PtP data link CP 441 This section contains information on the following topics:Communication instructions (S7-300, S7-400)V24_STAT_441: Reading accompanying signals from the RS232C interface (S7-300, S7-400)V24_SET_441: Writing accompanying signals to the RS232C interface (S7-300, S7-400)SYSTAT error message area (S7-300, S7-400)