Serial Port Downloads to 41CL

[rwiker]

(02-25-2015 02:07 PM)rprosperi Wrote:  

(02-25-2015 05:40 AM)rwiker Wrote:  It may also be the cable itself... if you have a multimeter, you should be able to check the cable (check that there are no shorts between the rings on the minijack, and that the signals from the minijack appears at the expected pins on the DB9 end).

This is simple enough and a good idea; I found the section at the back of the CL manual late last night on the serial cable and had the same thought, though for a manufactured cable one wouldn't expect this type of problem. While I hope it's not this, I hope it is this, if you know what I mean.

Could it be that the cable you have is simply wrong for connecting the HP41CL to a PC-style RS232 port? I'm pretty sure I've heard of cables that that appear identical to the one that works for the HP41CL, but has different internal connections.

Back in 2011, one of the early HP41CL owners had problems that may have been caused by the cable (which was also a manufactured cable); I'm not sure if buying a new cable solved his problems.