![Because PCs first used DB25 connectors for their serial and parallel ports, when the PC serial port began to use 9-pin connectors, they were often called "DB9" instead of DE9, due to Because PCs first used DB25 connectors for their serial and parallel ports, when the PC serial port began to use 9-pin connectors, they were often called "DB9" instead of DE9, due to](https://external-preview.redd.it/ZbI7IxAeJaNRfuH-OXdNYrkr4MUukwPHdJzv1EKShvg.jpg?auto=webp&s=ecb9b67c45efc7f3d40d8ab702ac0c4199fbdca4)
Because PCs first used DB25 connectors for their serial and parallel ports, when the PC serial port began to use 9-pin connectors, they were often called "DB9" instead of DE9, due to
![USB to DB9 D-Sub Male Com Port FTDI RS232 Serial Converter Adapter Communication Upgrade Cable (Standard DB9 Pinout: - Walmart.com USB to DB9 D-Sub Male Com Port FTDI RS232 Serial Converter Adapter Communication Upgrade Cable (Standard DB9 Pinout: - Walmart.com](https://i5.walmartimages.com/asr/84826c90-cb68-45d9-8124-3bb407af52b1.060236c7f447c114ef4beeeb6dfc6acd.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
USB to DB9 D-Sub Male Com Port FTDI RS232 Serial Converter Adapter Communication Upgrade Cable (Standard DB9 Pinout: - Walmart.com
![How to make your own serial cable to connect PC to CTS-PHD1080P4XS1 a.k.a. Sangam camera - Cisco Community How to make your own serial cable to connect PC to CTS-PHD1080P4XS1 a.k.a. Sangam camera - Cisco Community](https://community.cisco.com/legacyfs/online/legacy/3/7/4/107473-DB9_DTE.png)
How to make your own serial cable to connect PC to CTS-PHD1080P4XS1 a.k.a. Sangam camera - Cisco Community
![Amazon.com: PNGKNYOCN 4.5 Feet DB9 (9 Pin) Female to DB25 (25 Pin) Male Empty Modem Serial Parallel Printer Cable YOUCHENG for DTE PC Mac Linux Data Transmission Communication : Electronics Amazon.com: PNGKNYOCN 4.5 Feet DB9 (9 Pin) Female to DB25 (25 Pin) Male Empty Modem Serial Parallel Printer Cable YOUCHENG for DTE PC Mac Linux Data Transmission Communication : Electronics](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/614vlhm7bdL.jpg)