Eaton XC-CPU101 Series, Instruction Leaflet

Page: 82 / 96

RS232 interface in transparent
mode (COM 1/2/3)
12/14 MN05003004Z-EN
64
“SysComRead” function
Data received via the RS232 interface in transparent mode can be
read with this function.
Table 17: Parameters of the “SysComRead” function
Figure 92: SysComRead function
dwHandle Return value of the “SysComOpen” function
SysComClose Return value TRUE: Closing of the RS232 interface was successful
dwBufferAddress Address under which the read data is stored
dwBytesToRead Limitation of the max. number of data bytes
(COM 1: max. 190 bytes; COM 2 + 3: max. 250 bytes)
dwTimeout Parameter without meaning
SysComRead Return value: Informs you about the number of read data bytes.
h
Caution!
Test of the buffer address or the buffer size does not occur!