20 • 750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop]
Datatransfer
WAGO-I/O-SYSTEM
750
Busklemmen
As soon as TR=TA, the rest of the data can be sent.
Input byte 0
Statusbyte
Input byte 2
Input byte 1
XX
'0XXX.XXX0'
XX
XX
The data is still
being transferred.
XX '0XXX.XXX1' 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
"1" '0010.0001' XX "o"
(0x6F)
The transmission request bit (TR) is inverted.
Output byte 0
Control byte
Output byte 2
Output byte 1
"1" '0010.0000' XX
"o"
As soon as TA = TR, the data has been transferred to the output buffer.
Input byte 0
Statusbyte
Input byte 2
Input byte 1
XX
'0XXX. XXX1'
XX
XX
The data is still
being transferred.
XX
'0XXX. XXX0'
XX
XX
Data transfer
completed.
Receiving the character chain "WAGO”
As soon as RA
RR, the input bytes contain data.
Output byte 0
Control byte
Output byte 2
Output byte 1
XX '0XXX.000X' XX
XX
Input byte 0
Statusbyte
Input byte 2
Input byte 1
XX
'0XXX. 0X0X'
XX
XX
No received data
available..
"W"
'0011.0X1X'
"G"
"A"
The information is in
the input bytes.
