ADLINK DAQe-2214 - Manual (Page 85)

Operation Theory 73
Auxiliary Function Inputs (AFI)
You can use the AFI in applications that take advantage of exter-
nal circuitry to directly control the DAQ-/DAQe-2213/2214 card.
The AFI includes two categories of timing signals: one group is the
dedicated input, and the other is the multi-function input. Table 4-7
illustrates this categorization.
Category Timing signal Functionality Constraints
Dedi-
cated
input
EXTTIMEBASE
Replace the
internal TIME-
BASE
• TTL-compatible
• 1 MHz to 40 MHz
• Affects on both A/D and D/A
operations.
EXTDTRIG
External digital
trigger input for
A/D operation
• TTL-compatible
• Minimum pulse width = 20ns
• Rising edge or falling edge
EXTWFTRG
(for DAQ-DAQe-
2214 only)
External digital
trigger input for
D/A operation
• TTL-compatible
• Minimum pulse width = 20ns
• Rising edge or falling edge
Multi-
function
input
AFI[0]
(Dual-functions)
Replace the
internal
ADCONV
• TTL-compatible
• Minimum pulse width = 20ns
• Rising–edge sensitive only
Replace the
internal
SCAN_START
• TTL-compatible
• Minimum Pulse width > 2/
TIMEBASE
AFI[1]
(for DAQ-DAQe-
2214 only)
Replace the
internal DAWR
• TTL-compatible
• Minimum pulse width = 20ns
• Rising–edge sensitive only
Table 4-7: Auxiliary Function Input Signals and Functionalities