Hello, I was hoping someone could help me. This is my first posting and the first time I have programmed in Labview. I apologize if I am overlooking something simple. The manuals have gotten me this far, but now I am stuck. I wrote a program to record voltage (Keithley 2400-GPIB-address 26) and two temperature readings (J-KEM Gemini has 2 thermocouples - Serial RS232 - Addresses 24 and 25). The program works fine when I record the voltage and 1 temperature, but times out when I try to add the second temperature (I used a random number generator for the second temperature to confirm that the rest of the program was working). The program times out when I use the Instrument Assistant to capture the second temperature. "Error -1073807339 occurred at VISA Read in Instance 17 19SeebeckMeasurements .vi->SeebeckMeasurements.vi Possible reason(s):VISA: (Hex 0xBFFF0015) Timeout expired before operation completed." Attached is my program and the NISpy file. The manufacturer of the J-KEM temperature controller does not offer a device driver but gave me the following command to record temperature: "T(address)/r ". I am using the default settings of 18N1 and 9600 baud. I have the 3 Instrument Assistants set to time out after 3000 ms and I would like to record data every 200 ms Up to this point the NI manuals have been an excellent resource. I was hoping someone from the Forum can help me get over this hump. Thanks so much. Dave 1. VISA Set Attribute ("GPIB0::26::INSTR", TMO_VALUE, 3000)Process ID: 0x00000C98 Thread ID: 0x00000F34Start Time: 13:25:24.901 Call Duration: 00:00:00.015Status: 0 (VI_SUCCESS) 2. VISA Set Attribute ("COM1", TMO_VALUE, 3000)Process ID: 0x00000C98 Thread ID: 0x00000BF0Start Time: 13:37:58.191 Call Duration: 00:00:00.016Status: 0 (VI_SUCCESS) 3. VISA Set Attribute ("COM1", TMO_VALUE, 3000)Process ID: 0x00000C98 Thread ID: 0x000000F0Start Time: 13:37:58.207 Call Duration: 00:00:00.000Status: 0 (VI_SUCCESS) 4. VISA Set Attribute ("COM1", TERMCHAR, 13)Process ID: 0x00000C98 Thread ID: 0x000000F0Start Time: 13:37:58.207 Call Duration: 00:00:00.000Status: 0 (VI_SUCCESS) 5. VISA Set Attribute ("COM1", TERMCHAR_EN, 1)Process ID: 0x00000C98 Thread ID: 0x000000F0Start Time: 13:37:58.207 Call Duration: 00:00:00.000Status: 0 (VI_SUCCESS) 6. VISA Set Attribute ("COM1", TERMCHAR, 13)Process ID: 0x00000C98 Thread ID: 0x00000BF0Start Time: 13:37:58.207 Call Duration: 00:00:00.000Status: 0 (VI_SUCCESS)7. VISA Set Attribute ("COM1", TERMCHAR_EN, 1)Process ID: 0x00000C98 Thread ID: 0x00000BF0Start Time: 13:37:58.207 Call Duration: 00:00:00.000Status: 0 (VI_SUCCESS)8. VISA Set Attribute ("GPIB0::26::INSTR", TERMCHAR, 0)Process ID: 0x00000C98 Thread ID: 0x00000F34Start Time: 13:37:58.207 Call Duration: 00:00:00.000Status: 0 (VI_SUCCESS)9. VISA Set Attribute ("COM1", ASRL_END_IN, 2)Process ID: 0x00000C98 Thread ID: 0x000000F0Start Time: 13:37:58.207 Call Duration: 00:00:00.000Status: 0 (VI_SUCCESS)10. VISA Write ("COM1", "T(25).")Process ID: 0x00000C98 Thread ID: 0x000000F0Start Time: 13:37:58.207 Call Duration: 00:00:00.000Status: 0 (VI_SUCCESS)11. VISA Set Attribute ("COM1", ASRL_END_IN, 2)Process ID: 0x00000C98 Thread ID: 0x00000BF0Start Time: 13:37:58.207 Call Duration: 00:00:00.000Status: 0 (VI_SUCCESS)12. VISA Set Attribute ("GPIB0::26::INSTR", TERMCHAR_EN, 0)Process ID: 0x00000C98 Thread ID: 0x00000F34Start Time: 13:37:58.207 Call Duration: 00:00:00.000Status: 0 (VI_SUCCESS)13. VISA Write ("COM1", "T(24).")Process ID: 0x00000C98 Thread ID: 0x00000BF0Start Time: 13:37:58.207 Call Duration: 00:00:00.015Status: 0 (VI_SUCCESS)14. VISA Write ("GPIB0::26::INSTR", "READ?")Process ID: 0x00000C98 Thread ID: 0x00000F34Start Time: 13:37:58.207 Call Duration: 00:00:00.015Status: 0 (VI_SUCCESS) 15. VISA Read ("GPIB0::26::INSTR", 4096, "-4.509825E-04,+9.9100...")Process ID: 0x00000C98 Thread ID: 0x00000F34Start Time: 13:37:58.222 Call Duration: 00:00:00.063Status: 0 (VI_SUCCESS) 16. VISA Read ("COM1", 4096, "21.9.")Process ID: 0x00000C98 Thread ID: 0x000000F0Start Time: 13:37:58.222 Call Duration: 00:00:00.078Status: 0 (VI_SUCCESS) > 17. VISA Read ("COM1", 4096)> Process ID: 0x00000C98 Thread ID: 0x00000F34> Start Time: 13:37:58.300 Call Duration: 00:00:02.996> Status: 0xBFFF0015 (VI_ERROR_TMO)

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