03/05 AWB2724-1453G
Demands placed on the func-
tionality of the transparent
mode
69
“SysComWriteControl” function
With the integrated RS232 interface of the CPU101 the control
cables/lines are not available. Therefore, the “SysComWriteCon-
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 “SysComWriteControl” module write
access to the control/interface lines of the COM2 and COM3 inter-
face.
Table 20: Parameters of the “SysComWriteControl” function
Automatic closing of the interface
The transparent mode is automatically ended by the operating
system with a PLC state change of the XC100 to STOP. The inter-
face is initialised again with the interface parameters last set.
Figure 96: Write 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 = write command on the control lines of the hardware interface
SysComReadControl COM 1: Function discontinued
COM 2, COM 3: Feedback: TRUE = read command was successful; FALSE = read command was not successful
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