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I have 2 of the normal Agilent E3646A power supplies and an Agilent GPIB/USB adapter.

All 3 devices have different GPIB addresses and the two supplies are connected together with a GPIB cable.

However, only the device works which is directly connected with the USB adapter.

I can connect to the other (it says "Remote Control" on the display as soon as I connect) but as soon as I send an SCPI command (e.g., RST) I get a timeout.

So, the connection works in principle but the communication not. Do I need to terminate the GPIB bus somehow? Can the cable be broken?

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  • \$\begingroup\$ What happens if you swap the positions of the devices, so that the “other” unit is the one which is directly connected? \$\endgroup\$ – Blair Fonville Jun 18 '18 at 1:17
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    \$\begingroup\$ Bad GPIB cable, perhaps? \$\endgroup\$ – alex.forencich Jun 18 '18 at 3:08
  • \$\begingroup\$ @BlairFonville: As I said "However, only the device works which is directly connected with the USB adapter." - so clearly I swapped them. \$\endgroup\$ – divB Jun 18 '18 at 7:35
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    \$\begingroup\$ No, saying that you have two devices in a chain and only the closest one works, does not make it clear that you have tried swapping them. But having now cleared that up, I would certainly agree that you need to try a new cable. \$\endgroup\$ – Blair Fonville Jun 18 '18 at 13:24
  • \$\begingroup\$ Yes, indeed, the GPIB cable was broken! Thanks for the ideas. \$\endgroup\$ – divB Jun 19 '18 at 1:22

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