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56 Commissioning WAGO-I/O-SYSTEM 750750-652 Serial Interface RS-232 / RS-485Manual1.2.0Table 37: Transmission of a block of one to 512 bytesControl byte 0 Control byte 1'0110.1001' '0XXX. X101' Controller fills the output buffer with 46 bytes and set bit3 (SC) of the control byte 0 for the start of thetransmission.Status byte 0 Status byte 1'0XXX.X0X1' '0000. 1XXX' I/O module confirms the acceptance of the data.Control byte 0 Control byte 1'0110.1000' '0XXX. X101' Controller takes bit 0 (TR) of the control byte 0 back.Status byte 0 Status byte 1'0XXX.X0X0' '0XXX. 0XXX' I/O module begins with the data transmission via theserial interface.Status byte 0 Status byte 1'0XXX.X0X1' '0000. 1XXX' All data is transmitted via the serial interface.Control byte 0 Control byte 1'0XXX.0XX0' '0XXX. 1XXX' Controller takes bit 3 (TR) of the control byte 0 back.8.3.5.2 Transmission of a block of more than 512 bytesThe output buffer is filled up with data up to number 512 bytes.To transmit the buffer content, the bit 3 (SC) of the control byte 0 is set by thecontroller. The I/O module begins with the data transmission and the bit 3(BUF_E) of the status byte 1 is reset.During transmission, the output buffer continues to be filled up by the controller.Bit 3 (SC) of control byte 0 is set by the controller as long as data should betransmitted. The I/O module acknowledges data transmission by resetting bit 3(BUF_E) in status byte 1.Then bit 3 (SC) of control byte 0 is taken back by the controller. The end of thetransmission from the I/O module is detected this way.NOTEAt higher baud rates, it cannot be ensured that more than 512 bytes of data aretransmitted as a contiguous block! |
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