Serial Communication freezes Mac OSX 10.74

[barddya]

I am trying to communicate with a serial device using a USB adapter on a MiniMac OSX 10.7.4. I am using Labview 2011 SP1 and I have installed serial drivers 5.1.1

I have a major issue here (which does not exist with the sam hardware and a PC)

With this decice I need to send commands to the device and then device sends back several line (two to 3 pages) of respond.

The problem is that everytime I send a command to the unit, I do not read the buffer empthy,then the whole MavMini freeses and have no choice other than a cold boot.

Serial communication is the basis of the job I am doing and this nasty bug must be solved before I can go on.

What Can I do to get imediate help?

Any body here has had the same issue?

any hint may help.

Rgards,

Behzad

[RavensFan]

Is the serial buffer larger enough for this serial port?

Is the amount of data "several lines" or "2 to 3 pages"?  That is a big difference.  And I'm sure 2 to 3 pages of data coming in at once would be enough to overflow a serial buffer.

What device are you trying to communicate with?  Does it require any handshaking, either software or hardware?

[johnsold]

What USB to RS-232 adapater are you using? The ones with the FTDI chip seem to work well, while the ones with the Prolific PL2303 chip are quite tricky to use.

Lynn