User manual

Chapter 3 Software Overview
© National Instruments Corporation 3-105 NI-DAQ User Manual for PC Compatibles
The signals REQ1 and REQ2 are request signals received from the I/O
connector. An external device drives these signals during handshaking.
ACK1 and ACK2 are supplied for handshaking with the DIO-32F over the
RTSI bus. For more information about the DIO-32F signals, see the
AT-DIO-32F User Manual.
653X RTSI Connections
The 653X devices (except for the DAQCard-653X) contain eight signals
that you can connect to the RTSI bus trigger lines. Table 3-11 shows these
signals.
The direction of each signal depends on the function you are performing.
Some signals have a different direction when you enable pattern generation
using
DIG_Block_PG_Config
than when you leave pattern generation
disabled. Make sure that you do not configure a signal as a RTSI receiver
when you use that signal as a device output. For example, do not configure
the 653X device to receive the REQ1 line from the RTSI bus if you are using
internal requests, or if you have made an external connection that drives the
REQ1 pin on the I/O connector.
Table 3-11.
653X
RTSI Bus Signals
Signal Name
Signal Direction
(Pattern Direction)
Signal Direction
(Handshaking,
No Pattern Generation)
Signal Direction
(No Handshaking)
Signal Code
REQ1 Receiver (external
requests) or source
(internal requests)
Receiver Receiver 0
REQ2 Receiver (external
requests) or source
(internal requests)
Receiver Receiver 1
ACK1 Receiver
(STARTTRIG1)
Source Source 2
ACK2 Receiver
(STARTTRIG2)
Source Source 3
STOPTRIG1 Receiver Unused Receiver 4
STOPTRIG2 Receiver Unused Receiver 5
PCLK1 Unused Source (internal clock) or
receiver (external clock)
Source 6
PCLK2 Unused Source (internal clock) or
receiver (external clock)
Source 7