DTR on PAC

It is necessary is high-grade to test the project for PAC (5500 PACA) on the computer. In the project function of work with COM port is used.

At project start in a mode of emulation exit DTR remains inactive.

For the integrated device it is critical, in what way probably to activate DTR?

 

Actually, the hand-shaking lines in PAC are only used for powering the serial interface. The PAC can not drive these lines. The logic help does say that these functions are for Colour C-Touch only.

 

For testing I used the project of the colour screen with use of function SetSerialDTR... And actually what condition DTR will be on PAC? (Simply there is no possibility now to check up...)

 

In the PAC, DTR is connected to DSR and DCD. RTS is connected to CTS.

The PAC does not put a voltage onto these signals.

 

Badly... And what for at such scheme to it also the separate power unit for com port...

 

This wiring arrangement is the standard "loop back handshaking" arrangement.

The only difference is that the PAC can take power from these connections to power the PAC RS232 transceiver if you don't want to use a separate power supply.