MSCOMM : How to send hex value through Com1?

[Jasonsjwou]

Hello all

I've got a video machine which has RS232 port. The manual shows all available functions and the corresponding code. For example it says:

PowerOn 08H
PowerOff 09H
RotateLeft 33H
RotateRight 44H

So in a code, I am basically writing hex$(08) to the RS232port.. but it doesn't work. Weird thing is, if I write hex$(03), then the screen rotates left! hex$(04) rotates the screen to right. These two are the only two (out of 50) that I can sort of make it work.

Any ideas as to what I am doing wrong? I am guessing that there's no fault in Electrical connection since they are at least talking to each other.

Thanks.

[Markus W.]

I imaging , you will have to send the character code and not the decimal value converted
to hex string. E.g if you send hex$(03) you send '3' and that's character code 33H.

Try to use chr(&H33),chr(&H09)... instead.