Amazon.com: SF Cable, 6 ft DB9 F/F Null Modem Cable RS232 : Electronics
DB9 (f-f)Null Modem Cable, 6ft
Null Modem Cable Serial RS232 9 Pin DB9 Male to Female Gender Changer Lead UK | eBay
Amazon.com: CableWholesale Null Modem Cable, DB9 Female to DB25 Male Serial Cable, UL Rated, 8 Conductor, Beige, DB9 Female to DB25 Male Serial Null Modem Cable, 6 Feet : Electronics