Howdy David,
On 13 Jul 2005, at 12:56, David Given wrote:
The plastic box the PCB is inside has a space for a switch, marked L and R, but there is no switch there and there are no pads on the PCB for installation of one. I suspect someone's been saving money.
Sounds like mine - box-wise - though the PCB is different.
I can't tell whether my device is set up for 5V or 3.3V; I'll just have to plug it in and measure it. Is it known that the E2 *doesn't* work with 3.3V? And what's the modification I need to do?
Yeah that's probably the best way - see if TxD is 5V or 3.3V. The real issue isn't whether the E2 will talk at 3.3V (IIRC it /does/ work at this voltage) but whether you'll zap the input on the PL2303 by driving 5V into a 3.3V input.
*reads datasheet, which always helps* OK, no, you should be alright :-) It says the inputs are always 5V-tolerant. So, it will probably Just Work - cross the voltage-too-low bridge if you come to it. (Modify the cable to run I/O at 5V rather than 3.3V if necessary.)
Good luck!
-Matt