Advantech PCIE-1816, User Manual, Page: 24 / 62

PCIE-1816_1816H User Manual 18
3.3.1 I/O Connector Signal Description
Table 3.4: I/O Connector Signal Descriptions
Signal Name Reference Direction Pin description
AI[15:0] AGND Input AI Channels 0 to 15. Each channel pair,
AI[i+1:i](i=0,2,4…14), can be configured as either
two single-ended inputs or one differential input.
AGND - - Analog Ground. These pins are the reference
points for single-ended measurements and the
bias current return point for differential measure-
ment. The ground reference (AGND and DGND)
are connected together on the PCIE-1816/
1816H.
ATRG0
ATRG1 AGND Input Analog Threshold Trigger. These pins are the
analog input threshold trigger input.
Digital Trigger. These pins are the digital input.
The left pins are used to start or stop a data
acquisition.
Analog Threshold Trigger and Digital Trigger
are used to execute a specific data acquisition
mode – an acquisition which consists of one or
more scans. And then a data acquisition behavior
needs a stop trigger signal while the pin is used to
stop function. The active edge of the start and
stop function could be programmed to be rising or
falling.
DTRG0
DTRG1 DGND Input
AI_SCAN DGND Input AI Scan Clock. This pin is used to initiate a set of
data acquisition. The card samples the AI signals
of every channel in the scan list once for every AI
Scan Clock.
AI_CONV DGND Input AI Conversion Clock. This pin is to initiate a sin-
gle AI conversion on a single channel. A Scan
(controlled by the AI Scan Clock) consists of one
or more conversions.
AO0_REF
AO1_REF AGND Input AO Channel 0/1 External Reference. This is the
external reference input for the analog output
channel 0/1.
AO0_OUT
AO1_OUT AGND Output AO Channels 0/1. This pin supplies the voltage
output of analog output channel 0/1.
AO_CONV DGND Input AO Convert Clock. This pin is to initiate AO con-
version. Each sample updates the output of all of
the DACs. You can specify an internal or external
source for AO Convert Clock.
DIO[23:0] DGND Input/
Output Digital Input/ Output Channel [23:0]. These
pins are digital input/output which could be con-
figured as general purpose digital inputs or out-
puts.
DGND - - Digital Ground. This pin supplies the reference
for the digital channels at the I/O connector as
well as the +5V and +12V DC supply. The ground
references (AGND and DGND) are connected
together on the PCIE-1816/1816H.
CNT0_CLK
CNT1_CLK DGND Input Counter 0/1 External Clock Input. The clock
input of counters can be either external (up to
10MHz) or internal (20MHz), as set by software.