OpenComConfig sets the bad baud rate

-WinXP

-CVI 9.0.1 VERSION

-7904 compact PCI sea level

-COM1 on motherboard

When I open a port at 115200 baud, it opens in reality at 9600 baud.

My software uses OpenComConfig (115200) but the serial port will eventually be open to all that

"setting of the operating system" is for the port in the control panel.

This does not occur when you use HyperTerminal

As soon as the INVALID PARAMETER (line 10 below) is detected, the port is REOPENED to the configuration of the system instead of my bad = OpenComConfig (port, ' ", 115200, 2, 8, 1, 50000, - 1);
No error is returned by this function.

Activity captured for the serial port for OpenComConfig() port monitor is:

0.00021036 0 84615u.exe IRP_MJ_CREATE Seacom2k10 SUCCESS Options: open
1 0.00000391 84615u.exe IOCTL_SERIAL_GET_BAUD_RATE Seacom2k10 SUCCESS
2 0.00000279 84615u.exe IOCTL_SERIAL_GET_LINE_CONTROL Seacom2k10 SUCCESS
3 0.00000279 84615u.exe IOCTL_SERIAL_GET_CHARS Seacom2k10 SUCCESS
4 0.00000251 84615u.exe IOCTL_SERIAL_GET_HANDFLOW Seacom2k10 SUCCESS
5 0.00001117 84615u.exe IOCTL_SERIAL_SET_BAUD_RATE Seacom2k10 SUCCESS rate: 115200
6 0.00000670 84615u.exe IOCTL_SERIAL_SET_RTS Seacom2k10 SUCCESS
7 0.00000643 84615u.exe IOCTL_SERIAL_SET_DTR Seacom2k10 SUCCESS
8 0.00000475 84615u.exe IOCTL_SERIAL_SET_LINE_CONTROL Seacom2k10 SUCCESS StopBits: 1 parity: EVEN WordLength: 8
9 0.00000307 84615u.exe IOCTL_SERIAL_SET_CHAR Seacom2k10 EOF:0 SUCCESS ERR: ff BRK: ff EVT:0 XON:11 XOFF:13
INVALID PARAMETER to 10 0.00000251 84615u.exe IOCTL_SERIAL_SET_HANDFLOW Seacom2k10 XoffLimit:5000 of XonLimit:5000 to replace: 40 Shake: 1
11 0.00000251 84615u.exe IOCTL_SERIAL_GET_BAUD_RATE Seacom2k10 SUCCESS
12 0.00000223 84615u.exe IOCTL_SERIAL_GET_LINE_CONTROL Seacom2k10 SUCCESS
13 0.00000251 84615u.exe IOCTL_SERIAL_GET_CHARS Seacom2k10 SUCCESS
14 0.00000251 84615u.exe IOCTL_SERIAL_GET_HANDFLOW Seacom2k10 SUCCESS
15 0.00001062 84615u.exe IOCTL_SERIAL_SET_BAUD_RATE Seacom2k10 SUCCESS rate: 115200
16 0.00000670 84615u.exe IOCTL_SERIAL_CLR_RTS Seacom2k10 SUCCESS
17 0.00000643 84615u.exe IOCTL_SERIAL_SET_DTR Seacom2k10 SUCCESS
18 0.00000419 84615u.exe IOCTL_SERIAL_SET_LINE_CONTROL Seacom2k10 SUCCESS StopBits: 1 parity: ODD WordLength: 8
19 0.00000307 84615u.exe IOCTL_SERIAL_SET_CHAR Seacom2k10 EOF:0 SUCCESS ERR: 0 BRK:0 EVT:0 XON:11 XOFF:13
20 0.00000475 84615u.exe IOCTL_SERIAL_SET_HANDFLOW Seacom2k10 Shake SUCCESS: 1. replace: 0 XonLimit:2048 XoffLimit:512
21 0.00000251 84615u.exe IOCTL_SERIAL_GET_BAUD_RATE Seacom2k10 SUCCESS
22 0.00000223 84615u.exe IOCTL_SERIAL_GET_LINE_CONTROL Seacom2k10 SUCCESS
23 0.00000223 84615u.exe IOCTL_SERIAL_GET_CHARS Seacom2k10 SUCCESS
24 0.00000251 84615u.exe IOCTL_SERIAL_GET_HANDFLOW Seacom2k10 SUCCESS
25 0.00001006 84615u.exe IOCTL_SERIAL_SET_QUEUE_SIZE Seacom2k10 SUCCESS Insizing: 50000 out: 0
26 0.00000279 84615u.exe IOCTL_SERIAL_SET_TIMEOUTS Seacom2k10 RI SUCCESS: RM:0 - 1 RC:0 WM:0 WC:0

Sorry, I think that the limit error XON/XOFF wrong main to assume that you were actually using handshaking, but never, you indicated that you were. This problem that you mention actually open any port, regardless of whether you use XON/XOFF handshaking. The limit of 4096 seems to be imposed by the driver, so it is not something that can be changed in the CVI code layer. However, we can impose a maximum of 4096 for XON/XOFF limits, that we spend in the Windows SDK, so that the error can be avoided when you are booking a superior to 40960 input buffer.

We will do both the fixes mentioned in this thread in the next version.

A. Mert

National Instruments

Tags: NI Software

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