the DCE connector DTE device is often a device such as a modem | |||
|---|---|---|---|
| DCE Pin No | Circuit name | Abbreviation | Source |
| 1 | Protective earth | ||
| 2 | Received data | RXD | DCE |
| 3 | Transmitted data | TXD | DTE |
| 4 | Clear to send | CTS | DCE |
| 5 | Request to send | RTS | DTE |
| 6 | Data set ready | DCE | |
| 7 | Signal ground | ||
| 8 | Data carrier detect | DCD | DCE |
| 9 | Reserved for data set test | ||
| 10 | Reserved for data set test | ||
| 11 | Unassigned | ||
| 12 | Secondary received signal detector | DCE | |
| 13 | Secondary request to send | DTE | |
| 14 | Secondary received data | DCE | |
| 15 | Transmission signal element timing | DCE | |
| 16 | Secondary transmitted data | DTE | |
| 17 | Receive signal element timing | DCE | |
| 18 | Unassigned | ||
| 19 | Secondary clear to send | DCE | |
| 20 | Data terminal ready | DTR | DTE |
| 21 | Signal quality detector | DCE | |
| 22 | Ring indicator | DCE | |
| 23 | Data signal rate selector | DCE/DTR | |
| 24 | Transmit signal element timing | DTE | |
| 25 | Unassigned | ||
By using these configurations it means that an RS232 cable connecting a DTE to a DCE will be wired in a one-to-one configuration, i.e. pin 1 to pin 1, etc.
RS232 9pin connections, functions and pin-outs
Although the RS232 25 pin configuration with a 25 way D-type connector is very widely used, in many applications the smaller 9 way D-type connector is used in many applications. It provides an obvious size and cost benefit. Also the RS232 9pin configuration is quite sufficient in most circumstances because many of the lines available for RS232 signalling are rarely used. This means that the 9 way connector is able to provide all the required connectivity for most applications.
| RS232 9pin signal definition for the DTE device - looking into the DTE connector DTE RS232 device is often a PC. | |||
|---|---|---|---|
| Pin No | Circuit name | Abbreviation | Source |
| 1 | Received line signal detect | ||
| 2 | Receive data | RXD | |
| 3 | Transmit data | TXD | |
| 4 | Data terminal ready | DTR | |
| 5 | Signal ground | ||
| 6 | Data set ready | DSR | DCE |
| 7 | Request to send | RTS | |
| 8 | Clear to send | CTS | |
| 9 | Ring indicator | ||
| RS232 9pin signal definition for the DCE device - looking into the DCE connector DCE device is often a modem | |||
|---|---|---|---|
| Pin No | Circuit name | Abbreviation | Source |
| 1 | Received line signal detect | ||
| 2 | Transmit data | TXD | |
| 3 | Receive data | RXD | |
| 4 | Data terminal ready | DTR | |
| 5 | Signal ground | ||
| 6 | Data set ready | DSR | DCE |
| 7 | Clear to send | CTS | |
| 8 | Request to send | RTS | |
| 9 | Ring indicator | ||
By using these configurations it means that an RS232 cable connecting two RS232 devices, i.e. a DTE to a DCE will be wired in a one-to-one configuration, i.e. pin 1 to pin 1, etc.
When using RS232 it is essential to ensure that the correct connections are being used. It can be very difficult to fault-find when the wrong connections are made as nothing happens. Checking the voltages are correct and that the correct pins have been connected normally resolves the issues.
Sometimes confusion can be caused by defining which is the DTE and which is the DCE. Once this has been correctly done, and the correct pins connected, the system should operate well.
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