SuiYan

回復 29# 角色


    原因. 我慳皮, 無用火牛去供電. 就咁放在raspberrypi隔離個mp3收音機取電. 那個收音機只有5v 500mA.

角色

用Tanscend的USB 3.0 HUB，就没有reboot的问题。

角色

Now the E1550 modem was able to access the internet via a Routerboard. It is expected that the modem functions corrrectly at least for the data part.

When I connected the USB modem with a powered USB hub, there was no /dev/ttyUSBx devices on the system. My question is do we need to install the chan_dongle first in order to see /dev/ttyUSBx.

角色

unlock:

http://trickmatrix.blogspot.hk/2 ... -update-driver.html

ckleea

回復 33# 角色
Yes if you find /dev/ttyUSBxx ports. But you can access via IMEI.

重點是 Linux kernel 見到 device 未？

角色

还没有看到/dev/ttyUSBx ports, 都不知道什么原因。

角色

还没有看到/dev/ttyUSBx ports, 都不知道什么原因。

不知道是否与我的rapbian image有关？是否有安装什么packages才可以detect到？

角色

原来之前已经有人说过这个问题。

http://www.raspberrypi.org/phpBB ... =32307&p=285871

角色

Finally I managed to get the device /dev/ttyUSB0 and /dev/ttyUSB1 by the following and important command:

apt-get install usb-modeswitch

角色

If I used the command lsusb, it gave

1. root@raspberrypi:~# lsusb
   
2. Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp.
   
3. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   
4. Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
   
5. Bus 001 Device 009: ID 8564:4000
   
6. Bus 001 Device 012: ID 12d1:1003 Huawei Technologies Co., Ltd. E220 HSDPA Modem / E230/E270/E870 HSDPA/HSUPA Modem
   
7. Bus 001 Device 010: ID 046d:c31d Logitech, Inc.

複製代碼

More modems it gives after having isntalled the usb-modeswitch package.

角色

When I checked the device /dev/ttyUSBX port, I got

1. root@raspberrypi:/dev# ls -l ttyU*
   
2. crw-rw---T 1 root dialout 188, 0 Oct 27 22:57 ttyUSB0
   
3. crw-rw---T 1 root dialout 188, 1 Oct 27 22:57 ttyUSB1

複製代碼

Qnewbie

Use 5V2A PSU for RPi+3G modem but it crashed...

角色

The above results I got were with a powered USB hub. If I plugged the modem directly in the Raspberry Pi box with a very good USB DC power of 2000mA, an interesting results were obtained.

1. root@raspberrypi:~# lsusb
   
2. Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp.
   
3. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   
4. Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
   
5. Bus 001 Device 004: ID 12d1:1446 Huawei Technologies Co., Ltd. E1552/E1800/E173 (HSPA modem)
   
6. root@raspberrypi:~# ls /dev/tty*
   
7. /dev/tty    /dev/tty19  /dev/tty3   /dev/tty40  /dev/tty51  /dev/tty62
   
8. /dev/tty0   /dev/tty2   /dev/tty30  /dev/tty41  /dev/tty52  /dev/tty63
   
9. /dev/tty1   /dev/tty20  /dev/tty31  /dev/tty42  /dev/tty53  /dev/tty7
   
10. /dev/tty10  /dev/tty21  /dev/tty32  /dev/tty43  /dev/tty54  /dev/tty8
    
11. /dev/tty11  /dev/tty22  /dev/tty33  /dev/tty44  /dev/tty55  /dev/tty9
    
12. /dev/tty12  /dev/tty23  /dev/tty34  /dev/tty45  /dev/tty56  /dev/ttyAMA0
    
13. /dev/tty13  /dev/tty24  /dev/tty35  /dev/tty46  /dev/tty57  /dev/ttyprintk
    
14. /dev/tty14  /dev/tty25  /dev/tty36  /dev/tty47  /dev/tty58
    
15. /dev/tty15  /dev/tty26  /dev/tty37  /dev/tty48  /dev/tty59
    
16. /dev/tty16  /dev/tty27  /dev/tty38  /dev/tty49  /dev/tty6
    
17. /dev/tty17  /dev/tty28  /dev/tty39  /dev/tty5   /dev/tty60
    
18. /dev/tty18  /dev/tty29  /dev/tty4   /dev/tty50  /dev/tty61
    
19. root@raspberrypi:~#

複製代碼

It is seen from the above results, the modem features using lsusb is different from the previous results that I got. Also the there was no /dev/ttyUSBX port.

角色

回復 42# Qnewbie

The reboot was due to the insufficient power to the USB port via the internal and limited power components. I have the same reboot result when it was powered by a 2000mA 5V USB power supply to my Raspberry Pi box.

If you switch to use a powered USB hub, the reboot issue will be gone away. Also you could get the correction information that you have including /dev/ttyUSBX.

角色

The next question may be the search of a low-powered 3G modem which could be easily powered up by general 500mA 5V supply.