The smaller connecter is clearly marked "RS232" and is the only marking.
Mouse Adapter PS/2 Female to 9 Pin SUB D Female Serial RS232 Adapter Cable
Hanprmeee DB9 RS232 Serial Cable, Female to Female Null Modem Cord Simple Cross TX RX line Crossover for Computer Switch Router Data Communication 1M (3M)
DTECH 6 ft RS232 Serial Cable Female to Female 9 Pin Straight Through (Black, 2 Meters)
DTECH 5 Feet RS232 Serial Cable Female to Female 9 Pin Straight Through (Black, 1.5 Metres)
OIKWAN DB9 RS232 Serial Cable Female to Female, 3.3 Feet 9 Pin Crossover Cable for Data Communications
sourcing map 3.3 ft DB9 RS232 Serial Cable Female to Female Null Modem Cord 2-3 Crossover Extension Cable for Data Communication, Black
