National Instruments 321645c-01 用户手册

Chapter 2

Function Reference — DIG_Grp_Status

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 National Instruments Corporation

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NI-DAQ FRM for PC Compatibles

Returns a handshake status word indicating whether the specified group is ready to be read 
(input group) or written (output group). For the DIO 6533 (DIO-32HS), this function also 
initiates the handshaking process if not previously initiated.

group is the group whose handshake status is to be obtained.

Range:

1 or 2.

handshakeStatus returns the handshake status of the group. handshakeStatus can be either 
0 or 1. The significance of handshakeStatus depends on the configuration of the group. If 
the group is configured as an input group, handshakeStatus = 1 indicates that the group has 
acquired data and that NI-DAQ can read data from the group. If the group is configured as an 
output group, handshakeStatus = 1 indicates that the group is ready to accept output data and 
that NI-DAQ can write new data to the group.

DIG_Grp_Status

 reads the handshake status of the specified group and returns an indication 

of the group status in handshakeStatus. 

DIG_Grp_Status

, along with 

DIG_Out_Grp

 and 

DIG_In_Grp

, facilitates handshaking of digital data between systems. If the specified group 

is configured as an input group and 

DIG_Grp_Status

 returns handshakeStatus = 1, 

i16

assigned by configuration utility

i16

group

i16

handshake status