I am trying to write a Xojo app to communicate with a device (a ZVT-ECash Terminal) that is connected to my Mac through a USB/Serial adapter. I am testing my app on OS X and on Windows 7 (running under Parallels). How To Install Crack Office On Macbook Air.

In both cases I'm sending a string (always the same one) through Serial.Write somehow like that: command = chrb(&h10) + chrb(&h02) + chrb(&h06) + chrb(&h00) +chrb(4). Serial1.Write(command) Serial1 is an instance of the Serial control.

This string is acknowledged by the device as a valid command when I run my app on Windows and is not acknowledged on OS X (the device answers with a NAK). On OS X I have also tried to send the same string manually with CoolTerm and it was not acknowledged either. What am I doing wrong? Is it some problem with the Serial control in Xojo, and/or is there some general difference in how the serial port works under Win and OS X? I have run into similar problems myself just recently.

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Turned out it had nothing to do with Xojo (even though CoolTerm is written in Xojo as well). The problem was with the OS X driver for the adapter that is using the '2303' Prolific chip. I found that both the driver by Prolific and the open source version (osx.pl2303) had issues: The former did not always set the baud rate correctly whereas the latter did not handle the hardware handshake properly.

My solution was to purchase the driver from - it was the only one that worked for me on OS X with two different 2303-based adapters.