User`s guide

sensitivity setting for the touch-hold feature.
4. The 34410A/11A/L4411A hardware does not provide an RS-232 serial
interface.
5. Compatibility is provided only for SCPI commands for the 34401A. No
compatibility is provided for alternate languages such as for the HP 3478A
or the Fluke 8840A/8842A instruments.
6. Although timing adjustments have been made for compatibility, if your
program depends on the exact hardware timing characteristics of the
34401A, you may encounter timing differences that affect program
execution or measurements.