No connector pins for ATN

DG

How does the programming handshake work?· I am developing a product that does not have enough connector pins for the ATN line.· I would like the ability to reprogram the controller in the rare event an update is required.· Is there a method I can use to reprogram the BS2-IC using a push button on the board or something?· The device will be soldered in and in fact, the entire circuit will be encapsulated.
Thanks

Newzed

To program a Stamp you must connect your programming cable to Pins 1, 2, 3 and 4 of the Stamp.· This can be done with a DB9 connector, or a 4-pin connector that will mate with Pins 2, 3, 4 and 5 of the DB9.· The DB9 must also have Pins 6 and 7 shorted together.

Sid

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allanlane5

Yup, if you include a little 4-pin header next to your BS2-IC, along with the appropriate level shifting circuit (assuming you've left off the TX/RX transistors on an OEM BS2-IC) then you can build a simple DB-9 to 4-pin adapter to plug to those 4 pins that will let you program it.

DG

Alan,
Thanks for the idea about the 4-pin header. This would be an inexpensive solution for a parallel connector to the main connector for the purpose of programming. I could even eliminate the two capacitors on the ATN line using this method--my main connector to the outside world is small and only has 4 pins, one of which will be to power the device.
Thanks,
Dale