Re: What is the "best" way to control the #thing#? Message #2 Posted by Thomas Chrapkiewicz on 19 Feb 2008, 2:17 p.m., in response to message #1 by Matti Övermark
RS232 is the simplest method of machine interface.
Pros:
- Simple; that is, easy to understand.
- Generic interface - no drivers required - control can be via simple ascii commands from a simple terminal program(or the HP48 XMIT/SRECV commands).
- Generic Device interface - via a PIC or other simple micro. Simple bit-banging and supported on PIC with High Level Language compilers.
Cons:
- Disappearing (or disappeared) from PCs - although I understand some motherboards still contain the old 'COM' port - they are not wired externally. (There are low cost USB<-> RS232 cables available)
- Slower than USB
When developing #thing# to communicate over RS232, it is helpful to be able to test the #thing# from either the HP48 or the PC, with no drivers or other overhead required.
I've interfaced both generic PICS and X10 controllers to the HP48 successfully.
Regards,
TomCee
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