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30 Process Image WAGO-I/O-SYSTEM 750750-652 Serial Interface RS-232 / RS-485Manual1.2.0Table 18: Status byte S1Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0EOV EFR EPR CTS BUF_E IL5 IL4 IL3IL3 Input length (number of characters received that are available in the input data,bit 3)IL4 Input length (number of characters received that are available in the input data,bit 4)IL5 Input length (number of characters received that are available in the input data,bit 5)BUF_E Buffer empty (message: transmit inactive)CTS This value is always 01).EPR Error parity (message: error during the parity check)EFR Error framing (message: data frame is defective)EOV Error overrun (message: a character was lost during receipt)1) Only applies to flow control "RTS with lead/follow-on time":Status of the CTS input:Bit 4 is 0: CTS activeBit 4 is 1: CTS inactiveFor evaluation of the bits of the status byte that signal errors, see chapter"Diagnostics".4.2 Data Exchange ModeThe data to be sent and received will be stored in up to 47 input and output bytes(D0 ... D46). Data flow is controlled with control and status bytes C0 and S0.Table 19: Process data in data exchange modeProcessimagelengthInput data Output data8 bytes S0 Status byte 0 C0 Control byte 0D0 Data byte 0 D0 Data byte 0D1 Data byte 1 D1 Data byte 1D2 Data byte 2 D2 Data byte 2… …D6 Data byte 6 D6 Data byte 624 bytes D7 Data byte 7 D7 Data byte 7… …D22 Data byte 22 D22 Data byte 2248 bytes D23 Data byte 23 D23 Data byte 23… …D46 Data byte 46 D46 Data byte 46The structure of the control and status bytes is described in the tables below. |
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