Serial Time Out Labview Vi

I'm very new to labview (like 2 days experience) but I am getting confused by serial timeout. My device is a DigiX (digistump, some what like an Arduino) board. At first I was getting a read timeout error as the default for the visa config seria vi is to use a termination character.

The board I'm communicating with has no termination character. After searching the this forum and setting the Terminal Char Enable to false (Block Diagram) still getting a read timeout error (same error it seems most newbies get: Timeout expired before operation complete). After looking at more posts on this forum I noticed some suggestions about putting timers between the serial write and read and some suggestions to use Bytes at Port to input to the read. So I now have a write followed by a 50ms timer followed by a Bytes at Port and then the read. Here's the problem. I get a status code (, number of bytes transferred is equal to the input count) which is not an error but when I run this it takes the full 10 seconds of the visa serial timer to complete.

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Can someone explain what is going on (in the visa config serial vi Front Panel the termination character seems to always return to LF even when I try setting to 0, is it possible putting the timer and Byte at Port are masking an underlying problem)? Thanks in advance for any help.

Please explain me what is TIMEOUT in serial communication. By my knowledge it is time required to receive a reply from port after transmitting a querry. M using basic serial read write example in which timeout mentioned is 10 sec.

Solution There are several reasons why you might receive this error message, the most common of which are detailed below: A) You may not have the correct driver installed. Ensure you have the right driver for your hardware. Some common ones are: • (for instruments using serial or GPIB communications) • (for instruments using serial communication as RS232, RS422, RS485, etc) • (for instruments using GPIB communications) Note: You must install NI-488.2 driver software before installing any new NI GPIB hardware devices so Windows can detect them.

Also ensure that you have the installed. Compatibility information can be found in the readme file for your driver.

B) The port isn’t connected, the wrong port is selected, or the port is not being able to send/receive data. Check the instrument is properly plugged in to the port you're using. C)Try a different system with the same drivers.

The COM ports could be corrupted or not working in the original machine. D) A timeout error could also result from the wrong command strings written to the drivers. Check the command strings sent to the VISA Read and VISA Write calls and ensure that they are written in the proper syntax for your instrument. Note: A new line or carriage return is often required at the end of a command.

A good way to test this in LabVIEW is to right-click the command string control on the front panel and change the display to ' ' Codes Display mode. In this mode, a carriage return is r, a line feed is n, and an end of line is r n. Consult your product's manual to learn which is expected, and be sure to consistently use the appropriate option. E) The port's communication settings may not be configured correctly. Verify that the Baud Rate, Data Bits, Parity, Stop Bits, and Flow Control are set correctly to correspond with your hardware requirements. Note: You can change these settings programmatically during run-time with VISA VIs, or in NI-MAX as in the example below: F) This error may be induced by attempting to read more bits than are available at the serial port.

F.1) The VISA Property Node for Bytes At Port should be implemented to ensure that the data read by VISA is limited to exactly the amount of data available. F.2) Additionally, you can verify that you are not trying to read too many bytes by reading only 1 byte at a time. If you do not get the error when doing so, increment the number of bytes you read until you get the timeout error again.

This tells you how many bytes that command sends back. Note: If you still receive the error while reading only 1 byte, verify the command to make sure it has been written correctly and that you have also terminated the command string correctly (as brought up in solution C). G) Older instrumentation may not respond rapidly to commands written to the port, causing a large delay between VISA Write and VISA Read commands. Applications designed to interface with this type of instrumentation should anticipate this delay, and implement a Wait function between VISA Write and Read to effectively avoid a potential timeout error. H) Timeouts can also occur when you read or write large amounts of data, since large data sets often take longer than the default timeout period of 2000 ms to transfer across the serial port.