Serial Settings:Flow Control

LabVIEW 2018 Help


Edition Date: March 2018
Part Number: 371361R-01
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Short name: Flow Cntrl

Requires: Base Development System

Classes: Instr, Serial Instr

Specifies the flow control method used for both transmitting and receiving data. Valid values include: (0) Flow None, (1) Flow XON/XOFF, (2) Flow RTS/CTS, (3) Flow XON/XOFF and RTS/CTS, (4) Flow DTR/DSR, (5) Flow XON/XOFF and DTR/DSR. Certain values or combinations of values may not be supported by all serial ports and/or operating systems.

Descriptions

(0) None—Does not use flow control, and buffers on both sides of the connection are assumed to be large enough to hold all data transferred.

(1) XON/XOFF—Uses the XON and XOFF characters to perform flow control. The transfer mechanism controls input flow by sending XOFF when the low-level I/O receive buffer is nearly full, and it controls the output flow by suspending transmission when XOFF is received.

(2) RTS/CTS—Uses the RTS output signal and the CTS input signal to perform flow control. The transfer mechanism controls input flow by unasserting the RTS signal when the low-level I/O receive buffer is nearly full, and it controls output flow by suspending the transmission when the CTS signal is unasserted.

(3) XON/XOFF and RTS/CTS—Uses both values 1 & 2.

(4) DTR/DSR—Uses the DTR output signal and the DSR input signal to perform flow control. The transfer mechanism controls input flow by unasserting the DTR signal when the low-level I/O receive buffer is nearly full, and it controls output flow by suspending the transmission when the DSR signal is unasserted.

(5) XON/XOFF and DTR/DSR—Uses both values 4 & 5.

Values

0 None
1 XON/XOFF
2 RTS/CTS
3 XON/XOFF & RTS/CTS
4 DTR/DSR
5 XON/XOFF & DTR/DSR

Remarks

The following table lists the characteristics of this property.

Data type
Permissions Read/Write

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