IR HELP

[jerry w]

this brings up an important point about error detection. a good programmer will be able to provide an error indication.

at no time should all 4 decoder lines be high. one line will pulse high for 100 ms, which is long enough to be detected during 3 RC-cycles. if any line stays high for more than 5 cycles in a row, it is likely that the wire is disconnected between RC and decoder. the line will float high when the wire is broken.

as your software reads the decoder bits, only one bit should be active at a time. it might be a good idea to light an error light on the OI console to alert the wiring crew to the problem if more than one decoder bit goes high at the same time.

jerry w