10 Foot DB9 Female to DB25 Male Serial RS232 Modem Cable
Amazon.com: StarTech.com USB to Serial RS232 Adapter - DB9 Serial DCE Adapter Cable with FTDI – Null Modem - USB 1.1 / 2.0 – Bus-Powered (ICUSB232FTN) : Electronics
3ft (0.9m) Serial RS232 DB9 Null Modem Cable with Low Profile Connectors M/F - In-Wall CMG-Rated | Serial RS232 | Computer Cables | USB and PC
Industrial Wireless Rs232 Serial Gsm Gprs Modem With Sim Slot - Modems & Gateways - AliExpress