Best Null Modems

StarTech.com 6ft (1.8m) 1-Port USB to Serial RS232 Adapter, FTDI DB9 Serial DCE Adapter Cable, Null Modem, USB 2.0 - TAA

PC Arena DB9 Female DB9 F 9 pin RS232 Serial Null Modem Cable 5m

DTech DB9 RS232 Serial Null Modem Cable Female to Female Full Handshaking 7 Wire Crossover for Data Communication 0.5M

DIGITUS D-Sub 9 Null-Modem Adapter - 9-Pin female - male to female - gender changer - metal housing

DTech 5M DB9 RS232 Serial Cable Male to Female Null Modem Cord Full Handshaking 7 Wire Crossover for Data Communication

StarTech.com 1 m Black DB9 RS232 Serial Null Modem Cable F/M, DB9 Male to Female, 9 Pin Null Modem Cable, 1x DB9 (M), 1x DB9 (F) - Black

PNGKNYOCN DB9 to DB25 Conversion cable RS232 female to DB25 male null modem serial parallel printer cable for DTE PC Mac Linux data transmission communication（1.5M）

StarTech.com 2m Black DB9 RS232 Serial Null Modem Cable F/F - DB9 Female to Female - 9 pin RS232 Null Modem Cable - 2 meter, Black (SCNM9FF2MBK)

rhinocables 9 Pin Serial RS232 Male to Male Coupler Adapter Gender Changer Join 9pin Cables D-Sub 9 DB9

DB9 null modem adapter male to male slimline data transfer serial port adapter 2 Pack