I'm also trying to get an Alaris pump to work. Does anyone know if a special cable is needed?

Also can anyone confirm the flow settings? eg RTS/CTS or XON/XOFF or none?

I'm currently trying to use the string earlier up the thread, do you just send this:

21 49 4E 46 7C 34 39 36 31 0D

Or are slashes needed? Or remove all the spaces?