Then it's probably only their RS232 <--> TTL converter for the I/O pin
left to blame. If you like hardware, and wants to confirm it, hook up
an oscilloskope. One channel to the RS232 side, and one to the smart card
I/O side. Then, just look what the converter does to your nice 115k2...
Just an ignorant question: does any of the readers have an own power
supply, or ar both the "stealing what it can from the COM port" kind?
The ones feeding on the COM port has a tricky power budget, and often works
with small margins to the RS232 spec. They also use often use discrete
converters, which are fairly easy to design at 9600 bps, but requires more
care to do 115k2. Thus if they are not designed for more than 9600, they'll
hardly do much more.
A reader with its own supply is more likely to have a full-blown TTL-RS232
converter (like an ADM207), since it can afford the power (and $$ ;-) for it.
/Morten
At 22:08 1999-03-15 -0500, you wrote:
> I think this reader belongs to the category "dumb readers". To make
> things simple and cheap, they usually have a fixed 3.57 MHz clock to
> the card, thus yielding 9600 bps as default I/O speed. Then they more
> or less just connects I/O to the COM port.
>
>Yes, that's correct. My driver now sends the pps to raise the card speed,
>and sets the port speed to match. It works with a PC3 dumb reader, but not
>with the Todos. So there is something about the Todos that prevents this
>from working.
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