RS232 Read Problems

[v_pat]

Hello,
I am currently writing a VI using LabVIEW 6.0 to obtain data from a RS 232 serial device (The Orion SA 720 pH/Thermometer). I only need to read from the device and have run into some problems:

1) The VI will SOMETIMES time out when I run it. I don't know why it times out only sometimes but if it does and I restart the computer it doesn't time out after that.

2) The VI is not picking up any data when trying to read (0 Bytes At Port). I've used hyperterminal and am able to establish both read and write communication with the device.

The device manual gives me the following commands to control the device:

Hex Function
^A 01 Changes Mode
^B 02 Changes Function
#X CR 23OD Enters numeric value into meter memory
*where X is some number
*CR - performs auto zero and print result

Example: ^A2 CR - Select and print temp

^A Modes: relative mV, temperature, pH, and ionic concentration.
^B Funct: sample, calibrate, iso, and slope.

Attached is a copy of my VI any input appreciated. Im new at this.
Thanks!

[pmcclung]

---

@v_pat wrote:
Hello,
I am currently writing a VI using LabVIEW 6.0 to obtain data from a RS 232 serial device (The Orion SA 720 pH/Thermometer). I only need to read from the device and have run into some problems:

1) The VI will SOMETIMES time out when I run it. I don't know why it times out only sometimes but if it does and I restart the computer it doesn't time out after that.

2) The VI is not picking up any data when trying to read (0 Bytes At Port). I've used hyperterminal and am able to establish both read and write communication with the device.

The device manual gives me the following commands to control the device:

Hex Function
^A 01 Changes Mode
^B 02 Changes Function
#X CR 23OD Enters numeric value into meter memory
*where X is some number
*CR - performs auto zero and print result

Example: ^A2 CR - Select and print temp

^A Modes: relative mV, temperature, pH, and ionic concentration.
^B Funct: sample, calibrate, iso, and slope.

Attached is a copy of my VI any input appreciated. Im new at this.
Thanks!

---

Does this VI help?

- Paul

[v_pat]

Sorry, have LabVIEW 6.0 cant open the file.. Maybe if you could take a screen shot or something?

Thanks

[pmcclung]

I tried to save the file as a labview 6 file, but labview encountered some errors. Here are some screenshots.

[pmcclung]

Another screenshot

[v_pat]

Thanks for the help..though I didn't fix the problem through the new VI it gave me a few ideas and I was able to get my program up and running.

Thanks again