How can I make a simple 1 channel I/O with RS232?

[Petric]

Hy all,

I just want make a simple 1/0 output over RS232. How can I programme it in LabView? Noemaly we send datas over RS232, but I want just a High or a Low on the TxD (or may on DSR or CTS).

Thanks
Petric

[chilly_charly]

The VISA functions allow the control of DTR and RTS (outputts) using property nodes. Other lines are inputs. See the attached vi.
If you are using LV 6, the procedure is different. Just ask if you nedd help...

CC

[Petric]

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@chilly charly wrote:
The VISA functions allow the control of DTR and RTS (outputts) using property nodes. Other lines are inputs. See the attached vi.
If you are using LV 6, the procedure is different. Just ask if you nedd help...

CC

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Thank you CC,

unfortunatly can't I open the VI. It tell's me it's Version 7.1 and I have 6.0.2.

Petric

[chilly_charly]

You are lucky, here is a 6.0 version ... I hope it works 😉

CC

[Petric]

Thank you CC

now I can open it, but the voltage didn't change (I measured between GND (Pin5) and DTR (Pin4)) when I change the state. Which levels should I have with unknown, unasserted or asserted?

Petric

[Petric]

Sorry, it works now!!
I tried it on a other PC (on the old, I have maybe a conflict with the device I normally run at the Com port...) The level is -11V for unasserted and +11V for asserted.

kind regards
Pertic