On older versions of PICAXE VSM the AXE033 Serial LCD model defaults to T2400 polarity baud rate, whereas a real life part defaults to N2400.
Fortunately is it very easy to invert the RXD pin on the model so that it will now work with a N2400 polarity signal.
To do this:
1) Right click over the 'AXE033 Serial LCD' model and click 'Edit Properties'.
2) Check the 'Edit all properties as text' box
3) Add this new text on a new line
{INVERT=RXD}
4) Click OK
The RXD pin will now 'invert' the signal, and hence work at the N2400 baud rate instead of the T2400 baud rate.
Fortunately is it very easy to invert the RXD pin on the model so that it will now work with a N2400 polarity signal.
To do this:
1) Right click over the 'AXE033 Serial LCD' model and click 'Edit Properties'.
2) Check the 'Edit all properties as text' box
3) Add this new text on a new line
{INVERT=RXD}
4) Click OK
The RXD pin will now 'invert' the signal, and hence work at the N2400 baud rate instead of the T2400 baud rate.