RS 232 Pinout, DB9 Pinout, RS 485 Pinout Diagram Explained


RS 232 is a standard for serial communication of transmission data. The signals connecting between Data Terminal Equipment(DTE) and Data Communication Equipment(DCE) can be defined as the RS 232. An example of Data Terminal equipment is a computer. On the other hand, an example of data communication equipment is a modem. The RS 232 defines the electrical characteristics of the signal, the timing of signals, and the physical size and pinout of the connector. RS 485 is also a standard for serial communication. These RS 232 and RS 485 connectors are referred to as DB9 connectors because they have 9 pins or data lines. The RS-485 is also known as TIA-485(-A) or EIA-485. RS 232 is mostly used in local computer appliances whereas the RS 485 is used in industrial control circuits and systems.


RS 232 Pinout Diagram(DB9)


Here, you can see the pinout diagram of RS 232(DB9 Connector)

RS 232 Pin Out Diagram(DB9), RS 232 Connector


Here, you can see a total of nine(9) lines or ports. From the upper left side, it is to be counted from number 1. It is a DB9 Male connector. For a female connector, the upper right side to left is to be counted from number 1. Here are the pin details,

Pin No. 1 - Data Carrier Detect(DCD) - In

Pin No. 2 - Received Data(RXD) - In

Pin No. 3 - Transmit Data(TXD) - Out

Pin No. 4 - Data Terminal Ready(DTR) - Out

Pin No. 5 - Ground(GND)

Pin No. 6 - Data Set Ready(DSR) - In

Pin No. 7 - Request to Send(RTS) - Out

Pin No. 8 - Clear to Send(CTS) - In

Pin No. 9 - Ring Indicator(RI)


RS 485 Pinout Diagram(DB9 Male Connector)


Here, you can see the pinout diagram of RS 485(DB9 Male Connector)

RS 485 Pin Out Diagram(DB9 Male Connector), RS 485 Connector


RS 485 can be used with local networks and it can be used up to 10 Mbit/s. Generally, the RS 485 drivers use three-state logic that allows deactivating the transmitters individually. In most of the cases, the RS 485 only specifies the electrical characteristics or it works with only the physical layer but it does not specify any communication protocol. The RS 485 is also widely used in the automation system for data saving, data storing, controlling, etc.

Here are the pin details,

Pin No. 1 - Common Ground(GND)

Pin No. 2 - Clear to Send(CTS) +

Pin No. 3 - Ready to Send(RTS) +

Pin No. 4 - Received Data(RXD) +

Pin No. 5 - Received Data(RXD) -

Pin No. 6 - Clear to Send(CTS) -

Pin No. 7 - Ready to Send(RTS) -

Pin No. 8 - Transmitted Data(TXD) +

Pin No. 9 - Transmitted Data(TXD) -


RS 485 Pinout Diagram(DB9 Female Connector)


Here, you can see the Pinout Diagram of RS 485 Pinout Diagram(DB9 Female Connector)

RS 485 Pin Out Diagram(DB9 Female Connector), RS 485 Connector


For the male connector, the pins should be counted from the upper left port, but in the case of the female connector, the ports should be counted from the upper right port.
Here are the Pin Details,

Pin No. 1 - Common Ground(GND)

Pin No. 2 - Clear to Send(CTS) +

Pin No. 3 - Ready to Send(RTS) +

Pin No. 4 - Received Data(RXD) +

Pin No. 5 - Received Data(RXD) -

Pin No. 6 - Clear to Send(CTS) -

Pin No. 7 - Ready to Send(RTS) -

Pin No. 8 - Transmitted Data(TXD) +

Pin No. 9 - Transmitted Data(TXD) -


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RS 232 Pinout, DB9 Pinout, RS 485 Pinout Diagram Explained RS 232 Pinout, DB9 Pinout, RS 485 Pinout Diagram Explained Reviewed by Author on 2/09/2022 Rating: 5
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