KIETHLEY KUSB-488B GPIB-USB  - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 18, 2015, 06:09:28 pm
content: I have a Keithley GPIB-USB KUSB-488B. When I plug it into the USB port, windows will not search for the driver and it will not show up in the Device manager. The active and ready lights are lit. Interesting when I plug it into a USB hub that's attached to the computer. The computer say unknown device. And in the Device manager it's shown as an unknown Device even with the drivers installed. Can anyone help out with this problem.ThanksR_G_B

author: PA0PBZ
author_rank: Super Contributor
timestamp: June 18, 2015, 06:25:20 pm
content: Did it ever work? Can you manually assign the driver when it is showing as an unknown device?

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 18, 2015, 06:35:52 pm
content: Quote from: PA0PBZ on June 18, 2015, 06:25:20 pmNo it does not work when you manually assign the driver just says the same thing.ThanksR_G_B

author: PA0PBZ
author_rank: Super Contributor
timestamp: June 18, 2015, 06:44:57 pm
content: Did it ever work?What is the PID/VID of the unknown device?

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 18, 2015, 07:12:39 pm
content: looks like I am not the only one with this problem:http://forum.keithley.com/phpBB3/viewtopic.php?f=84&t=3504R_G_B_

author: VintageNut
author_rank: Frequent Contributor
timestamp: June 18, 2015, 07:51:06 pm
content: Install the latest Keithley I/O layer. Use Keithley communicator to try to send individual commands to your instrument.I have two of the KUSB-488B and use them on two different computers running Windows 7.

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 18, 2015, 07:57:29 pm
content: Quote from: VintageNut on June 18, 2015, 07:51:06 pmVintageNutWhen i plug it straight into the laptop usb port nothing happens Nothing at all. When i plug it in to the lap to via a usb hub it say unknown device...would you know why this is?R_G_B

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 18, 2015, 08:20:24 pm
content: The I/O layer will not install.R_G_B

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 18, 2015, 08:36:28 pm
content: I/O layer installed and the drivers are installed. Still nothing happening?What next.ThanksR_G_B_

author: VintageNut
author_rank: Frequent Contributor
timestamp: June 18, 2015, 09:51:19 pm
content: Quote from: R_G_B_ on June 18, 2015, 08:36:28 pmDoes the light READY illumine when it is plugged in?

author: VintageNut
author_rank: Frequent Contributor
timestamp: June 18, 2015, 09:56:39 pm
content: I just plugged one of mine in. When you plug it in, the ACTIVE light comes on orange/red, the computer says some stuff about USB, when the USB computer message goes away, the ACTIVE light goes off and the READY light comes on green.

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 18, 2015, 10:07:33 pm
content: Quote from: VintageNut on June 18, 2015, 09:56:39 pmThe red and green lights are always on when you plug it into the computer nothing at all happens the computer will not search for the driver and does nothing.

author: VintageNut
author_rank: Frequent Contributor
timestamp: June 19, 2015, 12:11:29 am
content: Some of the latest NI drivers only work with NI adapters. Uninstalling all GPIB/VISA drivers and then only re-install the Keithley I/O layer may fix the problem.

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 19, 2015, 05:50:06 am
content: Looks like the KUSB-488B is not working. The RED active and GREEN ready are always on at the same time no flashing just constantly lit up. The computer will do nothing.R_G_B

author: cncjerry
author_rank: Unknown
timestamp: June 19, 2015, 06:10:02 am
content: Is it a powered hub? If not, the hub might not have the juice to power the unit causing a different error. Maybe the laptop doesn't have the juice either but unlikely. My Surface Pro 3 can power the agilent USB -> GPIB. Sounds to me like the device/ID/PID whatever is wrong in the driver description file (can't remember the exact name). It is a text file and I've been successful before getting the enumeration data out of device manager, modifying the driver description and getting things to load.

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 19, 2015, 06:56:47 am
content: Quote from: cncjerry on June 19, 2015, 06:10:02 amI have tried it on a PC and a laptop. It will only give the unknown device error when plugged in through a USB hub on both the PC or Laptop. Also the USB hub is powered by the PC or laptop USB ports.The LED lite on the active and ready are constantly lit. when you plug it in it does not search for a driver unless its plugged in through a hub which seems very strange. I don't think its working?

author: cncjerry
author_rank: Unknown
timestamp: June 19, 2015, 07:01:30 am
content: Are you seeing a device in device manager? Does it give you the PID and other info under properties or setting, can't remember what the drop down is called? Did you try right clicking and selecting update driver then point to the directory where the drivers are saved?

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 19, 2015, 07:04:42 am
content: Quote from: cncjerry on June 19, 2015, 07:01:30 amNo nothing at all

author: cncjerry
author_rank: Unknown
timestamp: June 19, 2015, 07:10:00 am
content: I don't know, the hub might be signalling the computer somehow just due to current drain. If you don't see it plugged in directly I would think it is suspect. They all are based on one or the other with the agilent being copied a lot. That has a power and ready light and I don't remember seeing the ready light until it is operating and communicating. I guess you don't have another computer to try?

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 19, 2015, 07:19:55 am
content: Quote from: cncjerry on June 19, 2015, 07:10:00 amIts not working i think its malfunctioned in some way.i tried it on three computers and different OS. nothing.

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 19, 2015, 07:42:29 am
content: scoping the output pins see if anything but have no reference anyone help?

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 19, 2015, 07:57:42 am
content: Interesting ... when scoping the pins they are between 3.14V and 3V.When connecting it through a hub the voltage drops to between 2.688V and 2.7V. Then i get the unknown USB device error.

author: cncjerry
author_rank: Unknown
timestamp: June 19, 2015, 08:43:02 pm
content: Plug it into whatever gives you the unknown device error. I would use a powered hub.Once you have the unknown device, go into devicemangler, click on the details tab and you will see a drop down labeled "property'. There should be a number of entries in that drop down. Hit the drop down and post a screen shot.Once you have the drop down, select the item labeled "Hardware Ids". You should see something like the following:USB\VID_0957&PID_0718&REV_0000USB\VID_0957&PID_0718Post what you see.

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 20, 2015, 08:40:24 am
content: I called Kiethley they said its broken. They told me to get a GPIB adapter from National instruments instead.