National Instruments Welding System 321645c-01 Manual De Usuario

Chapter 2

Function Reference — DIG_Prt_Status

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 National Instruments Corporation

2-187

NI-DAQ FRM for PC Compatibles

DIG_Prt_Status

 reads the handshake status of the specified port and returns the port status 

in handshakeStatus. 

DIG_Prt_Status

, along with 

DIG_Out_Port

 and 

DIG_In_Port

, 

facilitates handshaking of digital data between systems. If the specified port is configured 
as an input port, 

DIG_Prt_Status

 indicates when to call 

DIG_In_Port

 to fetch the data 

that an external device has latched in. If the specified port is configured as an output port, 

DIG_Prt_Status

 indicates when to call 

DIG_Out_Port

 to write the next piece of data to 

the external device. If the specified port is not configured for handshaking, NI-DAQ returns 
an error code and handshakeStatus = 0.

Refer to your device user manual for handshake timing information. If the port is configured 
for input handshaking, handshakeStatus corresponds to the state of the IBF bit. If the port 
is configured for output handshaking, handshakeStatus corresponds to the state of the 
OBF* bit.

DIG_Prt_Config