NPort 1200/1240 User’s Manual

Technical Refernece

 

fRtsControl=RTS_CONTROL_DISABLE

 

fRtsControl=RTS_CONTROL_ENABLE

 

fDtrControl=DTR_CONTROL_DISABLE

 

fDtrControl=DTR_CONTROL_ENABLE

 

FDsrSensitivity=TRUE

11.SetCommTimeouts

ReadIntervalTimeout

 

ReadTotalTimeoutMultiplier

 

ReadTotalTimeoutConstant

 

WriteTotalTimeoutMultiplier

 

WriteTotalTimeoutConstant

12. HWFlowContrl()

dcb.fRtsControl=RTS_CONTROL_HANDSHAK

 

E

13. ReadFile()

 

General Technical Reference

Question 1

Why does the port stop responding when I use a program to fast open/close the port? On the other hand, if I just do a normal port open/close, the port will stop responding after about 100 times. In a related problem, if I use the port on a dial-up network, the port will sometimes stop responding, or when I add a new modem under Windows XP, the port will be dead the first time I use the modem.

Answer 1

For all of these problems, simply unplug and then re-plug NPort 1220/1240 from the computer’s USb port.

Question 2

NPort 1220/1240 currently supports baud rates from 600 bps to 115200 bps. However, if I set an invalid baud rate, such as 300 bps, the driver does not return an error.

Answer 2

This problem stems from the fact that some Windows operating systems do not alert the user to the baud rate limits of connected devices.

Question 3

Why is it that when I use NPort 1220/1240 under Windows XP, the OS loading is sometimes around 45%?

Answer 3

This problem is a common characteristic that appears when using USB devices under Windows XP.

A-4

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Moxa Technologies 1240, 1220 user manual General Technical Reference, Question

1240, 1220 specifications

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