[Libusb-devel] Communication to a multimeter

[Allann J. <all...@gm...>]

Hi, I trying to send and receive commands (SCPI commands) from a Agilent
34410A multimeter that has USB communication. But I'm having problems. When
using bulk messages the multimeter doesn't react. Is the bulk messages the
correct way to communicate with the multimeter? Currently I have a LAN
driver  that communicates with the multimeter but the performance is slow.

Some information:

[root@ajoliveira tst_multimeter_usb]# cat /proc/bus/usb/devices

T:  Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  7 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=0957 ProdID=0607 Rev= 1.00
S:  Manufacturer=Agilent Technologies
S:  Product=34410A Digital Multimeter
S:  SerialNumber=MY47001518
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr=  0mA
I:  If#= 0 Alt= 0 #EPs= 3 Cls=fe(app. ) Sub=03 Prot=01 Driver=(none)
E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=88(I) Atr=03(Int.) MxPS=   2 Ivl=125us


Thank you for any help.



-- 
_______________________________
Allann J. O. Silva

"I received the fundamentals of my education in school, but that was not
enough. My real education, the superstructure, the details, the true
architecture, I got out of the public library. For an impoverished child
whose family could not afford to buy books, the library was the open door to
wonder and achievement, and I can never be sufficiently grateful that I had
the wit to charge through that door and make the most of it." (from I.
Asimov, 1994)