Remote Shutter Control Box Description -------------------------------------- The BC-016 circuit has 6 inputs, 12 outputs, and 2 modes of operation. The 6 inputs are TTL-compatible. there are two outputs (relay contact closures) per input. For each "channel" (1 input and its associated 2 outputs) there are 2 switch selectable modes of operation. These are one-shot mode and continuous mode. In one-shot mode, there is a positive edge triggered circuit and a negative edge triggered circuit. If either of these events occur, a contact closure of ~1 sec. will be in effect on the appropriate output (see chart below). When switched to continuous mode, a TTL high on the ch1 input will result in a contact closure on the "pos trig'd 1" output. A TTL low will open the contacts. The "neg trig'd 1" output is simply inverted. The following charts summarize the circuit's operation for each channel. ONE SHOT MODE: IN | pos-trig neg-trig ----------------------- RE | _/-\_ OPEN | Note: RE=Rising Edge, FE=Falling Edge FE | OPEN _/-\_ _/-\_ = open, closed, open; ~1 sec. CONTINUOUS MODE: IN | pos-trig neg-trig ----------------------- 0 | OPEN CLOSED | 1 | CLOSED OPEN Pinout for the Remote Shutter Controller's db25 (F): 1 ... pos trig'd 1 + 14 ... pos trig'd 1 - 2 ... neg trig'd 1 + 15 ... neg trig'd 1 - 3 ... pos trig'd 2 + 16 ... pos trig'd 2 - 4 ... neg trig'd 2 + 17 ... neg trig'd 2 - 5 ... pos trig'd 3 + 18 ... pos trig'd 3 - 6 ... neg trig'd 3 + 19 ... neg trig'd 3 - 7 ... pos trig'd 4 + 20 ... pos trig'd 4 - 8 ... neg trig'd 4 + 21 ... neg trig'd 4 - 9 ... pos trig'd 5 + 22 ... pos trig'd 5 - 10... neg trig'd 5 + 23 ... neg trig'd 5 - 11... pos trig'd 6 + 24 ... pos trig'd 6 - 12... neg trig'd 6 + 25 ... neg trig'd 6 - 13... NC Note: The "polarity" of these signals is irrelevant since they're relay contacts.