Manual BG41/BG42/BG43 Startup
Rev. 99/49 5-19
5.5.2 Application of the diagnostic interface
As it is becoming more important to monitor the data exchange between the PLC and the peripheral,
VIPA building blocks have a separate interface. On this interface the time telegram is available
when using the DCF77 antenna module.
When using serial interface modules, the interface signals (Rx and Tx) are made available as a TTL-
level on the diagnostic interface.
VIPA offers a diagnostic adaptor for connecting it to your PC. The adaptor cable is connected to
both of the serial interfaces on your PC. The TTL signal is converted to the RS232C signal on the
diagnostic adaptor.
With suitable diagnostic software one can analyse the signal flow on one’s own PC and thereby
examine the function of your serial interface.
Fig. 5-9:How the diagnostic adaptor works
Using the RS485 or RS485/422P module the diagnostic interface can only be
used restricted.
This modules are't able to run in full duplex operation, that means if the
receive channel (RXD) isn't active the send channel (TXD) is operating!.
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