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
DTECH DB9 RS232 Serial Cable Female to Female Null Modem Cord Full Handshaking 7 Wire Crossover for Data Communication (15 Feet, Black)
DTECH DB9 RS232 Serial Cable Female to Female Null Modem Cord Cross TX RX line for Data Communication (5 Feet, Black)
DTECH DB9 RS232 Serial Cable Female to Female Null Modem Cord Cross TX/RX line for Data Communication (6 Feet, Black)
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)
