Measurement-computing UL for NI LabVIEW Manuel d'utilisateur télécharger pdf (Page 94)

Universal Library Virtual Instruments (VIs) Serial VIs

Serial VIs

RS485.VI

Sets the direction of RS-485 communications port buffers..

Summary:

Input: BoardNum [U32] - The board number assigned when installed with InstaCal. Can

be 0 to 100.

Transmit [I32] - Enable (1) or disable (0) the transmit RS-485 line driver.

Receive [I32] - Enable (1) or disable (0) the receive RS-485 buffer.

BoardNum [U32] - The board number assigned when installed with InstaCal. Can

be 0 to 100.

Output:

ErrCode [I32] - Error code. See ErrMsg.VI

Arguments:

BoardNum The number associated with the board when it was installed with the InstaCal

configuration program. BoardNum may be 0 to 99.

Transmit Set to enabled (1) or disabled (0). The transmit RS-485 line driver is turned on.

Data written to the RS-485 UART chip is transmitted to the cable connected to that

port.

Receive Set to enabled (1) or disabled (0). The receive RS-485 buffer is turned on. Data

present on the cable connected to the RS-485 port is received by the UART chip.

ErrCode Error code from the Universal Library. Zero if no error occurred. Use the ErrMsg

VI to convert

ErrCode into a readable string.

Notes:

You can simultaneously enable or disable the transmit and receive buffers. If both are enabled, data written to

the port is also received by the port. For a complete discussion of RS485 network construction and

communication, refer to the CIO-COM485 User's Manual (

www.mccdaq.com/PDFmanuals/cio-com485.pdf).

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Measurement-computing UL for NI LabVIEW Manuel d'utilisateur Page 94