ADLINK PXIe-9852 - Manual (Page 40)

30 Operations
Trigger Mode” on page 22. and “Middle Trigger Mode” on
page 23.). This slave device should set one PXI_BUS pin, not
used to transmit and receive SSI_TRIG1, to output to transmit its
pre_data_ready signal to master device. If any other slave device
is in pre-trig/mid-trig mode, it should set another PXI_BUS pin to
send its pre_data_ready signal. In this scenario, a single line on
PXI_BUS is used to transmit trigger signals from master to slave,
while other specified lines are used to transmit pre_data_ready
signals from slave devices in pre-trig/mid-trig mode to a master
device. From the master device, one pin is assigned as output to
transmit trigger signal. The trigger signal won’t be sent out until all
slaves’ pre_data_ready is received by the master device.