Can I control one line from serial VIs.

[software enigineer]

Hi! All,
My application is developed for RS 232 communicaiton. Now I would like
to add the RS-485 also to it.I am using LV 7.1.
I would like to control one of the lines( any one from DSR, CTS or
RTS) which will send a bit to indicate that it is either a
transmission or receiving bit. After few msec I should be able to send
the actual data or read the actual data.
How can I achieve this using LV serial VIS?

TIA,
Rachana

[Dennis_Knutson]

The only pin that is an output from the pc is RTS. To set this line or to read the state of the other lines, you use a VISA porperty node. Select the property Modem Line Settings.

[software enigineer]

Dennis Knutson wrote in message news:<5065000000050000005FB60100-1079395200000@exchange.ni.com>...
> The only pin that is an output from the pc is RTS. To set this line or
> to read the state of the other lines, you use a VISA porperty node.
> Select the property Modem Line Settings.

Hi! Dennis,
Thanks for the help. I forgot to mention that I am developing the
application for the PDA. Property nodes are not supported on PDA. Is
there any other way to achive this?
For Windows, as you mentioned that I could use the property node, is
there any start up document or example for this? I would like to know
if it is also possible to transmitt data on the Pin 2 and 3, depending
upon if RTS is high bit or low.
TIA,
Rachana

[Dennis_Knutson]

I'm not familiar with the features of the PDA so I don't if there's an alternative. Are you trying to implement your own hardware handshaking because the device or the PDA doesn't support this?