WAGO Modular IO System INTERBUS S, User Manual

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RS232,TTY,RS485 750-650,651,653
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Examples:
The module is initialized.
- The initialization bit in the control byte is set.
Output byte 0 Control byte Output byte 2 Output byte 1
0x00 0000.0100 0x00 0x00
- After the initialization has been executed, the status byte will give back 000.0100.
Input byte 0 Status byte Input byte 2 Input byte 1
XX 0XXX.X0XX XX XX Module is still being reset
XX 0XXX.X1XX XX XX
Initialization completed
Sending of the data string “Hello”:
- The first 3 characters and the buffer length of 3 are transmitted.
Output byte 0 Control byte Output byte 2 Output byte 1
‘H’ (0 x 48) 0011.0000 ‘l’ (0 x 6C) ‘e’ (0 x 65)
- The transmission request bit (TR) is inverted.
Output byte 0 Control byte Output byte 2 Output byte 1
‘H’ 0011.0001 ‘l’ ‘e’
- As soon as TR=TA, the rest of the data can be sent.
Input byte 0 Status byte Input byte 2 Input byte 1
XX 0XXX.XXX
0 XX XX
The data is still being transferred.
XX 0XXX.XXX
1 XX XX Data transfer completed.
- The last 2 characters and the buffer length of 2 are transmitted.
Output byte 0 Control byte Output byte 2 Output byte 1
‘l’ 0010.0001 XX ‘o’ (0 x 6F)
- The transmission request bit (TR) is inverted.
Output byte 0 Control byte Output byte 2 Output byte 1
‘l’ 0010.0000 XX ‘o’