DB9-F pinout - L3, Q, Q | plus, BPR, BPR | zero

RBR standard instruments can use patch cables  for connecting to your computer and power supplies. Select RS-232 or RS-485 cable at the time of purchase. Your instrument would require different internal wiring for these two types. Depending on the ordered configuration, your patch cable may have an embedded converter and either a USB connector or a DB9-F connector. 

Refer to RBR Cable Guide 0004897revG.pdf for available options.