52
Commissioning
WAGO-I/O-SYSTEM 750
750-652 Serial Interface RS-232 / RS-485
Manual
Version 1.4.0
•
Blocking of the transmit and receive functions
•
Deletion of the transmit and receive memory
•
Loading of the configuration data in the serial I/O module
Transmit data:
•
TR = TA: Writing of the characters to be transmitted in output bytes D0 to
Dn
•
Number of characters to be transmitted is specified in OL0 to OL5
•
Inversion and output of TR
•
Transfer to the output buffer takes place when TR = TA
Receive data:
•
RR ≠ RA: in input byte 0 to n characters are available
•
Number of characters received is specified in IL0 to IL5
•
Reading out of the characters in IL0 to IL5
•
Inversion and output of RA
•
Reading out has taken place when RR = RA
The transmission and receipt of data between controller and I/O module can take
place simultaneously. The initialization request is executed with priority and
immediately ends the transmission and receipt of data.
Reset initialization bit!
The initialization bit in control byte C0 must be reset. As long as the initialization
bit is set, no data is exchanged. The initialization bit can be reset simultaneously
with transmission of the initial data.
Always read received data!
The input buffer of the I/O module is 80% full if the BUF_F bit is set in status
byte 0. If the input buffer if full, the I/O module cannot receive any further data
via the serial interface. Any data transmitted by an external device is lost.
8.3.2
Initialization
The I/O module is initialized.
The initialization bit is set in the control byte 0.
Table 28: Initialization Bit
Control byte 0
Control byte 1
Output byte 0
Output byte 1
'0000.0100'
'0000.0000'
XX
XX
The execution of the initialization is acknowledged by the I/O module with the
setting of the bit IA.
