9 Pin to 25 Pin Serial. It appears that you are using AdBlocking software. The cost of running this website is covered by advertisements. If you like it please feel free to a small amount of money to secure the future of this website. Pinouts cables serial. 9 Pin to 25 Pin Serial. It appears that you are using AdBlocking software. The cost of running this website is covered by advertisements. 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. The console port is an RS-232 serial interface that uses an RJ-45 connector to connect to a management device such as a PC or a laptop. If your laptop or PC does not have a DB-9 male connector pin and you want to connect your laptop or PC to the device, use a combination of the RJ-45 to DB-9 female adapter along with a USB to DB-9 male adapter. D-sub 9 Connector Pinout. Pinout and diagram of DE9 connector (DB9 connector), commonly used for serial ports (RS-232).
Fig.1 RS232/V.24 DB9
Pin | Name | Description |
---|---|---|
1 | CD | Carrier Detect |
2 | RXD | Receive Data |
3 | TXD | Transmit Data |
4 | DTR | Data Terminal Ready |
5 | GND | System Ground |
6 | DSR | Data Set Ready |
7 | RTS | Request to Send |
8 | CTS | Clear to Send |
9 | RI | Ring Indicator |
X.21 interface on a DB 15 connector
Fig. 2. X.12 DB15 connector
RJ-45 RS232 connector
EIA-561 defined RS232 on RJ 45 (modular) connector. It can be used only for nonsynchronous applications onlym because it does not have synchronous clocking signals. Note: The RI pin (#1) sometimes can be used as DSR.
Fig.3. RJ-45 RS232 connector
RJ45 RS232D connectors (same as telephone connectors)
Pin No. | Signal Description | Abbr. | DTE | DCE |
---|---|---|---|---|
1 | DCE Ready, Ring Indicator | DSR/RI | «-- | --» |
2 | Received Line Signal Detector | DCD | «-- | --» |
3 | DTE Ready | DTR | --» | «-- |
4 | Signal Ground | SG | ||
5 | Received Data | RxD | «-- | --» |
6 | Transmitted Data | TxD | --» | «-- |
7 | Clear To Send | CTS | «-- | --» |
8 | Request To Send | RTS | --» | «-- |
DB25 V.24 pinout and signals
Fig.4. RS232 V.24 connector
9 Pin Serial Null Modem Cable Pinout
DB25 V.24 pinout and signals (ALT A connector)
Fig.5. RS232 V.24 (ALT A) connector
RS232 DB25 all pins (some applications require more pins)
Fig.6. RS232 DB25 connector
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