Antaira's serial adapters can quickly functions such as converting from male to female connections as well as null modem adapters.
Mini Gender Changer DB9 F/F Null Modem
SMA-Male Left Handed To Right Handed Adapter
DB9 Female to 5-pin 3.5mm Terminal Block RS422/485 Adapter for MSC- series
DB9 Female to 5-pin 3.8mm Terminal Block RS422/485 Adapter for STE- & STW- series