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Chapter 5 RS-232 Library
© National Instruments Corporation 5-27 LabWindows/CVI Standard Libraries
Parameters
Input
COMPort
integer Range 1 through 32.
deviceName
string Name of the COM port.
baudRate
long Either 110, 150, 300, 600, 1200, 2400, 4800,
9600, 14400, 19200, 28800, 38400, 56000,
57600, 115200, 128000, or 256000.
SPARCstations do not support 14400, 28800,
56000, 57600, 115200, 128000, and 256000.
PCs do not support 150. Some PC serial
drivers do not support 115200, 128000,
and 256000.
parity
integer
0—no parity.
1—odd parity.
2—even parity.
3—mark parity.
4—space parity.
dataBits
integer Either 5, 6, 7, or 8.
stopBits
integer Either 1 or 2.
inputQueueSize
integer 0 selects 512. See discussion below.
outputQueueSize
integer 0 selects 512. See discussion below.
Return Value
result
integer Refer to error codes in Table 5-6.
Parameter Discussion
deviceName is the name of the com port in the ASCII string. For example, COM1 for com port 1
on Microsoft Windows using COMM.DRV, and /dev/ttya for com port 1 on UNIX using the
Zilog 8530 SCC serial comm driver.
If you pass a NULL pointer or an empty string for deviceName, the library uses the following
device names depending on the COM port number you have specified.
Port Number deviceName on Windows deviceName on UNIX
1 “COM1” “/dev/ttya”
2 “COM2’ “/dev/ttyb”
3 “COM3” “/dev/ttys1”
4 “COM4” “/dev/ttys2”
and so on