RS232 interface in transparent
mode (COM 1/2/3)
03/05 AWB2724-1453G
68
“SysComReadControl” function
With the onboard RS232 interface of the CPU101 the control
cables/lines are not available. Therefore, the “SysComReadCon-
trol” module is not to be used for this interface.
The XIOC-SER hardware interface module avails of control/inter-
face lines. This allows the “SysComReadControl” module read
access to the control/interface lines of the COM2 and COM3 inter-
face.
Table 19: Parameters of the “SysComReadContro” function
Figure 95: Read access to the control/interface lines of the COM 2 or COM 3 interface
dwHandle
Return value of the “SysComOpen” function
Control COM 1: Function discontinued
COM 2, COM 3: TRUE = read command on the control lines of the hardware interface
SysComReadControl COM 1: Function discontinued
COM 2, COM 3: TRUE = read command was successful; FALSE = read command was not successful
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