Keithley DAS-1800ST Series User Manual page 80

In scheme 2, you can start conversions in either of two ways: by a
hardware trigger/gate input or by software. The board connections are in a
master/slave relationship; board 0 is the master, and boards 1 and 2 are
the slaves.
If you use a software enable for board 0 of scheme 2, the board 0 pacer
clock starts and triggers conversions in the slave boards. However, board
0 conversions do not begin until after conversions begin in the slave
boards. The delay of board 0 conversions is caused by a protection feature
built into the register that creates software-triggered conversions; the
function of the protection feature is to prevent false conversions.
If you use a hardware trigger for board 0 of scheme 2, board 0 triggers
conversions in all three boards immediately. Note that TGOUT is an
active, high-going signal. Therefore, you must program the slave-board
TGIN inputs for a positive-edge trigger or gate.
Connecting Signals 4-19
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