psg@philabs.philips.com (Prabha Gopinath) (05/09/90)
It has been a while since I did any ckt design or looked into any data books and hence this question: I need to hook up my HP48SX calculator to a camera and some on/off type sensors. The HP48 has a 9 pin RS232 line. The camera has a 6-pin din socket which fires the shutter and also sets the shutter speed and single exp and multiple exposure modes. It also outputs the status of the camera (shutter fired okay, film exhausted, not enough light, flash charged etc.). I think what I need here is a two-way RS232 to 8-bit parallel converter, something which takes serial in, and latches out an 8-bit value. In my naivete I feel that such a chip should be available off the shelf. Is it? I have used UARTS but I think the necessary logic to configure it would be way too much for this application. It would help a great deal if the whole thing could be battery-powered. Any ideas? BTW why I need this: 1. Take N shots at time intervals of t secs and at a base exposure of T secs. 2. Take N n-shot bursts at intervals of t secs and a base exposure of T secs. 3. Take N 3-shot bursts at intervals of t secs and bracketed at -2/3 stop, +0 stop, and +2/3 stop. 4. Do each of the above NOW, or NOW+DELAY, or NOW+EVENT, or NOW+EVENT+DELAY. regards prabha gopinath -- Prabha Gopinath (914)-945-6539 (m/c) Philips Research Laboratories email: psg@philabs.philips.com 345 Scarborough Road FAX: (914)-945-6375 Briarcliff Manor,NY 10510