Be sure your RS-232 cable is compatible with Keysight instruments.

Operational "How to" GuidesSummaryNot all RS-232 cables have the same configuration, if you don´t have the correct cable to connect to Keysight instruments, you will need adapt it with 34398A/99A kit.Description Not all RS-232 cables are the same, and sometimes, we have connectivity problems when we want to connect Keysight instruments to a PC through this interface. When we have connectivity problems between the PC and the instrument, we must first check whether the configuration is correct on both the PC and the computer, (baud, etc), if that confirms correct, then we must suspect the cable, your pins configuration may not be compatible with Keysight instruments, and we will need an adapter or change the cable. The 34398A is a RS-232 cable with 9 pins (f) to 9 pins (f). Standard RS-232 cables are easy to find, otherwise they work properly. The 34398A has been verified to be compatible with all Keysight instruments, and also includes a 9 pin (m) to 25 pin (f) adapter. Click in the link to see different alternatives of RS-232 connections and options