The HP 34E Ir with PANAMATIK ACT

[PANAMATIK]

(10-04-2015 04:10 AM)Dave Frederickson Wrote:  Here's the problem. The ACT won't program when plugged into the 25. Unplugged it programs fine.

Dave

Hello Dave,

Your idea to place the USB/RS232 converter inside the calculator does not match with the constraint that the ACT 5-pin connector has to be connected AFTER the RS232 TX pin has been pulled to low level. See ACT manual description. I assume that the TX voltage level of your converter is undefined at power up and therefore you can enter the bootloader only by chance.

The sequence must be: plug in converter, then start flash update application and select COM port, then connect to ACT with TX pin before or simultanuously to VCC.

I'm sorry that this at the first glance elegant idea cannot reliably invoke the ACTs boot loader.

To follow Geoffs protocol is however the correct idea.

Bernhard