communication with same instruments times out

2021-05-24T15:00:57.415000Z

Hi,

I installed linux gpib on Ubuntu 21.04 and installed and configured pyvisa etc.

ibtest is working and I can also use pyvisa and/or gpib. I have currently three devices hooked up.

2460 Source meter is working flawlessly: write and read and query works well.
I am having trouble with 2420 Source meter and SR844 Lockin. I can write and configure the instruments but the read and query time out. I have no idea why this is :/

Any suggestions how to resolve this issue?

ibtest for 2420:

enter maximum number of bytes to read [1024]: 1024
trying to read 1024 bytes from device...
received string: 'KEITHLEY INSTRUMENTS INC.,MODEL 24'
Number of bytes read: 34
gpib status is:
ibsta = 0xc100 < ERR TIMO CMPL >
iberr= 6
EABO 6: Operation aborted

ibtest for 2460:

enter maximum number of bytes to read [1024]: 1024
trying to read 1024 bytes from device...
received string: 'KEITHLEY INSTRUMENTS,MODEL 2460,04480133,1.7.3c
'
Number of bytes read: 48
gpib status is:
ibsta = 0x2100 < END CMPL >
iberr= 0

gpib.conf:

interface {
minor = 0
board_type = "ni_pci"
name = "gpib"
pad = 0
master = yes

/ base = 0
sad = 0
irq = 0
dma = 0
with and without does not matter /
}

device {
minor = 0
name = "PS1"
pad = 6

    eos = 0xa       /* EOS Byte */
    set-reos = no /* Terminate read if EOS */
    set-bin = no /* Compare EOS 8-bit */

}

device {
minor = 0
name = "SM1"
pad = 11

    eos = 0xa       /* EOS Byte */
    set-reos = no /* Terminate read if EOS */
    set-bin = no /* Compare EOS 8-bit */

}

device {
minor = 0
name = "LA1"
pad = 16

    eos = 0xa       /* EOS Byte */
    set-reos = no /* Terminate read if EOS */
    set-bin = no /* Compare EOS 8-bit */

}

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communication with same instruments times out