750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop] • 19
Datatransfer
WAGO-I/O-SYSTEM 750
Busklemmen
The transmitting and receiving of data can be done simultaneously. The
initialization request has priority and will stop transmitting and receiving of
data immediately.
Attention
Resetting the initialization bit can be performed with the following message.
Message: input buffer full (Bit 3)
Input buffer is full. Data which is being currently received is now lost.
2.1.1.9.1 Example
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
Statusbyte
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" (0x48)
'0011.0000'
"1" (0x6C)
"a" (0x60)
The transmission request bit (TR) is inverted.
Output byte 0
Control byte
Output byte 2
Output byte 1
"H" '0011.0001' "1"
"a"
