Hi guys;
I am using one of these as the interface between belkins upsd daemon and the
ups, This particular one says its a radio shack model according to lsusb -v:
======
Bus 002 Device 003: ID 1453:4026 Radio Shack 26-183 Serial Cable
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x1453 Radio Shack
idProduct 0x4026 26-183 Serial Cable
bcdDevice 0.00
iManufacturer 0
iProduct 0
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 39
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x000a 1x 10 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
======, several years old now, and the cat of /proc/bus/usb/devices for it
looks like this:
T: Bus=02 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#= 3 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=1453 ProdID=4026 Rev= 0.00
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=pl2303
E: Ad=81(I) Atr=03(Int.) MxPS= 10 Ivl=1ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms
E: Ad=83(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
And no, that's not a paste error, it really does have 3 E:'s.
dmesg says this about it.
pl2303 2-2.1:1.0: pl2303 converter detected
usb 2-2.1: pl2303 converter now attached to ttyUSB0
usbcore: registered new interface driver pl2303
drivers/usb/serial/pl2303.c: Prolific PL2303 USB to serial adaptor driver
drivers/usb/serial/usb-serial.c: USB Serial support registered for FTDI USB
Serial Device
When it is being used to monitor the ups, it will fail to get the data
properly, 2 or 3 times a day, and the belkin upsd has this nasty habit of
throwing up a small screen on every screen running, or popping up its message
on all available shells with a -wall broadcast advising the whole world of
the disconnect, only to cancel it 2 seconds later when it starts getting good
data again. A right noxious PITA. And it can only talk to a full, 12mb/s
usb circuit, it is not even detected or initialized if its plugged into a
high speed (400mhz) hub.
The problem has the walk and quack of a type 2 pl2303 that I was able to find
a thread on that took place back in 2005, thanks to google.
Is this indeed a type 2 chip? Or enough of a clone of it to stumble like this
from time to time?
Are there any patches to fix this even pending at this late date? I could
play the canary easy enough and test them.
Thanks all.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
The greatest remedy for anger is delay.
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