I'm creating a 1way rs232 driver for an Extron Presentation switcher IN1606 and I have everything working except the volume commands (up, down, mute on, mute off).

This is being used in a C4 system. I've tried several ways of doing it, even through an emulator, and can't figure it out. Could someone point me in the right direction please?

I tried copy and paste but doesn't show up correctly so here's my version, if you could follow.

Here's the syntax for volume up: [Esc]D[X43]*[X48]+GRPM carriage return no linefeed (straight arrow pointing to the left)

[X43]= Volume Group number, which is 8
[X48]= Increment Value, which is 100

I've tried= 1BD8*100+GRPM\r with no luck

Also tried converting all of it to hex with no luck.

Many thanks to the ones that help!!