I just bought a USB to Dual RS-232 cable that appears to integrate a USB
hub, and 2) PL2303 devices. Here's the link to the device:
http://www.coolgear.com/productdetails1.cfm?sku=USBG-2X232&catid=465,199&cats=
I started out just connecting the device to an available port on my machine
(Intel P4 with RHEL 3WS - 2.4.21-4.ELsmp) and the dmesg showed that it was
recognized as 2 seperate PL2303 devices, and each seemed to be
appropriately mapped to /dev/ttyUSB0 and /dev/ttyUSB1. I connected a dumb
terminal to the port, and simply tried an #echo Test > /dev/ttyUSB0. The
command seemed to hang, and never came back to the bash prompt.
I spent some time reading, and found a bunch of patches for 2.4.21, so I
downloaded the usb-2.4.21.patch.gz file, and applied the patch. However, I
still am experiencing the same results.
Here's the output of dmesg:
hub.c: new USB device 00:1d.3-1, assigned address 2
hub.c: USB hub found
hub.c: 4 ports detected
hub.c: new USB device 00:1d.3-1.2, assigned address 3
usb.c: USB device 3 (vend/prod 0x67b/0x2303) is not claimed by any active
driver.
hub.c: new USB device 00:1d.3-1.3, assigned address 4
usb.c: USB device 4 (vend/prod 0x67b/0x2303) is not claimed by any active
driver.
usb.c: registered new driver serial
usbserial.c: USB Serial support registered for Generic
usbserial.c: USB Serial Driver core v1.4
usbserial.c: USB Serial support registered for PL-2303
usbserial.c: PL-2303 converter detected
usbserial.c: PL-2303 converter now attached to ttyUSB0 (or usb/tts/0 for
devfs)
usbserial.c: PL-2303 converter detected
usbserial.c: PL-2303 converter now attached to ttyUSB1 (or usb/tts/1 for
devfs)
pl2303.c: Prolific PL2303 USB to serial adaptor driver v0.9
I tried lsusb -v and this is what showed up in dmesg:
usb-uhci.c: interrupt, status 2, frame# 386
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb_control/bulk_msg: timeout
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
usb.c: USB disconnect on device 00:1d.3-1.2 address 3
usbserial.c: PL-2303 converter now disconnected from ttyUSB0
usb.c: USB disconnect on device 00:1d.3-1.3 address 4
usbserial.c: PL-2303 converter now disconnected from ttyUSB1
usb_control/bulk_msg: timeout
inserting floppy driver for 2.4.21-4.ELsmp
usbdevfs: USBDEVFS_CONTROL failed dev 2 rqt 128 rq 6 len 256 ret -110
hub.c: new USB device 00:1d.3-1.2, assigned address 5
usbserial.c: PL-2303 converter detected
usbserial.c: PL-2303 converter now attached to ttyUSB0 (or usb/tts/0 for
devfs)
hub.c: new USB device 00:1d.3-1.3, assigned address 6
usbserial.c: PL-2303 converter detected
usbserial.c: PL-2303 converter now attached to ttyUSB1 (or usb/tts/1 for
devfs)
floppy0: no floppy controllers found
inserting floppy driver for 2.4.21-4.ELsmp
floppy0: no floppy controllers found
finally, this is the output of lsusb:
Bus 005 Device 001: ID 0000:0000
Bus 004 Device 001: ID 0000:0000
Bus 004 Device 002: ID 03eb:3301 Atmel Corp. 4-port Hub
Bus 004 Device 005: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial
Port
Bus 004 Device 006: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial
Port
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000
Can someone point me in the right direction to get this working?
Thank you,
Dan
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