This section contains information on the following topics:
- P_SND_RK: Fetching or sending data (S7-300, S7-400)
- P_RCV_RK: Receive data or Provide data (S7-300, S7-400)
- P_PRT341: Print message text with up to 4 variables (S7-300, S7-400)
- V24_STAT_340 / V24_STAT: Reading accompanying signals from the RS232C interface (S7-300, S7-400)
- V24_SET_340 / V24_SET: Writing accompanying signals to the RS232C interface (S7-300, S7-400)
- STATUS parameter (S7-300, S7-400)